19
Example Streams Replication Environments

This chapter illustrates some of the replication environments that can be constructed using Streams.

This chapter contains these topics:

Single Source Database in a Heterogeneous Environment

This example illustrates using Streams to replicate data between four databases. The environment is heterogeneous because three of the databases are Oracle databases and one is a Sybase database. DML and DDL changes made to tables in the hr schema at the dbs1.net Oracle database are captured and propagated to the other two Oracle databases. Only DML changes are captured and propagated to the dbs4.net database, because an apply process cannot apply DDL changes to a non-Oracle database. Changes to the hr schema occur only at dbs1.net. The hr schema is read-only at the other databases in the environment.

This example contains these parts:

"Setting Up Users and Creating Queues and Database Links"
"Example Scripts for Sharing Data from One Database". This part illustrates two different example scripts that accomplish the same task:
- "Simple Configuration for Sharing Data from a Single Database"
- "Flexible Configuration for Sharing Data from a Single Database"
"Adding Objects to an Existing Streams Replication Environment"
"Adding a Database to an Existing Streams Replication Environment"

Figure 19-1 provides an overview of the environment.

Figure 19-1 Example Environment That Shares Data from a Single Source Database

Text description of strms002.gif follows

Text description of the illustration strms002.gif

As illustrated in Figure 19-1, dbs1.net contains the following tables in the hr schema:

countries
departments
employees
job_history
jobs
locations
regions

This example uses directed networks, which means that captured changes at a source database are propagated to another database through one or more intermediate databases. Here, the dbs1.net database propagates changes to the dbs3.net database through the intermediate database dbs2.net. Also, the dbs1.net database propagates changes to the dbs2.net database, which applies the changes directly to the dbs4.net database through a gateway.

Some of the databases in the environment do not have certain tables. If the database is not an intermediate database for a table and the database does not contain the table, then changes to the table do not need to be propagated to that database. For example, the departments, employees, job_history, and jobs tables do not exist at dbs3.net. Therefore, dbs2.net does not propagate changes to these tables to dbs3.net.

In this example, Streams is used to perform the following series of actions:

The capture process captures DML and DDL changes for all of the tables in the hr schema and enqueues them into a queue at the dbs1.net database. In this example, changes to only four of the seven tables are propagated to destination databases, but in the example that illustrates "Adding Objects to an Existing Streams Replication Environment", the remaining tables in the hr schema are added to a destination database.
The dbs1.net database propagates these changes in the form of messages to a queue at dbs2.net.
At dbs2.net, DML changes to the jobs table are transformed into DML changes for the assignments table (which is a direct mapping of jobs) and then applied. Changes to other tables in the hr schema are not applied at dbs2.net.
Because the queue at dbs3.net receives changes from the queue at dbs2.net that originated in countries, locations, and regions tables at dbs1.net, these changes are propagated from dbs2.net to dbs3.net. This configuration is an example of directed networks.
The apply process at dbs3.net applies changes to the countries, locations, and regions tables.
Because dbs4.net, a Sybase database, receives changes from the queue at dbs2.net to the jobs table that originated at dbs1.net, these changes are applied remotely from dbs2.net using the dbs4.net database link through a gateway. This configuration is an example of heterogeneous support.

Prerequisites

The following prerequisites must be completed before you begin the example in this section.

Set the following initialization parameters to the values indicated for all databases in the environment:
- GLOBAL_NAMES: This parameter must be set to true at each database that is participating in your Streams environment.
- JOB_QUEUE_PROCESSES: This parameter must be set to at least 2 at each database that is propagating events in your Streams environment. It should be set to the same value as the maximum number of jobs that can run simultaneously plus one. In this example, dbs1.net and dbs2.net propagate events. So, JOB_QUEUE_PROCESSES must be set to at least 2 at these databases.
- COMPATIBLE: This parameter must be set to 9.2.0 or higher.
- LOG_PARALLELISM: This parameter must be set to 1 at each database that captures events. In this example, this parameter must be set to 1 at dbs1.net.
  
  See Also:
  "Setting Initialization Parameters Relevant to Streams" for information about other initialization parameters that are important in a Streams environment
Any database where changes are captured must be running in ARCHIVELOG mode. In this example, changes are captured at dbs1.net, and so dbs1.net must be running in ARCHIVELOG mode.

See Also:
Oracle9i Database Administrator's Guide for information about running a database in ARCHIVELOG mode
Configure an Oracle gateway on dbs2.net to communicate with the Sybase database dbs4.net.

See Also:
Oracle9i Heterogeneous Connectivity Administrator's Guide
At the Sybase database dbs4.net, set up the hr user and create the jobs table. The table shape should match the jobs table on dbs1.net.

See Also:
Your Sybase documentation for information about creating users and tables in your Sybase database
At the Sybase database dbs4.net, add data to the jobs table to make it consistent with the jobs table at the Oracle database dbs1.net. Record the SCN that corresponds to the point in time when the data was copied from the dbs1.net database to the dbs4.net database.
See Also:

Oracle9i Heterogeneous Connectivity Administrator's Guide

Your Sybase documentation for information about inserting data into tables in your Sybase database
Configure your network and Oracle Net so that the following databases can communicate with each other:
- dbs1.net and dbs2.net
- dbs2.net and dbs3.net
- dbs2.net and dbs4.net
  
  See Also:
  Oracle9i Net Services Administrator's Guide
This examples creates a new user to function as the Streams administrator (strmadmin) at each database and prompts you for the tablespace you want to use for this user's data. Before you start this example, either create a new tablespace or identify an existing tablespace for the Streams administrator to use at each database. The Streams administrator should not use the SYSTEM tablespace.

Setting Up Users and Creating Queues and Database Links

Complete the following steps to set up users and create queues and database links for a Streams replication environment that includes three Oracle databases and one Sybase database.

Note:

If you are viewing this document online, then you can copy the text from the "BEGINNING OF SCRIPT" line on this page to the next "END OF SCRIPT" line into a text editor and then edit the text to create a script for your environment. Run the script with SQL*Plus on a computer that can connect to all of the databases in the environment.

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_setup_single.out

/*

Step 2 Alter the hr.countries Table at dbs1.net

Connect to dbs1.net as the hr user.

*/
 
CONNECT hr/hr@dbs1.net

/*

Convert the hr.countries table from an index-organized table to a regular table. Currently, the capture process cannot capture changes to index-organized tables.

*/
 
ALTER TABLE countries RENAME TO countries_orig;

CREATE TABLE hr.countries( 
  country_id      CHAR(2) CONSTRAINT  country_id_nn_noiot NOT NULL, 
  country_name    VARCHAR2(40), 
  region_id       NUMBER, 
  CONSTRAINT      country_c_id_pk_noiot  PRIMARY KEY (country_id)); 

ALTER TABLE hr.countries
ADD (CONSTRAINT countr_reg_fk_noiot
             FOREIGN KEY (region_id)
         REFERENCES regions(region_id)) ;
    
INSERT INTO COUNTRIES (SELECT * FROM hr.countries_orig);

ALTER TABLE locations DROP CONSTRAINT loc_c_id_fk;

ALTER TABLE locations
  ADD (CONSTRAINT loc_c_id_fk
    FOREIGN KEY (country_id)
    REFERENCES countries(country_id));

/*

Step 3 Set Up Users at dbs1.net

Connect to dbs1.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@dbs1.net AS SYSDBA

/*

Create the Streams administrator named strmadmin and grant this user the necessary privileges. These privileges enable the user to manage queues, execute subprograms in packages related to Streams, create rule sets, create rules, and monitor the Streams environment by querying data dictionary views and queue tables. You may choose a different name for this user.

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/

GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
dbs1.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_FLASHBACK        TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 4 Create the Streams Queue at dbs1.net

Connect as the Streams administrator at the database where you want to capture changes. In this example, that database is dbs1.net.

*/

CONNECT strmadmin/strmadminpw@dbs1.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at dbs1.net. This queue will function as the Streams queue by holding the captured changes that will be propagated to other databases.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 5 Create the Database Link at dbs1.net

Create the database link from the database where changes are captured to the database where changes are propagated. In this example, the database where changes are captured is dbs1.net, and these changes are propagated to dbs2.net.

*/

CREATE DATABASE LINK dbs2.net CONNECT TO strmadmin IDENTIFIED BY strmadminpw 
   USING 'dbs2.net';

/*

Step 6 Set Up Users at dbs2.net

Connect to dbs2.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@dbs2.net AS SYSDBA

/*

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/
 
GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
dbs2.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 7 Create the Streams Queue at dbs2.net

Connect as the Streams administrator at dbs2.net.

*/

CONNECT strmadmin/strmadminpw@dbs2.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at dbs2.net. This queue will function as the Streams queue by holding the changes that will be applied at this database and the changes that will be propagated to other databases.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC  DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 8 Create the Database Links at dbs2.net

Create the database links to the databases where changes are propagated. In this example, database dbs2.net propagates changes to dbs3.net, which is another Oracle database, and to dbs4.net, which is a Sybase database. Notice that the database link to the Sybase database connects to the owner of the tables, not to the Streams administrator. This database link can connect to any user at dbs4.net that has privileges to change the hr.jobs table at that database.

Note:

On some non-Oracle databases, including Sybase, you must ensure that the characters in the username and password are in the correct case. Therefore, double quotation marks are specified for the username and password at the Sybase database.

*/

CREATE DATABASE LINK dbs3.net CONNECT TO strmadmin IDENTIFIED BY strmadminpw 
   USING 'dbs3.net';

CREATE DATABASE LINK dbs4.net CONNECT TO "hr" IDENTIFIED BY "hrpass" 
   USING 'dbs4.net';

/*

Step 9 Create the hr.assignments Table at dbs2.net

This example illustrates a transformation in which changes to the hr.jobs table at dbs1.net are transformed into changes to the hr.assignments table at dbs2.net. You must create the hr.assignments table on dbs2.net for the transformation portion of this example to work properly.

Connect as hr at dbs2.net.

*/

CONNECT hr/hr@dbs2.net

/*

Create the hr.assignments table in the dbs2.net database.

*/

CREATE TABLE hr.assignments AS SELECT * FROM hr.jobs;

ALTER TABLE hr.assignments ADD PRIMARY KEY (job_id);

/*

Step 10 Set Up Users at dbs3.net

Connect to dbs3.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@dbs3.net AS SYSDBA

/*

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/
 
GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
dbs3.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 11 Create the Streams Queue at dbs3.net

Connect as the Streams administrator at dbs3.net.

*/

CONNECT strmadmin/strmadminpw@dbs3.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at dbs3.net. This queue will function as the Streams queue by holding the changes that will be applied at this database.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC  DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 12 Drop All of the Tables in the hr Schema at dbs3.net

This example illustrates instantiating tables in the hr schema by exporting them from dbs1.net and importing them into dbs3.net. You must delete these tables at dbs3.net for the instantiation portion of this example to work properly.

Connect as hr at dbs3.net.

*/

CONNECT hr/hr@dbs3.net

/*

Drop all tables in the hr schema in the dbs3.net database.

Attention:

If you complete this step and drop all of the tables in the hr schema, then you should complete the remaining sections of this example to reinstantiate the hr schema at dbs3.net. If the hr schema does not exist in an Oracle database, then some examples in the Oracle documentation set may fail.

*/

DROP TABLE hr.countries CASCADE CONSTRAINTS;
DROP TABLE hr.departments CASCADE CONSTRAINTS;
DROP TABLE hr.employees CASCADE CONSTRAINTS;
DROP TABLE hr.job_history CASCADE CONSTRAINTS;
DROP TABLE hr.jobs CASCADE CONSTRAINTS;
DROP TABLE hr.locations CASCADE CONSTRAINTS;
DROP TABLE hr.regions CASCADE CONSTRAINTS;

/*

Step 13 Check the Spool Results

Check the streams_setup_single.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

Example Scripts for Sharing Data from One Database

This example illustrates two ways to accomplish the replication of the tables in the hr schema using Streams.

"Simple Configuration for Sharing Data from a Single Database" demonstrates a simple way to configure the environment. This example uses the DBMS_STREAMS_ADM package to create a capture process, propagation jobs, and apply processes, as well as the rule sets associated with these processes and jobs. Using the DBMS_STREAMS_ADM package is the simplest way to configure a Streams environment.

"Flexible Configuration for Sharing Data from a Single Database" demonstrates a more flexible way to configure this environment. This example uses the DBMS_CAPTURE_ADM package to create a capture process, the DBMS_PROPAGATION_ADM package to create propagation jobs, and the DBMS_APPLY_ADM package to create apply processes. Also, this example uses the DBMS_RULES_ADM package to create and populate the rule sets associated with these processes and jobs. Using these packages, instead of the DBMS_STREAMS_ADM package, provides more configuration options and flexibility.

Note:

These examples illustrate two different ways to configure the same Streams environment. Therefore, you should run only one of the examples for a particular distributed database system. Otherwise, errors stating that objects already exist will result.

Simple Configuration for Sharing Data from a Single Database

Complete the following steps to specify the capture, propagation, and apply definitions using primarily the DBMS_STEAMS_ADM package.

Note:

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_share_schema1.out

/*

Step 2 Create an Alternate Tablespace for the LogMiner Tables at dbs1.net

By default, the LogMiner tables are in the SYSTEM tablespace, but the SYSTEM tablespace may not have enough space for these tables once a capture process starts to capture changes. Therefore, you must create an alternate tablespace for the LogMiner tables.

