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Oracle® Database PL/SQL Packages and Types Reference
11g Release 2 (11.2)

Part Number E16760-04
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23 DBMS_AQADM

The DBMS_AQADM package provides procedures to manage Oracle Streams Advanced Queuing (AQ) configuration and administration information.

See Also:

This chapter contains the following topics:


Using DBMS_AQADM

This section contains the following topics.


Constants

When using enumerated constants, such as INFINITE, TRANSACTIONAL, or NORMAL_QUEUE, the symbol must be specified with the scope of the packages defining it. All types associated with the administrative interfaces must be prepended with DBMS_AQADM. For example: DBMS_AQADM.NORMAL_QUEUE.

Table 23-1 Enumerated Types in the Administrative Interface

Parameter Options

retention

0, 1, 2...INFINITE

message_grouping

TRANSACTIONAL, NONE

queue_type

NORMAL_QUEUE, EXCEPTION_QUEUE, NON_PERSISTENT_QUEUE


See Also:

For more information on the Java classes and data structures used in both DBMS_AQ and DBMS_AQADM, see the DBMS_AQ package.

Subprogram Groups

This DBMS_AQADM package is made up of the following subprogram groups:


Queue Table Subprograms

Table 23-2 Queue Table Subprograms

Subprograms Description

ALTER_QUEUE_TABLE Procedure

Alters the existing properties of a queue table

CREATE_QUEUE_TABLE Procedure

Creates a queue table for messages of a predefined type

DROP_QUEUE_TABLE Procedure

Drops an existing queue table

ENABLE_JMS_TYPES Procedure

A precondition for the enqueue of JMS types and XML types

MIGRATE_QUEUE_TABLE Procedure

Upgrades an 8.0-compatible queue table to an 8.1-compatible or higher queue table, or downgrades an 8.1-compatible or higher queue table to an 8.0-compatible queue table

PURGE_QUEUE_TABLE Procedure

Purges messages from queue tables



Privilege Subprograms

Table 23-3 Privilege Subprograms

Subprograms Description

GRANT_QUEUE_PRIVILEGE Procedure

Grants privileges on a queue to users and roles

GRANT_SYSTEM_PRIVILEGE Procedure

Grants Oracle Streams AQ system privileges to users and roles

REVOKE_QUEUE_PRIVILEGE Procedure

Revokes privileges on a queue from users and roles

REVOKE_SYSTEM_PRIVILEGE Procedure

Revokes Oracle Streams AQ system privileges from users and roles



Queue Subprograms

Table 23-4 Queue Subprograms

Subprograms Description

ALTER_QUEUE Procedure

Alters existing properties of a queue

CREATE_NP_QUEUE Procedure

Creates a nonpersistent RAW queue

CREATE_QUEUE Procedure

Creates a queue in the specified queue table

DROP_QUEUE Procedure

Drops an existing queue

QUEUE_SUBSCRIBERS Function

Returns the subscribers to an 8.0-compatible multiconsumer queue in the PL/SQL index by table collection type DBMS_AQADM.AQ$_subscriber_list_t

START_QUEUE Procedure

Enables the specified queue for enqueuing or dequeuing

STOP_QUEUE Procedure

Disables enqueuing or dequeuing on the specified queue



Subscriber Subprograms

Table 23-5 Subscriber Subprograms

Subprograms Description

ADD_SUBSCRIBER Procedure

Adds a default subscriber to a queue

ALTER_SUBSCRIBER Procedure

Alters existing properties of a subscriber to a specified queue

REMOVE_SUBSCRIBER Procedure

Removes a default subscriber from a queue



Notification Subprograms

Table 23-6 Notification Subprograms

Subprograms Description

GET_WATERMARK Procedure

Retrieves the value of watermark set by the SET_WATERMARK Procedure

SET_WATERMARK Procedure

Used for Oracle Streams AQ notification to specify and limit memory use



Propagation Subprograms

Table 23-7 Propagation Subprograms

Subprograms Description

ALTER_PROPAGATION_SCHEDULE Procedure

Alters parameters for a propagation schedule

DISABLE_PROPAGATION_SCHEDULE Procedure

Disables a propagation schedule

ENABLE_PROPAGATION_SCHEDULE Procedure

Enables a previously disabled propagation schedule

SCHEDULE_PROPAGATION Procedure

Schedules propagation of messages from a queue to a destination identified by a specific database link