Connect to dbs1.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@dbs1.net AS SYSDBA

/*

Create an alternate tablespace for the LogMiner tables.

Note:

Each ACCEPT command must appear on a single line in the script.

*/

ACCEPT tspace_name DEFAULT 'logmnrts' PROMPT 'Enter the name of the tablespace 
(for example, logmnrts): '

ACCEPT db_file_directory DEFAULT '' PROMPT 'Enter the complete path to the 
datafile directory (for example, /usr/oracle/dbs): '

ACCEPT db_file_name DEFAULT 'logmnrts.dbf' PROMPT 'Enter the name of the 
datafile (for example, logmnrts.dbf): '

CREATE TABLESPACE &tspace_name DATAFILE '&db_file_directory/&db_file_name' 
  SIZE 25 M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
   
EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('&tspace_name');

/*

Step 3 Specify Supplemental Logging at dbs1.net

Supplemental logging places additional information in the redo log for changes made to tables. The apply process needs this extra information to perform certain operations, such as unique row identification and conflict resolution. Because dbs1.net is the only database where changes are captured in this environment, it is the only database where you must specify supplemental logging for the tables in the hr schema.

Specify an unconditional supplemental log group for all primary key columns in the hr schema.

See Also:

*/

ALTER TABLE hr.countries ADD SUPPLEMENTAL LOG GROUP log_group_countries_pk
  (country_id) ALWAYS;

ALTER TABLE hr.departments ADD SUPPLEMENTAL LOG GROUP log_group_departments_pk
  (department_id) ALWAYS;

ALTER TABLE hr.employees ADD SUPPLEMENTAL LOG GROUP log_group_employees_pk
  (employee_id) ALWAYS;

ALTER TABLE hr.jobs ADD SUPPLEMENTAL LOG GROUP log_group_jobs_pk
  (job_id) ALWAYS;

ALTER TABLE hr.job_history ADD SUPPLEMENTAL LOG GROUP log_group_job_history_pk
  (employee_id, start_date) ALWAYS;

ALTER TABLE hr.locations ADD SUPPLEMENTAL LOG GROUP log_group_locations_pk
  (location_id) ALWAYS;

ALTER TABLE hr.regions ADD SUPPLEMENTAL LOG GROUP log_group_regions_pk
  (region_id) ALWAYS;

ALTER SYSTEM ARCHIVE LOG CURRENT;

/*

Step 4 Configure Propagation at dbs1.net

Connect to dbs1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs1.net

/*

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at dbs1.net to the queue at dbs2.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name             => 'hr', 
    streams_name            => 'dbs1_to_dbs2', 
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs2.net',
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

/*

Step 5 Configure the Capture Process at dbs1.net

Configure the capture process to capture changes to the entire hr schema at dbs1.net. This step specifies that changes to the tables in the specified schema are captured by the capture process and enqueued into the specified queue.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name    => 'hr',   
    streams_type   => 'capture',
    streams_name   => 'capture',
    queue_name     => 'strmadmin.streams_queue',
    include_dml    =>  true,
    include_ddl    =>  true);
END;
/

/*

Step 6 Set the Instantiation SCN for the Existing Tables at Other Databases

In this example, the hr.jobs table already exists at dbs2.net and dbs4.net. At dbs2.net, this table is named assignments, but it has the same shape and data as the jobs table at dbs1.net. Also, in this example, dbs4.net is a Sybase database. All of the other tables in the Streams environment are instantiated at the other databases using Export/Import.

Because the hr.jobs table already exists at dbs2.net and dbs4.net, this example uses the GET_SYSTEM_CHANGE_NUMBER function in the DBMS_FLASHBACK package at dbs1.net to obtain the current SCN for the database. This SCN is used at dbs2.net to run the SET_TABLE_INSTANTIATION_SCN procedure in the DBMS_APPLY_ADM package. Running this procedure twice sets the instantiation SCN for the hr.jobs table at dbs2.net and dbs4.net.

The SET_TABLE_INSTANTIATION_SCN procedure controls which LCRs for a table are ignored by an apply process and which LCRs for a table are applied by an apply process. If the commit SCN of an LCR for a table from a source database is less than or equal to the instantiation SCN for that table at a destination database, then the apply process at the destination database discards the LCR. Otherwise, the apply process applies the LCR.

In this example, both of the apply processes at dbs2.net will apply transactions to the hr.jobs table with SCNs that were committed after SCN obtained in this step.

Note:

This example assumes that the contents of the hr.jobs table at dbs1.net, dbs2.net (as hr.assignments), and dbs4.net are consistent when you complete this step. You may want to lock the table at each database while you complete this step to ensure consistency.

*/

DECLARE
  iscn  NUMBER;         -- Variable to hold instantiation SCN value
BEGIN
  iscn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();
  DBMS_APPLY_ADM.SET_TABLE_INSTANTIATION_SCN@DBS2.NET(
    source_object_name    => 'hr.jobs',
    source_database_name  => 'dbs1.net',
    instantiation_scn     => iscn);
  DBMS_APPLY_ADM.SET_TABLE_INSTANTIATION_SCN@DBS2.NET(
    source_object_name    => 'hr.jobs',
    source_database_name  => 'dbs1.net',
    instantiation_scn     => iscn,
    apply_database_link   =>     'dbs4.net');
END;
/

Step 7 Instantiate the dbs1.net Tables at dbs3.net

Open a different window and export the tables at dbs1.net that will be instantiated at dbs3.net. Make sure you set the OBJECT_CONSISTENT export parameter to y when you run the export command. Also, make sure no DDL changes are made to the objects being exported during the export.

The following is an example export command:

exp userid=hr/hr FILE=hr_instant1.dmp TABLES=countries,locations,regions 
OBJECT_CONSISTENT=y

See Also:

Oracle9i Database Utilities for information about performing an export

*/ 

PAUSE Press <RETURN> to continue when the export is complete in the other window 
that you opened.

/*

Transfer the export dump file hr_instant1.dmp to the destination database. In this example, the destination database is dbs3.net.

You can use binary FTP or some other method to transfer the export dump file to the destination database. You may need to open a different window to transfer the file.

*/

PAUSE Press <RETURN> to continue after transferring the dump file. 

/*

In a different window, connect to the computer that runs the dbs3.net database and import the export dump file hr_instant1.dmp to instantiate the countries, locations, and regions tables in the dbs3.net database. You can use telnet or remote login to connect to the computer that runs dbs3.net.

When you run the import command, make sure you set the STREAMS_INSTANTIATION import parameter to y. This parameter ensures that the import records export SCN information for each object imported.

The following is an example import command:

imp userid=hr/hr FILE=hr_instant1.dmp IGNORE=y FULL=y COMMIT=y LOG=import.log 
STREAMS_INSTANTIATION=y

See Also:

Oracle9i Database Utilities for information about performing an import

*/

PAUSE Press <RETURN> to continue after the import is complete at dbs3.net. 

/*

Step 8 Configure the Apply Process at dbs3.net

Connect to dbs3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs3.net

/*

Configure dbs3.net to apply changes to the countries table, locations table, and regions table.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.countries',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.locations',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.regions',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

/*

Step 9 Specify hr as the Apply User for the Apply Process at dbs3.net

In this example, the hr user owns all of the database objects for which changes are applied by the apply process at this database. Therefore, hr already has the necessary privileges to change these database objects, and it is convenient to make hr the apply user.

When the apply process was created in the previous step, the Streams administrator strmadmin was specified as the apply user by default, because strmadmin ran the procedure that created the apply process. Instead of specifying hr as the apply user, you could retain strmadmin as the apply user, but then you must grant strmadmin privileges on all of the database objects for which changes are applied and privileges to execute all user procedures used by the apply process. In an environment where an apply process applies changes to database objects in multiple schemas, it may be more convenient to use the Streams administrator as the apply user.

See Also:

"Configuring a Streams Administrator"

*/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply',
    apply_user => 'hr');
END;
/

/*

Step 10 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by the apply process

*/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

/*

Step 11 Start the Apply Process at dbs3.net

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start the apply process at dbs3.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/
 
BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply');
END;
/

/*

Step 12 Configure Propagation at dbs2.net

Connect to dbs2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs2.net

/*

Configure and schedule propagation from the queue at dbs2.net to the queue at dbs3.net. You must specify this propagation for each table that will apply changes at dbs3.net. This configuration is an example of directed networks because the changes at dbs2.net originated at dbs1.net.

*/
 
BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name               => 'hr.countries',
    streams_name             => 'dbs2_to_dbs3',
    source_queue_name        => 'strmadmin.streams_queue',
    destination_queue_name   => 'strmadmin.streams_queue@dbs3.net', 
    include_dml              =>  true,
    include_ddl              =>  true,
    source_database          => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name              => 'hr.locations',
    streams_name            => 'dbs2_to_dbs3',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs3.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name              => 'hr.regions',
    streams_name            => 'dbs2_to_dbs3',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs3.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

/*

Step 13 Create the Transformation for Row LCRs at dbs2.net

Connect to dbs2.net as the hr user.

*/
 
CONNECT hr/hr@dbs2.net

/*

Create the transformation function that transforms row changes resulting from DML statements to the jobs table from dbs1.net into row changes to the assignments table on dbs2.net.

The following function transforms every row LCR for the jobs table into a row LCR for the assignments table.

Note:

If DDL changes were also applied to the assignments table, then another transformation would be required for the DDL LCRs. This transformation would need to change the object name and the DDL text.

*/

CREATE OR REPLACE FUNCTION hr.to_assignments_trans_dml(
  p_in_data in SYS.AnyData) 
  RETURN SYS.AnyData IS out_data SYS.LCR$_ROW_RECORD;
  tc   pls_integer;
BEGIN
  -- Typecast AnyData to LCR$_ROW_RECORD
     tc := p_in_data.GetObject(out_data);
     IF out_data.get_object_name() = 'JOBS'
     THEN
  -- Transform the in_data into the out_data
     out_data.set_object_name('ASSIGNMENTS');
     END IF;
  -- Convert to AnyData
     RETURN SYS.AnyData.ConvertObject(out_data);
END;
/

/*

Step 14 Configure the Apply Process for Local Apply at dbs2.net

Connect to dbs2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs2.net

/*

Configure dbs2.net to apply changes to the assignments table. Remember that the assignments table receives changes from the jobs table at dbs1.net.

*/

DECLARE
  to_assignments_rulename_dml   VARCHAR2(30);
  dummy_rule                    VARCHAR2(30);
  action_ctx_dml                SYS.RE$NV_LIST;
  ac_name                       VARCHAR2(30) := 'STREAMS$_TRANSFORM_FUNCTION';
BEGIN
--  DML changes to the jobs table from dbs1.net are applied to the assignments 
--  table. The to_assignments_rulename_dml variable is an out parameter 
--  in this call.
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.jobs', -- jobs, not assignments, specified
    streams_type    => 'apply', 
    streams_name    => 'apply_dbs2',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     => true,
    include_ddl     => false,
    source_database => 'dbs1.net',
    dml_rule_name   => to_assignments_rulename_dml,
    ddl_rule_name   => dummy_rule); 
-- Specify the name-value pair in the action context
  action_ctx_dml := SYS.RE$NV_LIST(SYS.RE$NV_ARRAY());
  action_ctx_dml.ADD_PAIR(
    ac_name, 
    SYS.ANYDATA.CONVERTVARCHAR2('hr.to_assignments_trans_dml'));
--  Modify the rule for jobs to use the transformation.
  DBMS_RULE_ADM.ALTER_RULE(
    rule_name        => to_assignments_rulename_dml,
    action_context   => action_ctx_dml);
END;
/

/*

Step 15 Specify hr as the Apply User for the Apply Process at dbs2.net

See Also:

"Configuring a Streams Administrator"

*/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_dbs2',
    apply_user => 'hr');
END;
/

/*

Step 16 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by the apply process

*/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_DBS2';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

/*

Step 17 Start the Apply Process at dbs2.net for Local Apply

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start the apply process for local apply at dbs2.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_dbs2', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/
 
BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_dbs2');
END;
/

/*

Step 18 Configure the Apply Process at dbs2.net for Apply at dbs4.net

Configure the apply process for dbs4.net, which is a Sybase database. The dbs2.net database is acting as a gateway to dbs4.net. Therefore, the apply process for dbs4.net must be configured at dbs2.net. The apply process cannot apply DDL changes to non-Oracle databases. Therefore, the include_ddl parameter is set to false when the ADD_TABLE_RULES procedure is run.

*/

BEGIN
  DBMS_APPLY_ADM.CREATE_APPLY(
    queue_name          => 'strmadmin.streams_queue',
    apply_name          => 'apply_dbs4',
    apply_database_link => 'dbs4.net',
    apply_captured      => true);
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.jobs',
    streams_type    => 'apply', 
    streams_name    => 'apply_dbs4',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  false,
    source_database => 'dbs1.net');
END;
/

/*

Step 19 Start the Apply Process at dbs2.net for Apply at dbs4.net

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start the remote apply for Sybase using database link dbs4.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_dbs4', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/
 
BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_dbs4');
END;
/

/*

Step 20 Start the Capture Process at dbs1.net

Connect to dbs1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs1.net

/*

Start the capture process at dbs1.net.