UNSCHEDULE_PROPAGATION Procedure

Unschedules previously scheduled propagation of messages from a queue to a destination identified by a specific database link

VERIFY_QUEUE_TYPES Procedure

Verifies that the source and destination queues have identical types



Oracle Streams AQ Agent Subprograms

Table 23-8 Oracle Streams AQ Agent Subprograms

Subprograms Description

ALTER_AQ_AGENT Procedure

Alters an agent registered for Oracle Streams AQ Internet access, and an Oracle Streams AQ agent that accesses secure queues

CREATE_AQ_AGENT Procedure

Registers an agent for Oracle Streams AQ Internet access using HTTP/SMTP protocols, and creates an Oracle Streams AQ agent to access secure queues

DISABLE_DB_ACCESS Procedure

Revokes the privileges of a specific database user from an Oracle Streams AQ Internet agent

DROP_AQ_AGENT Procedure

Drops an agent that was previously registered for Oracle Streams AQ Internet access

ENABLE_DB_ACCESS Procedure

Grants an Oracle Streams AQ Internet agent the privileges of a specific database user



Alias Subprograms

Table 23-9 Alias Subprograms

Subprograms Description

ADD_ALIAS_TO_LDAP Procedure

Creates an alias for a queue, agent, or a JMS ConnectionFactory in LDAP

DEL_ALIAS_FROM_LDAP Procedure

Drops an alias for a queue, agent, or JMS ConnectionFactory in LDAP



Summary of DBMS_AQADM Subprograms

Table 23-10 DBMS_AQADM Package Subprograms

Subprograms Description

ADD_ALIAS_TO_LDAP Procedure

Creates an alias for a queue, agent, or a JMS ConnectionFactory in LDAP

ADD_SUBSCRIBER Procedure

Adds a default subscriber to a queue

ALTER_AQ_AGENT Procedure

Alters an agent registered for Oracle Streams AQ Internet access, and an Oracle Streams AQ agent that accesses secure queues

ALTER_PROPAGATION_SCHEDULE Procedure

Alters parameters for a propagation schedule

ALTER_QUEUE Procedure

Alters existing properties of a queue

ALTER_QUEUE_TABLE Procedure

Alters the existing properties of a queue table

ALTER_SUBSCRIBER Procedure

Alters existing properties of a subscriber to a specified queue

CREATE_AQ_AGENT Procedure

Registers an agent for Oracle Streams AQ Internet access using HTTP/SMTP protocols, and creates an Oracle Streams AQ agent to access secure queues

CREATE_NP_QUEUE Procedure

Creates a nonpersistent RAW queue

CREATE_QUEUE Procedure

Creates a queue in the specified queue table

CREATE_QUEUE_TABLE Procedure

Creates a queue table for messages of a predefined type

DEL_ALIAS_FROM_LDAP Procedure

Drops an alias for a queue, agent, or JMS ConnectionFactory in LDAP

DISABLE_DB_ACCESS Procedure

Revokes the privileges of a specific database user from an Oracle Streams AQ Internet agent

DISABLE_PROPAGATION_SCHEDULE Procedure

Disables a propagation schedule

DROP_AQ_AGENT Procedure

Drops an agent that was previously registered for Oracle Streams AQ Internet access

DROP_QUEUE Procedure

Drops an existing queue

DROP_QUEUE_TABLE Procedure

Drops an existing queue table

ENABLE_DB_ACCESS Procedure

Grants an Oracle Streams AQ Internet agent the privileges of a specific database user

ENABLE_JMS_TYPES Procedure

A precondition for the enqueue of JMS types and XML types

ENABLE_PROPAGATION_SCHEDULE Procedure

Enables a previously disabled propagation schedule

GET_WATERMARK Procedure

Retrieves the value of watermark set by the SET_WATERMARK Procedure

GRANT_QUEUE_PRIVILEGE Procedure

Grants privileges on a queue to users and roles

GRANT_SYSTEM_PRIVILEGE Procedure

Grants Oracle Streams AQ system privileges to users and roles

MIGRATE_QUEUE_TABLE Procedure

Upgrades an 8.0-compatible queue table to an 8.1-compatible or higher queue table, or downgrades an 8.1-compatible or higher queue table to an 8.0-compatible queue table