*/

BEGIN
  DBMS_CAPTURE_ADM.START_CAPTURE(
    capture_name  => 'capture');
END;
/

/*

Step 21 Check the Spool Results

Check the streams_share_schema1.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

Flexible Configuration for Sharing Data from a Single Database

Complete the following steps to use a more flexible approach for specifying the capture, propagation, and apply definitions. This approach does not use the DBMS_STREAMS_ADM package. Instead, it uses the following packages:

The DBMS_CAPTURE_ADM package to configure capture processes
The DBMS_PROPAGATION_ADM package to configure propagation jobs
The DBMS_APPLY_ADM package to configure apply processes

The DBMS_RULES_ADM package to specify capture, propagation, and apply rules and rule sets

Note:

Neither the ALL_STREAMS_TABLE_RULES nor the DBA_STREAMS_TABLE_RULES data dictionary view is populated by the rules created in this example. To view the rules created in this example, you must query the ALL_RULES, DBA_RULES, or USER_RULES data dictionary view.

This example includes the following steps:

Note:

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_share_schema2.out

/*

Step 2 Create an Alternate Tablespace for the LogMiner Tables at dbs1.net

Connect to dbs1.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@dbs1.net AS SYSDBA

/*

Create an alternate tablespace for the LogMiner tables.

Note:

Each ACCEPT command must appear on a single line in the script.

*/

ACCEPT tspace_name DEFAULT 'logmnrts' PROMPT 'Enter the name of the tablespace 
(for example, logmnrts): '

ACCEPT db_file_directory DEFAULT '' PROMPT 'Enter the complete path to the 
datafile directory (for example, /usr/oracle/dbs): '

ACCEPT db_file_name DEFAULT 'logmnrts.dbf' PROMPT 'Enter the name of the 
datafile (for example, logmnrts.dbf): '

CREATE TABLESPACE &tspace_name DATAFILE '&db_file_directory/&db_file_name' 
  SIZE 25 M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
   
EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('&tspace_name');

/*

Step 3 Specify Supplemental Logging at dbs1.net

Specify an unconditional supplemental log group for all primary key columns in the hr schema.

See Also:

*/

ALTER TABLE hr.countries ADD SUPPLEMENTAL LOG GROUP log_group_countries_pk
  (country_id) ALWAYS;

ALTER TABLE hr.departments ADD SUPPLEMENTAL LOG GROUP log_group_departments_pk
  (department_id) ALWAYS;

ALTER TABLE hr.employees ADD SUPPLEMENTAL LOG GROUP log_group_employees_pk
  (employee_id) ALWAYS;

ALTER TABLE hr.jobs ADD SUPPLEMENTAL LOG GROUP log_group_jobs_pk
  (job_id) ALWAYS;

ALTER TABLE hr.job_history ADD SUPPLEMENTAL LOG GROUP log_group_job_history_pk
  (employee_id, start_date) ALWAYS;

ALTER TABLE hr.locations ADD SUPPLEMENTAL LOG GROUP log_group_locations_pk
  (location_id) ALWAYS;

ALTER TABLE hr.regions ADD SUPPLEMENTAL LOG GROUP log_group_regions_pk
  (region_id) ALWAYS;

ALTER SYSTEM ARCHIVE LOG CURRENT;
 
/*

Step 4 Configure Propagation at dbs1.net

Connect to dbs1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs1.net

/*

Configure and schedule propagation from the queue at dbs1.net to the queue at dbs2.net. This configuration specifies that the propagation job propagates all changes to the hr schema. You have the option of omitting the rule set specification, but then everything in the queue will be propagated, which may not be desired if, in the future, multiple capture processes will use the streams_queue.

*/

BEGIN
  -- Create the rule set
  DBMS_RULE_ADM.CREATE_RULE_SET(
    rule_set_name       => 'strmadmin.propagation_dbs1_rules',
    evaluation_context  => 'SYS.STREAMS$_EVALUATION_CONTEXT');
  -- Create rules for all modifications to the hr schema
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name  => 'strmadmin.all_hr_dml',
    condition  => ' :dml.get_object_owner() = ''HR'' AND ' || 
                  ' :dml.is_null_tag() = ''Y'' AND ' ||
                  ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name  => 'strmadmin.all_hr_ddl',
    condition  => ' :ddl.get_object_owner() = ''HR''  AND ' || 
                  ' :ddl.is_null_tag() = ''Y'' AND ' ||
                  ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Add rules to rule set
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_hr_dml', 
    rule_set_name  => 'strmadmin.propagation_dbs1_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_hr_ddl', 
    rule_set_name  => 'strmadmin.propagation_dbs1_rules');
  -- Create the propagation job
  DBMS_PROPAGATION_ADM.CREATE_PROPAGATION(
    propagation_name    => 'dbs1_to_dbs2',
    source_queue        => 'strmadmin.streams_queue',
    destination_queue   => 'strmadmin.streams_queue',
    destination_dblink  => 'dbs2.net',
    rule_set_name       => 'strmadmin.propagation_dbs1_rules');
END;
/

/*

Step 5 Configure the Capture Process at dbs1.net

Create a capture process and rules to capture the entire hr schema at dbs1.net.

*/

BEGIN
  -- Create the rule set
  DBMS_RULE_ADM.CREATE_RULE_SET(
    rule_set_name       => 'strmadmin.demo_rules',
    evaluation_context  => 'SYS.STREAMS$_EVALUATION_CONTEXT');
  --   Create rules that specify the entire hr schema
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name  => 'strmadmin.schema_hr_dml',
    condition  => ' :dml.get_object_owner() = ''HR''  AND ' || 
                  ' :dml.is_null_tag() = ''Y'' AND ' ||
                  ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name  => 'strmadmin.schema_hr_ddl',
    condition  => ' :ddl.get_object_owner() = ''HR''  AND ' || 
                  ' :ddl.is_null_tag() = ''Y'' AND ' ||
                  ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  --  Add the rules to the rule set
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.schema_hr_dml', 
    rule_set_name  => 'strmadmin.demo_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.schema_hr_ddl', 
    rule_set_name  => 'strmadmin.demo_rules');
  --  Create a capture process that uses the rule set
  DBMS_CAPTURE_ADM.CREATE_CAPTURE(
    queue_name    => 'strmadmin.streams_queue',
    capture_name  => 'capture',
    rule_set_name => 'strmadmin.demo_rules');
END;
/

/*

Step 6 Prepare the hr Schema at dbs1.net for Instantiation

While still connected as the Streams administrator at dbs1.net, prepare the hr schema at dbs1.net for instantiation at dbs3.net. This step marks the lowest SCN of the tables in the schema for instantiation. SCNs subsequent to the lowest SCN can be used for instantiation.

Note:

This step is not required in the "Simple Configuration for Sharing Data from a Single Database". In that example, when the ADD_SCHEMA_RULES procedure in the DBMS_STREAMS_ADM package is run in Step 5, the PREPARE_SCHEMA_INSTANTIATION procedure in the DBMS_CAPTURE_ADM package is run automatically for the hr schema.

*/
 
BEGIN
  DBMS_CAPTURE_ADM.PREPARE_SCHEMA_INSTANTIATION(
    schema_name   => 'hr');
END;
/

/*

Step 7 Set the Instantiation SCN for the Existing Tables at Other Databases

In this example, both of the apply processes at dbs2.net will apply transactions to the hr.jobs table with SCNs that were committed after SCN obtained in this step.

Note:

*/

DECLARE
  iscn  NUMBER;         -- Variable to hold instantiation SCN value
BEGIN
  iscn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();
  DBMS_APPLY_ADM.SET_TABLE_INSTANTIATION_SCN@DBS2.NET(
    source_object_name    => 'hr.jobs',
    source_database_name  => 'dbs1.net',
    instantiation_scn     => iscn);
  DBMS_APPLY_ADM.SET_TABLE_INSTANTIATION_SCN@DBS2.NET(
    source_object_name    => 'hr.jobs',
    source_database_name  => 'dbs1.net',
    instantiation_scn     => iscn,
    apply_database_link   =>     'dbs4.net');
END;
/

Step 8 Instantiate the dbs1.net Tables at dbs3.net

The following is an example export command:

exp userid=hr/hr FILE=hr_instant1.dmp TABLES=countries,locations,regions 
OBJECT_CONSISTENT=y

See Also:

Oracle9i Database Utilities for information about performing an export

*/ 

PAUSE Press <RETURN> to continue when the export is complete in the other window 
that you opened.

/*

Transfer the export dump file hr_instant1.dmp to the destination database. In this example, the destination database is dbs3.net.

You can use binary FTP or some other method to transfer the export dump file to the destination database. You may need to open a different window to transfer the file.

*/

PAUSE Press <RETURN> to continue after transferring the dump file. 

/*

When you run the import command, make sure you set the STREAMS_INSTANTIATION import parameter to y. This parameter ensures that the import records export SCN information for each object imported.

The following is an example import command:

imp userid=hr/hr FILE=hr_instant1.dmp IGNORE=y FULL=y COMMIT=y LOG=import.log 
STREAMS_INSTANTIATION=y

See Also:

Oracle9i Database Utilities for information about performing an import

*/

PAUSE Press <RETURN> to continue after the import is complete at dbs3.net. 

/*

Step 9 Configure the Apply Process at dbs3.net

Connect to dbs3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs3.net

/*

Configure dbs3.net to apply DML and DDL changes to the countries table, locations table, and regions table.

*/

BEGIN
  -- Create the rule set
  DBMS_RULE_ADM.CREATE_RULE_SET(
    rule_set_name       => 'strmadmin.apply_rules',
    evaluation_context  => 'SYS.STREAMS$_EVALUATION_CONTEXT');
  -- Rules for hr.countries
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_countries_dml',
    condition    => ' :dml.get_object_owner() = ''HR'' AND ' || 
                    ' :dml.get_object_name() = ''COUNTRIES''  AND ' || 
                    ' :dml.is_null_tag() = ''Y'' AND ' ||
                    ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_countries_ddl',
    condition    => ' :ddl.get_object_owner() = ''HR'' AND ' || 
                    ' :ddl.get_object_name() = ''COUNTRIES'' AND ' || 
                    ' :ddl.is_null_tag() = ''Y'' AND ' ||
                    ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Rules for hr.locations
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_locations_dml',
    condition    => ' :dml.get_object_owner() = ''HR'' AND ' ||
                    ' :dml.get_object_name() = ''LOCATIONS'' AND ' || 
                    ' :dml.is_null_tag() = ''Y'' AND ' ||
                    ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_locations_ddl',
    condition    => ' :ddl.get_object_owner() = ''HR'' AND ' ||
                    ' :ddl.get_object_name() = ''LOCATIONS'' AND ' || 
                    ' :ddl.is_null_tag() = ''Y'' AND ' ||
                    ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Rules for hr.regions
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_regions_dml',
    condition    => ' :dml.get_object_owner() = ''HR'' AND ' ||
                    ' :dml.get_object_name() = ''REGIONS'' AND ' || 
                    ' :dml.is_null_tag() = ''Y'' AND ' ||
                    ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_regions_ddl',
    condition    => ' :ddl.get_object_owner() = ''HR'' AND ' ||
                    ' :ddl.get_object_name() = ''REGIONS'' AND ' || 
                    ' :ddl.is_null_tag() = ''Y'' AND ' ||
                    ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Add rules to rule set
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_countries_dml', 
    rule_set_name  => 'strmadmin.apply_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_countries_ddl', 
    rule_set_name  => 'strmadmin.apply_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_locations_dml', 
    rule_set_name  => 'strmadmin.apply_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_locations_ddl', 
    rule_set_name  => 'strmadmin.apply_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_regions_dml', 
    rule_set_name  => 'strmadmin.apply_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_regions_ddl', 
    rule_set_name  => 'strmadmin.apply_rules');
  -- Create the apply process
  DBMS_APPLY_ADM.CREATE_APPLY(
    queue_name     => 'strmadmin.streams_queue',
    apply_name     => 'apply',
    rule_set_name  => 'strmadmin.apply_rules',
    apply_user     => 'hr',
    apply_captured => true);
END;
/

/*

Step 10 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by the apply process

*/

BEGIN
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => 'strmadmin.apply_rules',
    grantee     => 'hr');
END;
/

/*

Step 11 Start the Apply Process at dbs3.net

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start the apply process at dbs3.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/
 
BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply');
END;
/

/*

Step 12 Configure Propagation at dbs2.net

Connect to dbs2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs2.net

/*

Configure and schedule propagation from the queue at dbs2.net to the queue at dbs3.net. This configuration is an example of directed networks because the changes at dbs2.net originated at dbs1.net.

*/

BEGIN
  -- Create the rule set
  DBMS_RULE_ADM.CREATE_RULE_SET(
    rule_set_name       => 'strmadmin.propagation_dbs3_rules',
    evaluation_context  => 'SYS.STREAMS$_EVALUATION_CONTEXT');
  -- Create rules for all modifications to the countries table
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name  => 'strmadmin.all_countries_dml',
    condition  => ' :dml.get_object_owner() = ''HR'' AND ' || 
                  ' :dml.get_object_name() = ''COUNTRIES'' AND ' || 
                  ' :dml.is_null_tag() = ''Y'' AND ' ||
                  ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name  => 'strmadmin.all_countries_ddl',
    condition  => ' :ddl.get_object_owner() = ''HR'' AND ' || 
                  ' :ddl.get_object_name() = ''COUNTRIES'' AND ' || 
                  ' :ddl.is_null_tag() = ''Y'' AND ' ||
                  ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Create rules for all modifications to the locations table
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name   => 'strmadmin.all_locations_dml',
    condition  => ' :dml.get_object_owner() = ''HR'' AND ' ||
                  ' :dml.get_object_name() = ''LOCATIONS'' AND ' || 
                  ' :dml.is_null_tag() = ''Y'' AND ' ||
                  ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name   => 'strmadmin.all_locations_ddl',
    condition  => ' :ddl.get_object_owner() = ''HR'' AND ' ||
                  ' :ddl.get_object_name() = ''LOCATIONS'' AND ' || 
                  ' :ddl.is_null_tag() = ''Y'' AND ' ||
                  ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Create rules for all modifications to the regions table
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name   => 'strmadmin.all_regions_dml',
    condition  => ' :dml.get_object_owner() = ''HR'' AND ' ||
                  ' :dml.get_object_name() = ''REGIONS'' AND ' || 
                  ' :dml.is_null_tag() = ''Y'' AND ' ||
                  ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name   => 'strmadmin.all_regions_ddl',
    condition  => ' :ddl.get_object_owner() = ''HR'' AND ' ||
                  ' :ddl.get_object_name() = ''REGIONS'' AND ' || 
                  ' :ddl.is_null_tag() = ''Y'' AND ' ||
                  ' :ddl.get_source_database_name() = ''DBS1.NET'' ');
  -- Add rules to rule set
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_countries_dml', 
    rule_set_name  => 'strmadmin.propagation_dbs3_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_countries_ddl', 
    rule_set_name  => 'strmadmin.propagation_dbs3_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_locations_dml',  
    rule_set_name  => 'strmadmin.propagation_dbs3_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_locations_ddl',  
    rule_set_name  => 'strmadmin.propagation_dbs3_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_regions_dml',  
    rule_set_name  => 'strmadmin.propagation_dbs3_rules');
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_regions_ddl',  
    rule_set_name  => 'strmadmin.propagation_dbs3_rules');
  -- Create the propagation job
  DBMS_PROPAGATION_ADM.CREATE_PROPAGATION(
    propagation_name    => 'dbs2_to_dbs3',
    source_queue        => 'strmadmin.streams_queue',
    destination_queue   => 'strmadmin.streams_queue',
    destination_dblink  => 'dbs3.net',
    rule_set_name       => 'strmadmin.propagation_dbs3_rules');
END;
/

/*

Step 13 Create the Transformation for Row LCRs at dbs2.net

Connect to dbs2.net as the hr user.

*/
 
CONNECT hr/hr@dbs2.net

/*

Create the transformation function that transforms row changes resulting from DML statements to the jobs table from dbs1.net into row changes to the assignments table on dbs2.net.

The following function transforms every row LCR for the jobs table into a row LCR for the assignments table.

Note:

If DDL changes were also applied to the assignments table, then another transformation would be required for the DDL LCRs. This transformation would need to change the object name and the DDL text.

*/

CREATE OR REPLACE FUNCTION hr.to_assignments_trans_dml(
  p_in_data in SYS.AnyData) 
  RETURN SYS.AnyData IS out_data SYS.LCR$_ROW_RECORD;
  tc   pls_integer;
BEGIN
  -- Typecast AnyData to LCR$_ROW_RECORD
     tc := p_in_data.GetObject(out_data);
     IF out_data.get_object_name() = 'JOBS'
     THEN
  -- Transform the in_data into the out_data
     out_data.set_object_name('ASSIGNMENTS');
     END IF;
  -- Convert to AnyData
     RETURN SYS.AnyData.ConvertObject(out_data);
END;
/

/*

Step 14 Configure the Apply Process for Local Apply at dbs2.net

Connect to dbs2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs2.net

/*

Configure dbs2.net to apply changes to the local assignments table. Remember that the assignments table receives changes from the jobs table at dbs1.net.

*/

DECLARE
  action_ctx_dml       SYS.RE$NV_LIST;
  action_ctx_ddl       SYS.RE$NV_LIST;
  ac_name              VARCHAR2(30) := 'STREAMS$_TRANSFORM_FUNCTION';
BEGIN
  -- Specify the name-value pair in the action context
  action_ctx_dml := SYS.RE$NV_LIST(SYS.RE$NV_ARRAY());
  action_ctx_dml.ADD_PAIR(
    ac_name, 
    SYS.ANYDATA.CONVERTVARCHAR2('hr.to_assignments_trans_dml'));
  --  Create the rule set strmadmin.apply_rules
  DBMS_RULE_ADM.CREATE_RULE_SET(
    rule_set_name       => 'strmadmin.apply_rules',
    evaluation_context  => 'SYS.STREAMS$_EVALUATION_CONTEXT');
  --  Create a rule that transforms all DML changes to the jobs table into 
  --  DML changes for assignments table
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name       => 'strmadmin.all_jobs_dml',
    condition       => ' :dml.get_object_owner() = ''HR'' AND ' ||
                       ' :dml.get_object_name() = ''JOBS'' AND ' || 
                       ' :dml.is_null_tag() = ''Y'' AND ' ||
                       ' :dml.get_source_database_name() = ''DBS1.NET'' ',
    action_context  => action_ctx_dml);
  --  Add the rule to the rule set
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_jobs_dml', 
    rule_set_name  => 'strmadmin.apply_rules');
  -- Create an apply process that uses the rule set
  DBMS_APPLY_ADM.CREATE_APPLY(
    queue_name     => 'strmadmin.streams_queue',
    apply_name     => 'apply_dbs2',
    rule_set_name  => 'strmadmin.apply_rules',
    apply_user     => 'hr',
    apply_captured => true);
END;
/

/*

Step 15 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by the apply process

*/

BEGIN
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => 'strmadmin.apply_rules',
    grantee     => 'hr');
END;
/

/*

Step 16 Start the Apply Process at dbs2.net for Local Apply

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start the apply process for local apply at dbs2.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_dbs2', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/
 
BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_dbs2');
END;
/

/*

Step 17 Configure the Apply Process at dbs2.net for Apply at dbs4.net

Configure dbs2.net to apply DML changes to the jobs table at dbs4.net, which is a Sybase database. Remember that these changes originated at dbs1.net.

*/

BEGIN
  -- Create the rule set
  DBMS_RULE_ADM.CREATE_RULE_SET(
    rule_set_name      => 'strmadmin.apply_dbs4_rules',
    evaluation_context => 'SYS.STREAMS$_EVALUATION_CONTEXT');
  -- Create rule strmadmin.all_jobs_remote for all modifications 
  -- to the jobs table
  DBMS_RULE_ADM.CREATE_RULE(
    rule_name    => 'strmadmin.all_jobs_remote',
    condition    => ' :dml.get_object_owner() = ''HR'' AND ' ||
                    ' :dml.get_object_name() = ''JOBS'' AND ' || 
                    ' :dml.is_null_tag() = ''Y'' AND ' ||
                    ' :dml.get_source_database_name() = ''DBS1.NET'' ');
  -- Add the rule to the rule set
  DBMS_RULE_ADM.ADD_RULE(
    rule_name      => 'strmadmin.all_jobs_remote', 
    rule_set_name  => 'strmadmin.apply_dbs4_rules');
  -- Create an apply process that uses the rule set
  DBMS_APPLY_ADM.CREATE_APPLY(
    queue_name          => 'strmadmin.streams_queue',
    apply_name          => 'apply_dbs4',
    rule_set_name       => 'strmadmin.apply_dbs4_rules',
    apply_database_link => 'dbs4.net',
    apply_captured      => true);
END;
/

/*

Step 18 Start the Apply Process at dbs2.net for Apply at dbs4.net

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start the remote apply for Sybase using database link dbs4.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_dbs4', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_dbs4');
END;
/

/*

Step 19 Start the Capture Process at dbs1.net

Connect to dbs1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs1.net

/*

Start the capture process at dbs1.net.

*/

BEGIN
  DBMS_CAPTURE_ADM.START_CAPTURE(
    capture_name  => 'capture');
END;
/

/*

Step 20 Check the Spool Results

Check the streams_share_schema2.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

Adding Objects to an Existing Streams Replication Environment

This example extends the Streams environment configured in the previous sections by adding replicated objects to an existing database. To complete this example, you must have completed the tasks in one of the previous examples in this chapter.

This example will add the following tables to the hr schema in the dbs3.net database:

departments
employees
job_history
jobs

When you complete this example, Streams processes changes to these tables with the following series of actions:

The capture process captures changes at dbs1.net and enqueues them at dbs1.net.
A job propagates changes from the queue at dbs1.net to the queue at dbs2.net.
A job propagates changes from the queue at dbs2.net to the queue at dbs3.net.
The apply process at dbs3.net applies the changes at dbs3.net.

When you complete this example, the hr schema at the dbs3.net database will have all of its original tables, because the countries, locations, and regions tables were instantiated at dbs3.net in the previous section.

Figure 19-2 provides an overview of the environment with the added tables.

Figure 19-2 Adding Objects to dbs3.net in the Environment

Text description of strms003.gif follows

Text description of the illustration strms003.gif

Complete the following steps to replicate these tables to the dbs3.net database.

Note:

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_addobjs.out

/*

Step 2 Stop the Apply Process at dbs3.net

Until you finish adding objects to dbs3.net, you must ensure that the apply process that will apply changes for the added objects does not try to apply changes for these objects. You can do this by stopping the capture process at the source database. Or, you can do this by stopping propagation of changes from dbs2.net to dbs3.net. Yet another alternative is to stop the apply process at dbs3.net. This example stops the apply process at dbs3.net.

Connect to dbs3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs3.net

/*

Stop the apply process at dbs3.net.

*/

BEGIN
  DBMS_APPLY_ADM.STOP_APPLY(
    apply_name  => 'apply');
END;
/

/*

Step 3 Configure the Apply Process for the Added Tables at dbs3.net

Configure the apply process at dbs3.net to apply changes to the tables you are adding.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.departments',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.employees',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.job_history',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_RULES(
    table_name      => 'hr.jobs',
    streams_type    => 'apply', 
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

/*

Step 4 Specify the Table Propagation Rules for the Added Tables at dbs2.net

Connect to dbs2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs2.net

/*

Add the tables to the rules for propagation from the queue at dbs2.net to the queue at dbs3.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name               => 'hr.departments',
    streams_name             => 'dbs2_to_dbs3',
    source_queue_name        => 'strmadmin.streams_queue',
    destination_queue_name   => 'strmadmin.streams_queue@dbs3.net', 
    include_dml              =>  true,
    include_ddl              =>  true,
    source_database          => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name              => 'hr.employees',
    streams_name            => 'dbs2_to_dbs3',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs3.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name              => 'hr.job_history',
    streams_name            => 'dbs2_to_dbs3',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs3.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

BEGIN
  DBMS_STREAMS_ADM.ADD_TABLE_PROPAGATION_RULES(
    table_name              => 'hr.jobs',
    streams_name            => 'dbs2_to_dbs3',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs3.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

/*

Step 5 Prepare the Four Added Tables for Instantiation at dbs1.net

Connect to dbs1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs1.net

/*

Prepare the tables for instantiation. These tables will be instantiated at dbs3.net. This step marks the lowest SCN of the tables for instantiation. SCNs subsequent to the lowest SCN can be used for instantiation. Also, this preparation is necessary so that the Streams data dictionary for the relevant propagation jobs and the apply process at dbs3.net contain information about these tables.

See Also:

*/

BEGIN
  DBMS_CAPTURE_ADM.PREPARE_TABLE_INSTANTIATION(
    table_name  => 'hr.departments');
END;
/
 
BEGIN
  DBMS_CAPTURE_ADM.PREPARE_TABLE_INSTANTIATION(
    table_name  => 'hr.employees');
END;
/

BEGIN
  DBMS_CAPTURE_ADM.PREPARE_TABLE_INSTANTIATION(
    table_name  => 'hr.job_history');
END;
/

BEGIN
  DBMS_CAPTURE_ADM.PREPARE_TABLE_INSTANTIATION(
    table_name  => 'hr.jobs');
END;
/

/*

Step 6 Instantiate the dbs1.net Tables at dbs3.net

The following is an example export command:

exp userid=hr/hr FILE=hr_instant2.dmp 
TABLES=departments,employees,job_history,jobs OBJECT_CONSISTENT=y

See Also:

Oracle9i Database Utilities for information about performing an export

*/ 

PAUSE Press <RETURN> to continue when the export is complete in the other window 
that you opened.

/*

Transfer the export dump file hr_instant2.dmp to the destination database. In this example, the destination database is dbs3.net.

You can use binary FTP or some other method to transfer the export dump file to the destination database. You may need to open a different window to transfer the file.

*/

PAUSE Press <RETURN> to continue after transferring the dump file. 

/*

In a different window, connect to the computer that runs the dbs3.net database and import the export dump file hr_instant2.dmp to instantiate the tables in the dbs3.net database. You can use telnet or remote login to connect to the computer that runs dbs3.net.

When you run the import command, make sure you set the STREAMS_INSTANTIATION import parameter to y. This parameter ensures that the import records export SCN information for each object imported.

The following is an example import command:

imp userid=hr/hr FILE=hr_instant2.dmp IGNORE=y FULL=y COMMIT=y LOG=import.log 
STREAMS_INSTANTIATION=y

See Also:

Oracle9i Database Utilities for information about performing an import

*/

PAUSE Press <RETURN> to continue after the import is complete at dbs3.net. 

/*

Step 7 Start the Apply Process at dbs3.net

Start the apply process at dbs3.net. This apply process was stopped in Step 2.

Connect to dbs3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs3.net

/*

Start the apply process at dbs3.net.