PURGE_QUEUE_TABLE Procedure

Purges messages from queue tables

QUEUE_SUBSCRIBERS Function

Returns the subscribers to an 8.0-compatible multiconsumer queue in the PL/SQL index by table collection type DBMS_AQADM.AQ$_subscriber_list_t

REMOVE_SUBSCRIBER Procedure

Removes a default subscriber from a queue

REVOKE_QUEUE_PRIVILEGE Procedure

Revokes privileges on a queue from users and roles

REVOKE_SYSTEM_PRIVILEGE Procedure

Revokes Oracle Streams AQ system privileges from users and roles

SCHEDULE_PROPAGATION Procedure

Schedules propagation of messages from a queue to a destination identified by a specific database link

SET_WATERMARK Procedure

Used for Oracle Streams AQ notification to specify and limit memory use

START_QUEUE Procedure

Enables the specified queue for enqueuing or dequeuing

STOP_QUEUE Procedure

Disables enqueuing or dequeuing on the specified queue

UNSCHEDULE_PROPAGATION Procedure

Unschedules previously scheduled propagation of messages from a queue to a destination identified by a specific database link

VERIFY_QUEUE_TYPES Procedure

Verifies that the source and destination queues have identical types



ADD_ALIAS_TO_LDAP Procedure

This procedure creates an alias for a queue, agent, or a JMS ConnectionFactory in LDAP. The alias will be placed directly under the database server's distinguished name in LDAP hierarchy.

Syntax

DBMS_AQADM.ADD_ALIAS_TO_LDAP(
   alias          IN VARCHAR2,
   obj_location   IN VARCHAR2);

Parameters

Table 23-11 ADD_ALIAS_TO_LDAP Procedure Parameters

Parameter Description

alias

Name of the alias. Example: west_shipping.

obj_location

The distinguished name of the object (queue, agent or connection factory) to which alias refers.


Usage Notes

This method can be used to create aliases for queues, agents, and JMS ConnectionFactory objects. These object must exist before the alias is created. These aliases can be used for JNDI lookup in JMS and Oracle Streams AQ Internet access.


ADD_SUBSCRIBER Procedure

This procedure adds a default subscriber to a queue.

Syntax

DBMS_AQADM.ADD_SUBSCRIBER (
   queue_name      IN    VARCHAR2,
   subscriber      IN    sys.aq$_agent,
   rule            IN    VARCHAR2 DEFAULT NULL,
   transformation  IN    VARCHAR2 DEFAULT NULL
   queue_to_queue  IN    BOOLEAN DEFAULT FALSE,
   delivery_mode   IN    PLS_INTEGER DEFAULT DBMS_AQADM.PERSISTENT);

Parameters

Table 23-12 ADD_SUBSCRIBER Procedure Parameters

Parameter Description

queue_name

Name of the queue.

subscriber

Agent on whose behalf the subscription is being defined.

rule

A conditional expression based on the message properties, the message data properties and PL/SQL functions. A rule is specified as a Boolean expression using syntax similar to the WHERE clause of a SQL query. This Boolean expression can include conditions on message properties, user data properties (object payloads only), and PL/SQL or SQL functions (as specified in the where clause of a SQL query). Currently supported message properties are priority and corrid.

To specify rules on a message payload (object payload), use attributes of the object type in clauses. You must prefix each attribute with tab.user_data as a qualifier to indicate the specific column of the queue table that stores the payload. The rule parameter cannot exceed 4000 characters.

transformation

Specifies a transformation that will be applied when this subscriber dequeues the message. The source type of the transformation must match the type of the queue. If the subscriber is remote, then the transformation is applied before propagation to the remote queue.

queue_to_queue

If TRUE, propagation is from queue-to-queue.

delivery_mode

The administrator may specify one of DBMS_AQADM.PERSISTENT, DBMS_AQADM.BUFFERED, or DBMS_AQADM.PERSISTENT_OR_BUFFERED for the delivery mode of the messages the subscriber is interested in. This parameter will not be modifiable by ALTER_SUBSCRIBER.