*/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply');
END;
/

/*

Step 8 Check the Spool Results

Check the streams_addobjs.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

Adding a Database to an Existing Streams Replication Environment

This example extends the Streams environment configured in the previous sections by adding an additional database to the existing configuration. In this example, an existing Oracle database named dbs5.net is added to receive changes to the entire hr schema from the queue at dbs2.net. Figure 19-3 provides an overview of the environment with the added database.

Figure 19-3 Adding the dbs5.net Oracle Database to the Environment

Text description of strms001.gif follows

Text description of the illustration strms001.gif

To complete this example, you must meet the following prerequisites:

The dbs5.net database must exist.
The dbs2.net and dbs5.net databases must be able to communicate with each other through Oracle Net.
You must have completed the tasks in the previous examples in this chapter.
The "Prerequisites" must be met if you want the entire Streams environment to work properly.

See Also:
Oracle9i Net Services Administrator's Guide
This examples creates a new user to function as the Streams administrator (strmadmin) at each database and prompts you for the tablespace you want to use for this user's data. Before you start this example, either create a new tablespace or identify an existing tablespace for the Streams administrator to use at each database. The Streams administrator should not use the SYSTEM tablespace.

Complete the following steps to add dbs5.net to the Streams environment.

Note:

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_adddb.out

/*

Step 2 Drop All of the Tables in the hr Schema at dbs5.net

This example illustrates instantiating the tables in the hr schema by exporting them from dbs1.net and importing them into dbs5.net. You must delete these tables at dbs5.net for the instantiation portion of this example to work properly.

Connect as hr at dbs5.net.

*/

CONNECT hr/hr@dbs5.net

/*

Drop all tables in the hr schema in the dbs5.net database.

Attention:

If you complete this step and drop all of the tables in the hr schema, then you should complete the remaining sections of this example to reinstantiate the hr schema at dbs5.net. If the hr schema does not exist in an Oracle database, then some examples in the Oracle documentation set may fail.

*/

DROP TABLE hr.countries CASCADE CONSTRAINTS;
DROP TABLE hr.departments CASCADE CONSTRAINTS;
DROP TABLE hr.employees CASCADE CONSTRAINTS;
DROP TABLE hr.job_history CASCADE CONSTRAINTS;
DROP TABLE hr.jobs CASCADE CONSTRAINTS;
DROP TABLE hr.locations CASCADE CONSTRAINTS;
DROP TABLE hr.regions CASCADE CONSTRAINTS;

/*

Step 3 Set Up Users at dbs5.net

Connect to dbs5.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@dbs5.net AS SYSDBA

/*

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/

GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
dbs5.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 4 Create the Streams Queue at dbs5.net

Connect as the Streams administrator at the database you are adding. In this example, that database is dbs5.net.

*/

CONNECT strmadmin/strmadminpw@dbs5.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at dbs5.net. This queue will function as the Streams queue by holding the changes that will be applied at this database.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC  DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 5 Configure the Apply Process at dbs5.net

While still connected as the Streams administrator at dbs5.net, configure the apply process to apply changes to the hr schema.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'dbs1.net');
END;
/

/*

Step 6 Specify hr as the Apply User for the Apply Process at dbs5.net

See Also:

"Configuring a Streams Administrator"

*/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply',
    apply_user => 'hr');
END;
/

/*

Step 7 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by the apply process

*/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

/*

Step 8 Create the Database Link Between dbs2.net and dbs5.net

Connect to dbs2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs2.net

/*

Create the database links to the databases where changes are propagated. In this example, database dbs2.net propagates changes to dbs5.net.

*/

CREATE DATABASE LINK dbs5.net CONNECT TO strmadmin IDENTIFIED BY strmadminpw 
   USING 'dbs5.net';

/*

Step 9 Configure Propagation Between dbs2.net and dbs5.net

While still connected as the Streams administrator at dbs2.net, Configure and schedule propagation from the queue at dbs2.net to the queue at dbs5.net. Remember, changes to the hr schema originated at dbs1.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name             => 'hr', 
    streams_name            => 'dbs2_to_dbs5', 
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@dbs5.net',
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'dbs1.net');
END;
/

/*

Step 10 Prepare the hr Schema for Instantiation at dbs1.net

Connect to dbs1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@dbs1.net

/*

Prepare the hr schema for instantiation. These tables in this schema will be instantiated at dbs5.net. This preparation is necessary so that the Streams data dictionary for the relevant propagation jobs and the apply process at dbs5.net contain information about the hr schema and the objects in the schema.

See Also:

*/

BEGIN
  DBMS_CAPTURE_ADM.PREPARE_SCHEMA_INSTANTIATION(
    schema_name  => 'hr');
END;
/

/*

Step 11 Instantiate the dbs1.net Tables at dbs5.net

Open a different window and export the schema at dbs1.net that will be instantiated at dbs5.net. Make sure you set the OBJECT_CONSISTENT export parameter to y when you run the export command. Also, make sure no DDL changes are made to the objects being exported during the export.

The following is an example export command:

exp hr/hr FILE=hr_schema.dmp OWNER=hr OBJECT_CONSISTENT=y

See Also:

Oracle9i Database Utilities for information about performing an export

*/ 

PAUSE Press <RETURN> to continue when the export is complete in the other window 
that you opened.

/*

Transfer the export dump file hr_schema.dmp to the destination database. In this example, the destination database is dbs5.net.

You can use binary FTP or some other method to transfer the export dump file to the destination database. You may need to open a different window to transfer the file.

*/

PAUSE Press <RETURN> to continue after transferring the dump file. 

/*

In a different window, connect to the computer that runs the dbs5.net database and import the export dump file hr_schema.dmp to instantiate the tables in the dbs5.net database. You can use telnet or remote login to connect to the computer that runs dbs5.net.

When you run the import command, make sure you set the STREAMS_INSTANTIATION import parameter to y. This parameter ensures that the import records export SCN information for each object imported.

The following is an example import command:

imp hr/hr FILE=hr_schema.dmp FROMUSER=hr IGNORE=y COMMIT=y LOG=import.log 
STREAMS_INSTANTIATION=y

See Also:

Oracle9i Database Utilities for information about performing an import

*/

PAUSE Press <RETURN> to continue after the import is complete at dbs5.net. 

/*

Step 12 Start the Apply Process at dbs5.net

Connect as the Streams administrator at dbs5.net.

*/

CONNECT strmadmin/strmadminpw@dbs5.net

/*

Set the disable_on_error parameter to n so that the apply process will not be disabled if it encounters an error, and start apply process at dbs5.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply');
END;
/

/*

Step 13 Check the Spool Results

Check the streams_adddb.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

Multiple Source Databases in an Oracle-Only Environment

This example illustrates using Streams to replicate data for a schema among three Oracle databases. DML and DDL changes made to tables in the hr schema are captured at all databases in the environment and propagated to each of the other databases in the environment.

This example contains these parts:

Figure 19-4 provides an overview of the environment.

Figure 19-4 Example Environment That Shares Data from Multiple Databases

Text description of strms004.gif follows

Text description of the illustration strms004.gif

As illustrated in Figure 19-4, all of the databases will contain the hr schema when the example is complete. However, at the beginning of the example, the hr schema exists only at mult1.net. During the example, you instantiate the hr schema at mult2.net and mult3.net.

In this example, Streams is used to perform the following series of actions:

After instantiation, the capture process at each database captures DML and DDL changes for all of the tables in the hr schema and enqueues them into a local queue.
Each database propagates these changes to all of the other databases in the environment.
The apply process at each database applies changes in the hr schema received from the other databases in the environment.

This example uses only one queue for each database, but you can use multiple queues for each database if you want to separate changes from different source databases. In addition, this example avoids sending changes back to their source database by using the default apply tag for the apply processes. When you create an apply process, the changes applied by the apply process have redo entries with a tag of '00' (double zero) by default. These changes are not recaptured because, by default, rules created by the DBMS_STREAMS_ADM package have an is_null_tag()='Y' condition by default, and this condition ensures that each capture process captures a change in a redo entry only if the tag for the redo entry is NULL.

See Also:

Oracle9i Streams for more information about tags

Prerequisites

The following prerequisites must be completed before you begin the example in this section.

Set the following initialization parameters to the values indicated:
- GLOBAL_NAMES: This parameter must be set to true at each database that is participating in your Streams environment. Make sure the global names of the databases are mult1.net, mult2.net, and mult3.net.
- JOB_QUEUE_PROCESSES: This parameter must be set to at least 2 at each database that is propagating changes. It should be set to the same value as the maximum number of jobs that can run simultaneously plus one.
- COMPATIBLE: This parameter must be set to 9.2.0 or higher.
- LOG_PARALLELISM: This parameter must be set to 1 at each database that captures events. In this example, this parameter must be set to 1 at each database.
  
  See Also:
  "Setting Initialization Parameters Relevant to Streams" for information about other initialization parameters that are important in a Streams environment
Any database where changes are captured must be running in ARCHIVELOG mode. In this example, all databases are capturing changes, and so all databases must be running in ARCHIVELOG mode.

See Also:
Oracle9i Database Administrator's Guide for information about running a database in ARCHIVELOG mode
Configure your network and Oracle Net so that all three databases can communicate with each other.

See Also:
Oracle9i Net Services Administrator's Guide

Setting Up Users and Creating Queues and Database Links

This section illustrates how to set up users and create queues and database links for a Streams replication environment that includes three Oracle databases. The remaining parts of this example depend on the users and queues that you configure in this section.

Complete the following steps to set up the users and to create the streams_queue at all of the databases.

Note:

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_setup_mult.out

/*

Step 2 Alter the hr.countries Table at mult1.net

Connect to mult1.net as the hr user.

*/
 
CONNECT hr/hr@mult1.net

/*

Convert the hr.countries table from an index-organized table to a regular table. Currently, the capture process cannot capture changes to index-organized tables.

*/
 
ALTER TABLE countries RENAME TO countries_orig;

CREATE TABLE hr.countries( 
  country_id      CHAR(2) CONSTRAINT  country_id_nn_noiot NOT NULL, 
  country_name    VARCHAR2(40), 
  region_id       NUMBER, 
  CONSTRAINT      country_c_id_pk_noiot  PRIMARY KEY (country_id)); 

ALTER TABLE hr.countries
ADD (CONSTRAINT countr_reg_fk_noiot
             FOREIGN KEY (region_id)
         REFERENCES regions(region_id));
    
INSERT INTO COUNTRIES (SELECT * FROM hr.countries_orig);

ALTER TABLE locations DROP CONSTRAINT loc_c_id_fk;

ALTER TABLE locations
  ADD (CONSTRAINT loc_c_id_fk
    FOREIGN KEY (country_id)
    REFERENCES countries(country_id));

/*

Step 3 Create an Alternate Tablespace for the LogMiner Tables at mult1.net

Connect to mult1.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@mult1.net AS SYSDBA

/*

Create an alternate tablespace for the LogMiner tables.

Note:

Each ACCEPT command must appear on a single line in the script.

*/

ACCEPT tspace_name DEFAULT 'logmnrts' PROMPT 'Enter the name of the tablespace 
(for example, logmnrts): '

ACCEPT db_file_directory DEFAULT '' PROMPT 'Enter the complete path to the 
datafile directory (for example, /usr/oracle/dbs): '

ACCEPT db_file_name DEFAULT 'logmnrts.dbf' PROMPT 'Enter the name of the 
datafile (for example, logmnrts.dbf): '

CREATE TABLESPACE &tspace_name DATAFILE '&db_file_directory/&db_file_name' 
  SIZE 25 M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
   
EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('&tspace_name');

/*

Step 4 Set Up Users at mult1.net

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/

GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
mult1.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 5 Create the Streams Queue at mult1.net

Connect as the Streams administrator at mult1.net.

*/

CONNECT strmadmin/strmadminpw@mult1.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at mult1.net. This queue will function as the Streams queue by holding the changes that will be applied at this database and the changes that will be propagated to other databases.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC  DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 6 Create the Database Links at mult1.net

Create database links from the current database to the other databases in the environment.

*/

CREATE DATABASE LINK mult2.net CONNECT TO strmadmin 
   IDENTIFIED BY strmadminpw USING 'mult2.net';

CREATE DATABASE LINK mult3.net CONNECT TO strmadmin 
   IDENTIFIED BY strmadminpw USING 'mult3.net';

/*

Step 7 Prepare the Tables at mult1.net for Latest Time Conflict Resolution

This example will configure the tables in the hr schema for conflict resolution based on the latest time for a transaction.

Connect to mult1.net as the hr user.

*/
 
CONNECT hr/hr@mult1.net

/*

Add a time column to each table in the hr schema.

*/
 
ALTER TABLE hr.countries ADD (time TIMESTAMP WITH TIME ZONE);
ALTER TABLE hr.departments ADD (time TIMESTAMP WITH TIME ZONE);
ALTER TABLE hr.employees ADD (time TIMESTAMP WITH TIME ZONE);
ALTER TABLE hr.job_history ADD (time TIMESTAMP WITH TIME ZONE);
ALTER TABLE hr.jobs ADD (time TIMESTAMP WITH TIME ZONE);
ALTER TABLE hr.locations ADD (time TIMESTAMP WITH TIME ZONE);
ALTER TABLE hr.regions ADD (time TIMESTAMP WITH TIME ZONE);

/*

Create a trigger for each table in the hr schema to insert the time of a transaction for each row inserted or updated by the transaction.

*/

CREATE OR REPLACE TRIGGER hr.insert_time_countries
BEFORE
  INSERT OR UPDATE ON hr.countries FOR EACH ROW
BEGIN
   -- Consider time synchronization problems. The previous update to this 
   -- row may have originated from a site with a clock time ahead of the 
   -- local clock time.
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

CREATE OR REPLACE TRIGGER hr.insert_time_departments
BEFORE
  INSERT OR UPDATE ON hr.departments FOR EACH ROW
BEGIN
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

CREATE OR REPLACE TRIGGER hr.insert_time_employees
BEFORE
  INSERT OR UPDATE ON hr.employees FOR EACH ROW
BEGIN
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

CREATE OR REPLACE TRIGGER hr.insert_time_job_history
BEFORE
  INSERT OR UPDATE ON hr.job_history FOR EACH ROW
BEGIN
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

CREATE OR REPLACE TRIGGER hr.insert_time_jobs
BEFORE
  INSERT OR UPDATE ON hr.jobs FOR EACH ROW
BEGIN
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

CREATE OR REPLACE TRIGGER hr.insert_time_locations
BEFORE
  INSERT OR UPDATE ON hr.locations FOR EACH ROW
BEGIN
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

CREATE OR REPLACE TRIGGER hr.insert_time_regions
BEFORE
  INSERT OR UPDATE ON hr.regions FOR EACH ROW
BEGIN
   IF :OLD.TIME IS NULL OR :OLD.TIME < SYSTIMESTAMP THEN
     :NEW.TIME := SYSTIMESTAMP;
   ELSE
     :NEW.TIME := :OLD.TIME + 1 / 86400;
   END IF;
END;
/

/*

Step 8 Create an Alternate Tablespace for the LogMiner Tables at mult2.net

Connect to mult2.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@mult2.net AS SYSDBA

/*

Create an alternate tablespace for the LogMiner tables.

Note:

Each ACCEPT command must appear on a single line in the script.

*/

ACCEPT tspace_name DEFAULT 'logmnrts' PROMPT 'Enter the name of the tablespace 
(for example, logmnrts): '

ACCEPT db_file_directory DEFAULT '' PROMPT 'Enter the complete path to the 
datafile directory (for example, /usr/oracle/dbs): '

ACCEPT db_file_name DEFAULT 'logmnrts.dbf' PROMPT 'Enter the name of the 
datafile (for example, logmnrts.dbf): '

CREATE TABLESPACE &tspace_name DATAFILE '&db_file_directory/&db_file_name' 
  SIZE 25 M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
   
EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('&tspace_name');

/*

Step 9 Set Up Users at mult2.net

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/

GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
mult2.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_FLASHBACK        TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 10 Create the Streams Queue at mult2.net

Connect as the Streams administrator at mult2.net.

*/

CONNECT strmadmin/strmadminpw@mult2.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at mult2.net. This queue will function as the Streams queue by holding the changes that will be applied at this database and the changes that will be propagated to other databases.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC  DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 11 Create the Database Links at mult2.net

Create database links from the current database to the other databases in the environment.

*/

CREATE DATABASE LINK mult1.net CONNECT TO strmadmin 
   IDENTIFIED BY strmadminpw USING 'mult1.net';

CREATE DATABASE LINK mult3.net CONNECT TO strmadmin 
   IDENTIFIED BY strmadminpw USING 'mult3.net';

/*

Step 12 Drop All of the Tables in the hr Schema at mult2.net

This example illustrates instantiating the tables in the hr schema at mult2.net by exporting these tables from mult1.net and importing them into mult2.net. You must drop the tables in the hr schema at mult2.net for the instantiation portion of this example to work properly.

Attention:

If you complete the following steps and drop the tables in the hr schema at mult2.net, then you should complete the remaining steps of this example to reinstantiate the hr schema. If the hr schema does not exist in an Oracle database, then some examples in the Oracle documentation set may fail.

Connect as hr at mult2.net.

*/

CONNECT hr/hr@mult2.net

/*

Drop all tables in the hr schema in the mult2.net database.

*/

DROP TABLE hr.countries CASCADE CONSTRAINTS;
DROP TABLE hr.departments CASCADE CONSTRAINTS;
DROP TABLE hr.employees CASCADE CONSTRAINTS;
DROP TABLE hr.job_history CASCADE CONSTRAINTS;
DROP TABLE hr.jobs CASCADE CONSTRAINTS;
DROP TABLE hr.locations CASCADE CONSTRAINTS;
DROP TABLE hr.regions CASCADE CONSTRAINTS;

/*

Step 13 Create an Alternate Tablespace for the LogMiner Tables at mult3.net

Connect to mult3.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@mult3.net AS SYSDBA

/*

Create an alternate tablespace for the LogMiner tables.

Note:

Each ACCEPT command must appear on a single line in the script.

*/

ACCEPT tspace_name DEFAULT 'logmnrts' PROMPT 'Enter the name of the tablespace 
(for example, logmnrts): '

ACCEPT db_file_directory DEFAULT '' PROMPT 'Enter the complete path to the 
datafile directory (for example, /usr/oracle/dbs): '

ACCEPT db_file_name DEFAULT 'logmnrts.dbf' PROMPT 'Enter the name of the 
datafile (for example, logmnrts.dbf): '

CREATE TABLESPACE &tspace_name DATAFILE '&db_file_directory/&db_file_name' 
  SIZE 25 M REUSE AUTOEXTEND ON MAXSIZE UNLIMITED;
   
EXECUTE DBMS_LOGMNR_D.SET_TABLESPACE('&tspace_name');

/*

Step 14 Set Up Users at mult3.net

Note:

To ensure security, use a password other than strmadminpw for the Streams administrator.
The SELECT_CATALOG_ROLE is not required for the Streams administrator. It is granted in this example so that the Streams administrator can monitor the environment easily.
If you plan to use the Streams tool in Oracle Enterprise Manager, then grant the Streams administrator SELECT ANY DICTIONARY privilege, in addition to the privileges shown in this step.
The ACCEPT command must appear on a single line in the script.

See Also:

"Configuring a Streams Administrator"

*/

GRANT CONNECT, RESOURCE, SELECT_CATALOG_ROLE 
  TO strmadmin IDENTIFIED BY strmadminpw;

ACCEPT streams_tbs PROMPT 'Enter the tablespace for the Streams administrator on 
mult3.net: '

ALTER USER strmadmin DEFAULT TABLESPACE &streams_tbs
                     QUOTA UNLIMITED ON &streams_tbs;

GRANT EXECUTE ON DBMS_APPLY_ADM        TO strmadmin;
GRANT EXECUTE ON DBMS_AQADM            TO strmadmin;
GRANT EXECUTE ON DBMS_CAPTURE_ADM      TO strmadmin;
GRANT EXECUTE ON DBMS_FLASHBACK        TO strmadmin;
GRANT EXECUTE ON DBMS_PROPAGATION_ADM  TO strmadmin;
GRANT EXECUTE ON DBMS_STREAMS_ADM      TO strmadmin;

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_SET_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

BEGIN 
  DBMS_RULE_ADM.GRANT_SYSTEM_PRIVILEGE(
    privilege    => DBMS_RULE_ADM.CREATE_RULE_OBJ, 
    grantee      => 'strmadmin', 
    grant_option => FALSE);
END;
/

/*

Step 15 Create the Streams Queue at mult3.net

Connect as the Streams administrator at mult3.net.

*/

CONNECT strmadmin/strmadminpw@mult3.net

/*

Run the SET_UP_QUEUE procedure to create a queue named streams_queue at mult3.net. This queue will function as the Streams queue by holding the changes that will be applied at this database and the changes that will be propagated to other databases.

Running the SET_UP_QUEUE procedure performs the following actions:

Creates a queue table named streams_queue_table. This queue table is owned by the Streams administrator (strmadmin) and uses the default storage of this user.
Creates a queue named streams_queue owned by the Streams administrator (strmadmin).
Starts the queue.

*/

EXEC  DBMS_STREAMS_ADM.SET_UP_QUEUE();

/*

Step 16 Create the Database Links at mult3.net

Create database links from the current database to the other databases in the environment.

*/

CREATE DATABASE LINK mult1.net CONNECT TO strmadmin 
   IDENTIFIED BY strmadminpw USING 'mult1.net';

CREATE DATABASE LINK mult2.net CONNECT TO strmadmin 
   IDENTIFIED BY strmadminpw USING 'mult2.net';

/*

Step 17 Drop All of the Tables in the hr Schema at mult3.net

This example illustrates instantiating the tables in the hr schema at mult3.net by exporting these tables from mult1.net and importing them into mult3.net. You must drop the tables in the hr schema at mult3.net for the instantiation portion of this example to work properly.

Attention:

If you complete the following steps and drop the tables in the hr schema at mult3.net, then you should complete the remaining steps of this example to reinstantiate the hr schema. If the hr schema does not exist in an Oracle database, then some examples in the Oracle documentation set may fail.

Connect as hr at mult3.net.

*/

CONNECT hr/hr@mult3.net

/*

Drop all tables in the hr schema in the mult3.net database.

*/

DROP TABLE hr.countries CASCADE CONSTRAINTS;
DROP TABLE hr.departments CASCADE CONSTRAINTS;
DROP TABLE hr.employees CASCADE CONSTRAINTS;
DROP TABLE hr.job_history CASCADE CONSTRAINTS;
DROP TABLE hr.jobs CASCADE CONSTRAINTS;
DROP TABLE hr.locations CASCADE CONSTRAINTS;
DROP TABLE hr.regions CASCADE CONSTRAINTS;

/*

Step 18 Check the Spool Results

Check the streams_setup_mult.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

Example Script for Sharing Data from Multiple Databases

Complete the following steps to configure a Streams environment that shares information from multiple databases.

Note:

/************************* BEGINNING OF SCRIPT ******************************

Step 1 Show Output and Spool Results

Run SET ECHO ON and specify the spool file for the script. Check the spool file for errors after you run this script.

*/

SET ECHO ON
SPOOL streams_mult.out

/*

Step 2 Specify Supplemental Logging at mult1.net

Connect to mult1.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@mult1.net AS SYSDBA

/*

Note:

For convenience, this example includes the primary key column(s) for each table and the columns used for update conflict resolution in a single unconditional log group. You may choose to place the primary key column(s) for each table in an unconditional log group and the columns used for update conflict resolution in a conditional log group.

See Also:

*/

ALTER TABLE hr.countries ADD SUPPLEMENTAL LOG GROUP log_group_countries
  (country_id, country_name, region_id, time) ALWAYS;

ALTER TABLE hr.departments ADD SUPPLEMENTAL LOG GROUP log_group_departments
  (department_id, department_name, manager_id, location_id, time) ALWAYS;

ALTER TABLE hr.employees ADD SUPPLEMENTAL LOG GROUP log_group_employees
  (employee_id, first_name, last_name, email, phone_number, hire_date, job_id, 
   salary, commission_pct, manager_id, department_id, time) ALWAYS;

ALTER TABLE hr.jobs ADD SUPPLEMENTAL LOG GROUP log_group_jobs
  (job_id, job_title, min_salary, max_salary, time) ALWAYS;

ALTER TABLE hr.job_history ADD SUPPLEMENTAL LOG GROUP log_group_job_history
  (employee_id, start_date, end_date, job_id, department_id, time) ALWAYS;

ALTER TABLE hr.locations ADD SUPPLEMENTAL LOG GROUP log_group_locations
  (location_id, street_address, postal_code, city, state_province, 
   country_id, time) ALWAYS;

ALTER TABLE hr.regions ADD SUPPLEMENTAL LOG GROUP log_group_regions
  (region_id, region_name, time) ALWAYS;

ALTER SYSTEM ARCHIVE LOG CURRENT;

/*

Step 3 Create the Capture Process at mult1.net

Connect to mult1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult1.net

/*

Create the capture process to capture changes to the entire hr schema at mult1.net. After this step is complete, users can modify tables in the hr schema at mult1.net.

*/

BEGIN   
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name   => 'hr',
    streams_type  => 'capture',
    streams_name  => 'capture_hr', 
    queue_name    => 'strmadmin.streams_queue',
    include_dml   =>  true,
    include_ddl   =>  true);
END;
/

/*

Step 4 Create One Apply Process at mult1.net for Each Source Database

Configure mult1.net to apply changes to the hr schema at mult2.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply_from_mult2',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'mult2.net');
END;
/

/*

Configure mult1.net to apply changes to the hr schema at mult3.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply_from_mult3',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'mult3.net');
END;
/

/*

Step 5 Specify hr as the Apply User for Each Apply Process at mult1.net

See Also:

"Configuring a Streams Administrator"

*/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_from_mult2',
    apply_user => 'hr');
END;
/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_from_mult3',
    apply_user => 'hr');
END;
/

/*

Step 6 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by each apply process

*/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_FROM_MULT2';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_FROM_MULT3';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

/*

Step 7 Configure Latest Time Conflict Resolution at mult1.net

Specify an update conflict handler for each table in the hr schema. For each table, designate the time column as the resolution column for a MAXIMUM conflict handler. When an update conflict occurs, such an update conflict handler applies the transaction with the latest (or greater) time and discards the transaction with the earlier (or lesser) time. The column lists for each table do not include the primary key because this example assumes that primary key values are never updated.