Usage Notes

A program can enqueue messages to a specific list of recipients or to the default list of subscribers. This operation only succeeds on queues that allow multiple consumers. This operation takes effect immediately, and the containing transaction is committed. Enqueue requests that are executed after the completion of this call will reflect the new behavior.

Any string within the rule must be quoted:

rule   => 'PRIORITY <= 3 AND CORRID =  ''FROM JAPAN'''
 

Note that these are all single quotation marks.


ALTER_AQ_AGENT Procedure

This procedure alters an agent registered for Oracle Streams AQ Internet access. It is also used to alter an Oracle Streams AQ agent that accesses secure queues.

See Also:

Oracle Streams Concepts and Administration for information about secure queues

Syntax

DBMS_AQADM.ALTER_AQ_AGENT (
  agent_name                IN VARCHAR2,
  certificate_location      IN VARCHAR2 DEFAULT NULL,
  enable_http               IN BOOLEAN DEFAULT FALSE,
  enable_smtp               IN BOOLEAN DEFAULT FALSE,
  enable_anyp               IN BOOLEAN DEFAULT FALSE )

Parameters

Table 23-13 ALTER_AQ_AGENT Procedure Parameters

Parameter Description

agent_name

Specifies the username of the Oracle Streams AQ Internet agent.

certification_location

Agent's certificate location in LDAP (default is NULL). If the agent is allowed to access Oracle Streams AQ through SMTP, then its certificate must be registered in LDAP. For access through HTTP, the certificate location is not required.

enable_http

TRUE means the agent can access Oracle Streams AQ through HTTP. FALSE means the agent cannot access Oracle Streams AQ through HTTP.

enable_smtp

TRUE means the agent can access Oracle Streams AQ through SMTP (e-mail). FALSE means the agent cannot access Oracle Streams AQ through SMTP.

enable_anyp

TRUE means the agent can access Oracle Streams AQ through any protocol (HTTP or SMTP).



ALTER_PROPAGATION_SCHEDULE Procedure

This procedure alters parameters for a propagation schedule.

Syntax

DBMS_AQADM.ALTER_PROPAGATION_SCHEDULE ( 
   queue_name           IN    VARCHAR2, 
   destination          IN    VARCHAR2 DEFAULT NULL,
   duration             IN    NUMBER   DEFAULT NULL, 
   next_time            IN    VARCHAR2 DEFAULT NULL, 
   latency              IN    NUMBER   DEFAULT 60,
   destination_queue    IN    VARCHAR2 DEFAULT NULL);

Parameters

Table 23-14 ALTER_PROPAGATION_SCHEDULE Procedure Parameters

Parameter Description

queue_name

Name of the source queue whose messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the user.

destination

Destination database link. Messages in the source queue for recipients at this destination are propagated. If it is NULL, then the destination is the local database and messages are propagated to other queues in the local database. The length of this field is currently limited to 128 bytes, and if the name is not fully qualified, then the default domain name is used.

duration

Duration of the propagation window in seconds. A NULL value means the propagation window is forever or until the propagation is unscheduled.

next_time

Date function to compute the start of the next propagation window from the end of the current window. If this value is NULL, then propagation is stopped at the end of the current window. For example, to start the window at the same time every day, next_time should be specified as SYSDATE + 1 - duration/86400.

latency

Maximum wait, in seconds, in the propagation window for a message to be propagated after it is enqueued. The default value is 60. Caution: if latency is not specified for this call, then latency will over-write any existing value with the default value.

For example, if the latency is 60 seconds and there are no messages to be propagated during the propagation window, then messages from that queue for the destination are not propagated for at least 60 more seconds. It will be at least 60 seconds before the queue will be checked again for messages to be propagated for the specified destination. If the latency is 600, then the queue will not be checked for 10 minutes and if the latency is 0, then a job queue process will be waiting for messages to be enqueued for the destination and as soon as a message is enqueued it will be propagated.

destination_queue

Name of the target queue to which messages are to be propagated in the form of a dblink



ALTER_QUEUE Procedure

This procedure alters existing properties of a queue. The parameters max_retries, retention_time, and retry_delay are not supported for nonpersistent queues.

Syntax

DBMS_AQADM.ALTER_QUEUE (
   queue_name        IN    VARCHAR2,
   max_retries       IN    NUMBER   DEFAULT NULL,
   retry_delay       IN    NUMBER   DEFAULT NULL,
   retention_time    IN    NUMBER   DEFAULT NULL,
   auto_commit       IN    BOOLEAN  DEFAULT TRUE,
   comment           IN    VARCHAR2 DEFAULT NULL);

Parameters

Table 23-15 ALTER_QUEUE Procedure Parameters

Parameter Description

queue_name

Name of the queue that is to be altered

max_retries

Limits the number of times a dequeue with REMOVE mode can be attempted on a message. The maximum value of max_retries is 2**31 -1.

A message is moved to an exception queue if RETRY_COUNT is greater than MAX_RETRIES. RETRY_COUNT is incremented when the application issues a rollback after executing the dequeue. If a dequeue transaction fails because the server process dies (including ALTER SYSTEM KILL SESSION) or SHUTDOWN ABORT on the instance, then RETRY_COUNT is not incremented.

Note that max_retries is supported for all single consumer queues and 8.1-compatible or higher multiconsumer queues but not for 8.0-compatible multiconsumer queues.

retry_delay

Delay time in seconds before this message is scheduled for processing again after an application rollback. The default is NULL, which means that the value will not be altered.

Note that retry_delay is supported for single consumer queues and 8.1-compatible or higher multiconsumer queues but not for 8.0-compatible multiconsumer queues.

retention_time

Retention time in seconds for which a message is retained in the queue table after being dequeued. The default is NULL, which means that the value will not be altered.

auto_commit

TRUE causes the current transaction, if any, to commit before the ALTER_QUEUE operation is carried out. The ALTER_QUEUE operation become persistent when the call returns. This is the default. FALSE means the operation is part of the current transaction and becomes persistent only when the caller enters a commit.

Caution: This parameter has been deprecated.

comment

User-specified description of the queue. This user comment is added to the queue catalog. The default value is NULL, which means that the value will not be changed.



ALTER_QUEUE_TABLE Procedure

This procedure alters the existing properties of a queue table.

Syntax

DBMS_AQADM.ALTER_QUEUE_TABLE (
   queue_table          IN   VARCHAR2, 
   comment              IN   VARCHAR2       DEFAULT NULL,
   primary_instance     IN   BINARY_INTEGER DEFAULT NULL, 
   secondary_instance   IN   BINARY_INTEGER DEFAULT NULL);

Parameters

Table 23-16 ALTER_QUEUE_TABLE Procedure Parameters

Parameter Description

queue_table

Name of a queue table to be created.

comment

Modifies the user-specified description of the queue table. This user comment is added to the queue catalog. The default value is NULL which means that the value will not be changed.

primary_instance

This is the primary owner of the queue table. Queue monitor scheduling and propagation for the queues in the queue table will be done in this instance. The default value is NULL, which means that the current value will not be changed.

secondary_instance

The queue table fails over to the secondary instance if the primary instance is not available. The default value is NULL, which means that the current value will not be changed.



ALTER_SUBSCRIBER Procedure

This procedure alters existing properties of a subscriber to a specified queue. Only the rule can be altered.

Syntax

DBMS_AQADM.ALTER_SUBSCRIBER (
   queue_name     IN    VARCHAR2,
   subscriber     IN    sys.aq$_agent,
   rule           IN    VARCHAR2
   transformation IN    VARCHAR2);

Parameters

Table 23-17 ALTER_SUBSCRIBER Procedure Parameters

Parameter Description

queue_name

Name of the queue.

subscriber

Agent on whose behalf the subscription is being altered. See "AQ$_AGENT Type".

rule

A conditional expression based on the message properties, the message data properties and PL/SQL functions. The rule parameter cannot exceed 4000 characters. To eliminate the rule, set the rule parameter to NULL.

transformation

Specifies a transformation that will be applied when this subscriber dequeues the message. The source type of the transformation must match the type of the queue. If the subscriber is remote, then the transformation is applied before propagation to the remote queue.


Usage Notes

This procedure alters both the rule and the transformation for the subscriber. If you want to retain the existing value for either of them, you must specify its old value. The current values for rule and transformation for a subscriber can be obtained from the schema.AQ$queue_table_R and schema.AQ$queue_table_S views.