*/
 
DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'country_name';
  cols(2) := 'region_id';
  cols(3) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.countries',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'department_name';
  cols(2) := 'manager_id';
  cols(3) := 'location_id';
  cols(4) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.departments',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1)  := 'first_name';
  cols(2)  := 'last_name';
  cols(3)  := 'email';
  cols(4)  := 'phone_number';
  cols(5)  := 'hire_date';
  cols(6)  := 'job_id';
  cols(7)  := 'salary';
  cols(8)  := 'commission_pct';
  cols(9)  := 'manager_id';
  cols(10) := 'department_id';
  cols(11) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.employees',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'job_title';
  cols(2) := 'min_salary';
  cols(3) := 'max_salary';
  cols(4) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.jobs',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'employee_id';
  cols(2) := 'start_date';
  cols(3) := 'end_date';
  cols(4) := 'job_id';
  cols(5) := 'department_id';
  cols(6) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.job_history',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'street_address';
  cols(2) := 'postal_code';
  cols(3) := 'city';
  cols(4) := 'state_province';
  cols(5) := 'country_id';
  cols(6) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.locations',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'region_name';
  cols(2) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.regions',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

/*

Step 8 Configure Propagation at mult1.net

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at mult1.net to the queue at mult2.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name               => 'hr', 
    streams_name              => 'mult1_to_mult2',    
    source_queue_name         => 'strmadmin.streams_queue',
    destination_queue_name    => 'strmadmin.streams_queue@mult2.net',
    include_dml               =>  true,
    include_ddl               =>  true,
    source_database           => 'mult1.net');
END;
/

/*

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at mult1.net to the queue at mult3.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name               => 'hr', 
    streams_name              => 'mult1_to_mult3',    
    source_queue_name         => 'strmadmin.streams_queue',
    destination_queue_name    => 'strmadmin.streams_queue@mult3.net',
    include_dml               =>  true,
    include_ddl               =>  true,
    source_database           => 'mult1.net');
END;
/

/*

Step 9 Create the Capture Process at mult2.net.

Connect to mult2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult2.net

/*

Create the capture process to capture changes to the entire hr schema at mult2.net.

*/

BEGIN   
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name   => 'hr',
    streams_type  => 'capture',
    streams_name  => 'capture_hr', 
    queue_name    => 'strmadmin.streams_queue',
    include_dml   =>  true,
    include_ddl   =>  true);
END;
/

/*

Step 10 Set the Instantiation SCN for mult2.net at the Other Databases

In this example, the hr schema already exists at all of the databases. The tables in the schema exist only at mult1.net until they are instantiated at mult2.net and mult3.net in Step 21. The instantiation is done using an export of the tables from mult1.net. These export/import operations set the schema instantiation SCNs for mult1.net at mult2.net and mult3.net automatically.

However, the instantiation SCNs for mult2.net and mult3.net are not set automatically at the other sites in the environment. This step sets the schema instantiation SCN for mult2.net manually at mult1.net and mult3.net. The current SCN at mult2.net is obtained by using the GET_SYSTEM_CHANGE_NUMBER function in the DBMS_FLASHBACK package at mult2.net. This SCN is used at mult1.net and mult3.net to run the SET_SCHEMA_INSTANTIATION_SCN procedure in the DBMS_APPLY_ADM package.

The SET_SCHEMA_INSTANTIATION_SCN procedure controls which DDL LCRs for a schema are ignored by an apply process and which DDL LCRs for a schema are applied by an apply process. If the commit SCN of a DDL LCR for a database object in a schema from a source database is less than or equal to the instantiation SCN for that database object at some destination database, then the apply process at the destination database disregards the DDL LCR. Otherwise, the apply process applies the DDL LCR.

Because you are running the SET_SCHEMA_INSTANTIATION_SCN procedure before the tables are instantiated at mult2.net, and because the local capture process is configured already, you do not need to run the SET_TABLE_INSTANTIATION_SCN for each table after the instantiation. In this example, an apply process at both mult1.net and mult3.net will apply transactions to the tables in the hr schema with SCNs that were committed after the SCN obtained in this step.

Note:

In a case where you are instantiating a schema that does not exist, you can set the global instantiation SCN instead of the schema instantiation SCN.
In a case where the tables are instantiated before you set the instantiation SCN, you must set the schema instantiation SCN and the instantiation SCN for each table in the schema.

*/

DECLARE
  iscn  NUMBER;         -- Variable to hold instantiation SCN value
BEGIN
  iscn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();
  DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN@MULT1.NET(
    source_schema_name    => 'hr',
    source_database_name  => 'mult2.net',
    instantiation_scn     => iscn);
  DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN@MULT3.NET(
    source_schema_name    => 'hr',
    source_database_name  => 'mult2.net',
    instantiation_scn     => iscn);
END;
/

Step 11 Create One Apply Process at mult2.net for Each Source Database

Configure mult2.net to apply changes to the hr schema at mult1.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply_from_mult1',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'mult1.net');
END;
/

/*

Configure mult2.net to apply changes to the hr schema at mult3.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply_from_mult3',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'mult3.net');
END;
/

/*

Step 12 Specify hr as the Apply User for Each Apply Process at mult2.net

See Also:

"Configuring a Streams Administrator"

*/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_from_mult1',
    apply_user => 'hr');
END;
/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_from_mult3',
    apply_user => 'hr');
END;
/

/*

Step 13 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by each apply process

*/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_FROM_MULT1';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_FROM_MULT3';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

/*

Step 14 Configure Propagation at mult2.net

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at mult2.net to the queue at mult1.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name             => 'hr',
    streams_name            => 'mult2_to_mult1',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@mult1.net',
    include_dml             =>  true,
    include_ddl             =>  true, 
    source_database         => 'mult2.net');
END;
/

/*

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at mult2.net to the queue at mult3.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name             => 'hr',
    streams_name            => 'mult2_to_mult3',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@mult3.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'mult2.net');
END;
/

/*

Step 15 Create the Capture Process at mult3.net

Connect to mult3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult3.net

/*

Create the capture process to capture changes to the entire hr schema at mult3.net.

*/

BEGIN   
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name   => 'hr',
    streams_type  => 'capture',
    streams_name  => 'capture_hr', 
    queue_name    => 'strmadmin.streams_queue',
    include_dml   =>  true,
    include_ddl   =>  true);
END;
/

/*

Step 16 Set the Instantiation SCN for mult3.net at the Other Databases

However, the instantiation SCNs for mult2.net and mult3.net are not set automatically at the other sites in the environment. This step sets the schema instantiation SCN for mult3.net manually at mult1.net and mult2.net. The current SCN at mult3.net is obtained by using the GET_SYSTEM_CHANGE_NUMBER function in the DBMS_FLASHBACK package at mult3.net. This SCN is used at mult1.net and mult2.net to run the SET_SCHEMA_INSTANTIATION_SCN procedure in the DBMS_APPLY_ADM package.

Because you are running the SET_SCHEMA_INSTANTIATION_SCN procedure before the tables are instantiated at mult3.net, and because the local capture process is configured already, you do not need to run the SET_TABLE_INSTANTIATION_SCN for each table after the instantiation. In this example, an apply process at both mult1.net and mult2.net will apply transactions to the tables in the hr schema with SCNs that were committed after the SCN obtained in this step.

Note:

In a case where you are instantiating a schema that does not exist, you can set the global instantiation SCN instead of the schema instantiation SCN.
In a case where the tables are instantiated before you set the instantiation SCN, you must set the schema instantiation SCN and the instantiation SCN for each table in the schema.

*/

DECLARE
  iscn  NUMBER;         -- Variable to hold instantiation SCN value
BEGIN
  iscn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();
  DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN@MULT1.NET(
    source_schema_name    => 'hr',
    source_database_name  => 'mult3.net',
    instantiation_scn     => iscn);
  DBMS_APPLY_ADM.SET_SCHEMA_INSTANTIATION_SCN@MULT2.NET(
    source_schema_name    => 'hr',
    source_database_name  => 'mult3.net',
    instantiation_scn     => iscn);
END;
/

/*

Step 17 Create One Apply Process at mult3.net for Each Source Database

Configure mult3.net to apply changes to the hr schema at mult1.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply_from_mult1',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'mult1.net');
END;
/

/*

Configure mult3.net to apply changes to the hr schema at mult2.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_RULES(
    schema_name     => 'hr',   
    streams_type    => 'apply',
    streams_name    => 'apply_from_mult2',
    queue_name      => 'strmadmin.streams_queue',
    include_dml     =>  true,
    include_ddl     =>  true,
    source_database => 'mult2.net');
END;
/

/*

Step 18 Specify hr as the Apply User for Each Apply Process at mult3.net

See Also:

"Configuring a Streams Administrator"

*/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_from_mult1',
    apply_user => 'hr');
END;
/

BEGIN
  DBMS_APPLY_ADM.ALTER_APPLY(
    apply_name => 'apply_from_mult2',
    apply_user => 'hr');
END;
/

/*

Step 19 Grant the hr User Execute Privilege on the Apply Process Rule Set

Because the hr user was specified as the apply user in the previous step, the hr user requires execute privilege on the rule set used by each apply process

*/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_FROM_MULT1';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

DECLARE
   rs_name  VARCHAR2(64);   -- Variable to hold rule set name
BEGIN
  SELECT RULE_SET_OWNER||'.'||RULE_SET_NAME 
    INTO rs_name 
    FROM DBA_APPLY 
    WHERE APPLY_NAME='APPLY_FROM_MULT2';
  DBMS_RULE_ADM.GRANT_OBJECT_PRIVILEGE(
    privilege   => SYS.DBMS_RULE_ADM.EXECUTE_ON_RULE_SET,
    object_name => rs_name,
    grantee     => 'hr');
END;
/

/*

Step 20 Configure Propagation at mult3.net

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at mult3.net to the queue at mult1.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name             => 'hr',
    streams_name            => 'mult3_to_mult1',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@mult1.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'mult3.net');
END;
/

/*

Configure and schedule propagation of DML and DDL changes in the hr schema from the queue at mult3.net to the queue at mult2.net.

*/

BEGIN
  DBMS_STREAMS_ADM.ADD_SCHEMA_PROPAGATION_RULES(
    schema_name             => 'hr',
    streams_name            => 'mult3_to_mult2',
    source_queue_name       => 'strmadmin.streams_queue',
    destination_queue_name  => 'strmadmin.streams_queue@mult2.net', 
    include_dml             =>  true,
    include_ddl             =>  true,
    source_database         => 'mult3.net');
END;
/

/*

Step 21 Instantiate the hr Schema at mult2.net and mult3.net

Open a different window and export the schema at mult1.net that will be instantiated at mult2.net and mult3.net. Make sure you set the OBJECT_CONSISTENT export parameter to y when you run the export command. Also, make sure no DDL changes are made to the objects being exported during the export.

The following is an example export command:

exp hr/hr FILE=hr_schema.dmp OWNER=hr OBJECT_CONSISTENT=y

See Also:

Oracle9i Database Utilities for information about performing an export

*/ 

PAUSE Press <RETURN> to continue when the export is complete in the other window 
that you opened.

/*

Transfer the export dump file hr_schema.dmp to the destination databases. In this example, the destination databases are mult2.net and mult3.net.

You can use binary FTP or some other method to transfer the export dump file to the destination database. You may need to open a different window to transfer the file.

*/

PAUSE Press <RETURN> to continue after transferring the dump file to all of the 
other databases in the environment. 

/*

In a different window, connect to the computer that runs the mult2.net database and import the export dump file hr_schema.dmp to instantiate the tables in the mult2.net database. You can use telnet or remote login to connect to the computer that runs mult2.net.

When you run the import command, make sure you set the STREAMS_INSTANTIATION import parameter to y. This parameter ensures that the import records export SCN information for each object imported.

Also, make sure no changes are made to the tables in the schema being imported at the destination database (mult2.net) until the import is complete and the capture process is created.

The following is an example import command:

imp hr/hr FILE=hr_schema.dmp FROMUSER=hr IGNORE=y COMMIT=y LOG=import.log 
STREAMS_INSTANTIATION=y

See Also:

Oracle9i Database Utilities for information about performing an import

*/

PAUSE Press <RETURN> to continue after the import is complete at mult2.net. 

/*

In a different window, connect to the computer that runs the mult3.net database and import the export dump file hr_schema.dmp to instantiate the tables in the mult3.net database.

After you connect to mult3.net, perform the import in the same way that you did for mult2.net.

*/

PAUSE Press <RETURN> to continue after the import is complete at mult3.net. 

/*

Attention:

Make sure no changes are made to the imported tables at mult2.net and mult3.net until you specify supplemental logging at both databases in Step 22 and Step 23.

Step 22 Specify Supplemental Logging at mult2.net

Connect to mult2.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@mult2.net AS SYSDBA

/*

Set the session tag to a non-NULL value so that the supplemental logging changes are not captured by the capture process at mult2.net.

*/
 
EXEC DBMS_STREAMS.SET_TAG(tag => HEXTORAW('01'));

/*

See Also:

Chapter 8, "Streams Tags"

Specify an unconditional supplemental log group that includes the primary key for each table and the column list for each table, as specified in "Configure Latest Time Conflict Resolution at mult2.net". After this step is complete, users can modify tables in the hr schema at mult2.net.

Note:

See Also:

*/

ALTER TABLE hr.countries ADD SUPPLEMENTAL LOG GROUP log_group_countries
  (country_id, country_name, region_id, time) ALWAYS;

ALTER TABLE hr.departments ADD SUPPLEMENTAL LOG GROUP log_group_departments
  (department_id, department_name, manager_id, location_id, time) ALWAYS;

ALTER TABLE hr.employees ADD SUPPLEMENTAL LOG GROUP log_group_employees
  (employee_id, first_name, last_name, email, phone_number, hire_date, job_id, 
   salary, commission_pct, manager_id, department_id, time) ALWAYS;

ALTER TABLE hr.jobs ADD SUPPLEMENTAL LOG GROUP log_group_jobs
  (job_id, job_title, min_salary, max_salary, time) ALWAYS;

ALTER TABLE hr.job_history ADD SUPPLEMENTAL LOG GROUP log_group_job_history
  (employee_id, start_date, end_date, job_id, department_id, time) ALWAYS;

ALTER TABLE hr.locations ADD SUPPLEMENTAL LOG GROUP log_group_locations
  (location_id, street_address, postal_code, city, state_province, 
   country_id, time) ALWAYS;

ALTER TABLE hr.regions ADD SUPPLEMENTAL LOG GROUP log_group_regions
  (region_id, region_name, time) ALWAYS;

ALTER SYSTEM ARCHIVE LOG CURRENT;

/*

Set the session tag back to NULL at mult2.net.

*/
 
EXEC DBMS_STREAMS.SET_TAG(tag => NULL);

/*

Step 23 Specify Supplemental Logging at mult3.net

Connect to mult3.net as SYS user.

*/
 
CONNECT SYS/CHANGE_ON_INSTALL@mult3.net AS SYSDBA

/*

Set the session tag to a non-NULL value so that the supplemental logging changes are not captured by the capture process at mult3.net.

*/
 
EXEC DBMS_STREAMS.SET_TAG(tag => HEXTORAW('01'));

/*

See Also:

Chapter 8, "Streams Tags"

Specify an unconditional supplemental log group that includes the primary key for each table and the column list for each table, as specified in "Configure Latest Time Conflict Resolution at mult3.net". After this step is complete, users can modify tables in the hr schema at mult3.net.

Note:

See Also:

*/

ALTER TABLE hr.countries ADD SUPPLEMENTAL LOG GROUP log_group_countries
  (country_id, country_name, region_id, time) ALWAYS;

ALTER TABLE hr.departments ADD SUPPLEMENTAL LOG GROUP log_group_departments
  (department_id, department_name, manager_id, location_id, time) ALWAYS;

ALTER TABLE hr.employees ADD SUPPLEMENTAL LOG GROUP log_group_employees
  (employee_id, first_name, last_name, email, phone_number, hire_date, job_id, 
   salary, commission_pct, manager_id, department_id, time) ALWAYS;

ALTER TABLE hr.jobs ADD SUPPLEMENTAL LOG GROUP log_group_jobs
  (job_id, job_title, min_salary, max_salary, time) ALWAYS;

ALTER TABLE hr.job_history ADD SUPPLEMENTAL LOG GROUP log_group_job_history
  (employee_id, start_date, end_date, job_id, department_id, time) ALWAYS;

ALTER TABLE hr.locations ADD SUPPLEMENTAL LOG GROUP log_group_locations
  (location_id, street_address, postal_code, city, state_province, 
   country_id, time) ALWAYS;

ALTER TABLE hr.regions ADD SUPPLEMENTAL LOG GROUP log_group_regions
  (region_id, region_name, time) ALWAYS;

ALTER SYSTEM ARCHIVE LOG CURRENT;

/*

Set the session tag back to NULL at mult2.net.

*/
 
EXEC DBMS_STREAMS.SET_TAG(tag => NULL);

/*

Step 24 Configure Latest Time Conflict Resolution at mult2.net

Connect to mult2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult2.net

/*

*/
 
DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'country_name';
  cols(2) := 'region_id';
  cols(3) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.countries',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'department_name';
  cols(2) := 'manager_id';
  cols(3) := 'location_id';
  cols(4) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.departments',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1)  := 'first_name';
  cols(2)  := 'last_name';
  cols(3)  := 'email';
  cols(4)  := 'phone_number';
  cols(5)  := 'hire_date';
  cols(6)  := 'job_id';
  cols(7)  := 'salary';
  cols(8)  := 'commission_pct';
  cols(9)  := 'manager_id';
  cols(10) := 'department_id';
  cols(11) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.employees',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'job_title';
  cols(2) := 'min_salary';
  cols(3) := 'max_salary';
  cols(4) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.jobs',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'employee_id';
  cols(2) := 'start_date';
  cols(3) := 'end_date';
  cols(4) := 'job_id';
  cols(5) := 'department_id';
  cols(6) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.job_history',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'street_address';
  cols(2) := 'postal_code';
  cols(3) := 'city';
  cols(4) := 'state_province';
  cols(5) := 'country_id';
  cols(6) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.locations',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'region_name';
  cols(2) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.regions',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

/*

Step 25 Start the Apply Processes at mult2.net

Set the disable_on_error parameter to n for both apply processes so that they will not be not disabled if they encounter an error, and start both of the apply processes at mult2.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_from_mult1', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_from_mult1');
END;
/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_from_mult3', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_from_mult3');
END;
/

/*

Step 26 Configure Latest Time Conflict Resolution at mult3.net

Connect to mult3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult3.net

/*

*/
 
DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'country_name';
  cols(2) := 'region_id';
  cols(3) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.countries',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'department_name';
  cols(2) := 'manager_id';
  cols(3) := 'location_id';
  cols(4) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.departments',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1)  := 'first_name';
  cols(2)  := 'last_name';
  cols(3)  := 'email';
  cols(4)  := 'phone_number';
  cols(5)  := 'hire_date';
  cols(6)  := 'job_id';
  cols(7)  := 'salary';
  cols(8)  := 'commission_pct';
  cols(9)  := 'manager_id';
  cols(10) := 'department_id';
  cols(11) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.employees',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'job_title';
  cols(2) := 'min_salary';
  cols(3) := 'max_salary';
  cols(4) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.jobs',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'employee_id';
  cols(2) := 'start_date';
  cols(3) := 'end_date';
  cols(4) := 'job_id';
  cols(5) := 'department_id';
  cols(6) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.job_history',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'street_address';
  cols(2) := 'postal_code';
  cols(3) := 'city';
  cols(4) := 'state_province';
  cols(5) := 'country_id';
  cols(6) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.locations',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

DECLARE
  cols  DBMS_UTILITY.NAME_ARRAY;
BEGIN
  cols(1) := 'region_name';
  cols(2) := 'time';
  DBMS_APPLY_ADM.SET_UPDATE_CONFLICT_HANDLER(
    object_name           =>  'hr.regions',
    method_name           =>  'MAXIMUM',
    resolution_column     =>  'time',
    column_list           =>  cols);
END;
/

/*

Step 27 Start the Apply Processes at mult3.net

Set the disable_on_error parameter to n for both apply processes so that they will not be disabled if they encounter an error, and start both of the apply processes at mult3.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_from_mult1', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_from_mult1');
END;
/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_from_mult2', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_from_mult2');
END;
/

/*

Step 28 Start the Apply Processes at mult1.net

Connect to mult1.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult1.net

/*

Set the disable_on_error parameter to n for both apply processes so that they will not be disabled if they encounter an error, and start both of the apply processes at mult1.net.

*/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_from_mult2', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_from_mult2');
END;
/

BEGIN
  DBMS_APPLY_ADM.SET_PARAMETER(
    apply_name  => 'apply_from_mult3', 
    parameter   => 'disable_on_error', 
    value       => 'n');
END;
/

BEGIN
  DBMS_APPLY_ADM.START_APPLY(
    apply_name  => 'apply_from_mult3');
END;
/

/*

Step 29 Start the Capture Process at mult1.net

Start the capture process at mult1.net.

*/

BEGIN
  DBMS_CAPTURE_ADM.START_CAPTURE(
    capture_name  => 'capture_hr');
END;
/

/*

Step 30 Start the Capture Process at mult2.net

Connect to mult2.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult2.net

/*

Start the capture process at mult2.net.

*/

BEGIN
  DBMS_CAPTURE_ADM.START_CAPTURE(
    capture_name  => 'capture_hr');
END;
/

/*

Step 31 Start the Capture Process at mult3.net

Connect to mult3.net as the strmadmin user.

*/
 
CONNECT strmadmin/strmadminpw@mult3.net

/*

Start the capture process at mult3.net.

*/

BEGIN
  DBMS_CAPTURE_ADM.START_CAPTURE(
    capture_name  => 'capture_hr');
END;
/

SET ECHO OFF

/*

Step 32 Check the Spool Results

Check the streams_mult.out spool file to ensure that all actions finished successfully after this script is completed.

*/

SET ECHO OFF
SPOOL OFF

/*************************** END OF SCRIPT ******************************/

19 Example Streams Replication Environments

Single Source Database in a Heterogeneous Environment

Figure 19-1 Example Environment That Shares Data from a Single Source Database

Prerequisites

Setting Up Users and Creating Queues and Database Links

Step 1 Show Output and Spool Results

Step 2 Alter the hr.countries Table at dbs1.net

Step 3 Set Up Users at dbs1.net

Step 4 Create the Streams Queue at dbs1.net

Step 5 Create the Database Link at dbs1.net

Step 6 Set Up Users at dbs2.net

Step 7 Create the Streams Queue at dbs2.net

Step 8 Create the Database Links at dbs2.net

Step 9 Create the hr.assignments Table at dbs2.net

Step 10 Set Up Users at dbs3.net

Step 11 Create the Streams Queue at dbs3.net

Step 12 Drop All of the Tables in the hr Schema at dbs3.net

Step 13 Check the Spool Results

Example Scripts for Sharing Data from One Database

Simple Configuration for Sharing Data from a Single Database

Step 1 Show Output and Spool Results

Step 2 Create an Alternate Tablespace for the LogMiner Tables at dbs1.net

Step 3 Specify Supplemental Logging at dbs1.net

Step 4 Configure Propagation at dbs1.net

Step 5 Configure the Capture Process at dbs1.net

Step 6 Set the Instantiation SCN for the Existing Tables at Other Databases

Step 7 Instantiate the dbs1.net Tables at dbs3.net

Step 8 Configure the Apply Process at dbs3.net

Step 9 Specify hr as the Apply User for the Apply Process at dbs3.net

Step 10 Grant the hr User Execute Privilege on the Apply Process Rule Set

Step 11 Start the Apply Process at dbs3.net

Step 12 Configure Propagation at dbs2.net

Step 13 Create the Transformation for Row LCRs at dbs2.net

Step 14 Configure the Apply Process for Local Apply at dbs2.net

Step 15 Specify hr as the Apply User for the Apply Process at dbs2.net

Step 16 Grant the hr User Execute Privilege on the Apply Process Rule Set

Step 17 Start the Apply Process at dbs2.net for Local Apply

Step 18 Configure the Apply Process at dbs2.net for Apply at dbs4.net

Step 19 Start the Apply Process at dbs2.net for Apply at dbs4.net

Step 20 Start the Capture Process at dbs1.net

Step 21 Check the Spool Results

Flexible Configuration for Sharing Data from a Single Database

Step 1 Show Output and Spool Results

Step 2 Create an Alternate Tablespace for the LogMiner Tables at dbs1.net

Step 3 Specify Supplemental Logging at dbs1.net

Step 4 Configure Propagation at dbs1.net

Step 5 Configure the Capture Process at dbs1.net

Step 6 Prepare the hr Schema at dbs1.net for Instantiation

Step 7 Set the Instantiation SCN for the Existing Tables at Other Databases

Step 8 Instantiate the dbs1.net Tables at dbs3.net

Step 9 Configure the Apply Process at dbs3.net

Step 10 Grant the hr User Execute Privilege on the Apply Process Rule Set

Step 11 Start the Apply Process at dbs3.net

Step 12 Configure Propagation at dbs2.net

Step 13 Create the Transformation for Row LCRs at dbs2.net

Step 14 Configure the Apply Process for Local Apply at dbs2.net

Step 15 Grant the hr User Execute Privilege on the Apply Process Rule Set

Step 16 Start the Apply Process at dbs2.net for Local Apply

Step 17 Configure the Apply Process at dbs2.net for Apply at dbs4.net

Step 18 Start the Apply Process at dbs2.net for Apply at dbs4.net

Step 19 Start the Capture Process at dbs1.net

Step 20 Check the Spool Results

Adding Objects to an Existing Streams Replication Environment

Figure 19-2 Adding Objects to dbs3.net in the Environment

Step 1 Show Output and Spool Results

Step 2 Stop the Apply Process at dbs3.net

Step 3 Configure the Apply Process for the Added Tables at dbs3.net

Step 4 Specify the Table Propagation Rules for the Added Tables at dbs2.net

Step 5 Prepare the Four Added Tables for Instantiation at dbs1.net

Step 6 Instantiate the dbs1.net Tables at dbs3.net

Step 7 Start the Apply Process at dbs3.net

Step 8 Check the Spool Results

Adding a Database to an Existing Streams Replication Environment

Figure 19-3 Adding the dbs5.net Oracle Database to the Environment

Step 1 Show Output and Spool Results

Step 2 Drop All of the Tables in the hr Schema at dbs5.net

Step 3 Set Up Users at dbs5.net

Step 4 Create the Streams Queue at dbs5.net

Step 5 Configure the Apply Process at dbs5.net

Step 6 Specify hr as the Apply User for the Apply Process at dbs5.net

19
Example Streams Replication Environments