CREATE_AQ_AGENT Procedure

This procedure registers an agent for Oracle Streams AQ Internet access using HTTP/SMTP protocols. It is also used to create an Oracle Streams AQ agent to access secure queues.

See Also:

Oracle Streams Concepts and Administration for information about secure queues

Syntax

DBMS_AQADM.CREATE_AQ_AGENT (
  agent_name                IN VARCHAR2,
  certificate_location      IN VARCHAR2 DEFAULT NULL,
  enable_http               IN BOOLEAN DEFAULT FALSE,
  enable_smtp               IN BOOLEAN DEFAULT FALSE,
  enable_anyp               IN BOOLEAN DEFAULT FALSE )

Parameters

Table 23-18 CREATE_AQ_AGENT Procedure Parameters

Parameter Description

agent_name

Specifies the username of the Oracle Streams AQ Internet agent.

certification_location

Agent's certificate location in LDAP (default is NULL). If the agent is allowed to access Oracle Streams AQ through SMTP, then its certificate must be registered in LDAP. For access through HTTP, the certificate location is not required.

enable_http

TRUE means the agent can access Oracle Streams AQ through HTTP. FALSE means the agent cannot access Oracle Streams AQ through HTTP.

enable_smtp

TRUE means the agent can access Oracle Streams AQ through SMTP (e-mail). FALSE means the agent cannot access Oracle Streams AQ through SMTP.

enable_anyp

TRUE means the agent can access Oracle Streams AQ through any protocol (HTTP or SMTP).


Usage Notes

The SYS.AQ$INTERNET_USERS view has a list of all Oracle Streams AQ Internet agents.


CREATE_NP_QUEUE Procedure

Note:

nonpersistent queues are deprecated as of Release 10gR2. Oracle recommends using buffered messaging.

This procedure creates a nonpersistent RAW queue.

Syntax

DBMS_AQADM.CREATE_NP_QUEUE ( 
   queue_name              IN        VARCHAR2, 
   multiple_consumers      IN        BOOLEAN  DEFAULT FALSE, 
   comment                 IN        VARCHAR2 DEFAULT NULL);

Parameters

Table 23-19 CREATE_NP_QUEUE Procedure Parameters

Parameter Description

queue_name

Name of the nonpersistent queue that is to be created. The name must be unique within a schema and must follow object name guidelines in Oracle Database SQL Language Reference.

multiple_consumers

FALSE means queues created in the table can only have one consumer for each message. This is the default. TRUE means queues created in the table can have multiple consumers for each message.

Note that this parameter is distinguished at the queue level, because a nonpersistent queue does not inherit this characteristic from any user-created queue table.

comment

User-specified description of the queue. This user comment is added to the queue catalog.


Usage Notes

The queue may be either single-consumer or multiconsumer queue. All queue names must be unique within a schema. The queues are created in a 8.1-compatible or higher system-created queue table (AQ$_MEM_SC or AQ$_MEM_MC) in the same schema as that specified by the queue name.

If the queue name does not specify a schema name, the queue is created in the login user's schema. After a queue is created with CREATE_NP_QUEUE, it can be enabled by calling START_QUEUE. By default, the queue is created with both enqueue and dequeue disabled.

You cannot dequeue from a nonpersistent queue. The only way to retrieve a message from a nonpersistent queue is by using the OCI notification mechanism. You cannot invoke the LISTEN call on a nonpersistent queue.


CREATE_QUEUE Procedure

This procedure creates a queue in the specified queue table.

Syntax

DBMS_AQADM.CREATE_QUEUE (
   queue_name          IN       VARCHAR2,
   queue_table         IN       VARCHAR2,
   queue_type          IN       BINARY_INTEGER DEFAULT NORMAL_QUEUE,
   max_retries         IN       NUMBER         DEFAULT NULL,
   retry_delay         IN       NUMBER         DEFAULT 0,
   retention_time      IN       NUMBER         DEFAULT 0,
   dependency_tracking IN       BOOLEAN        DEFAULT FALSE,
   comment             IN       VARCHAR2       DEFAULT NULL,
   auto_commit         IN       BOOLEAN        DEFAULT TRUE);

Parameters

Table 23-20 CREATE_QUEUE Procedure Parameters

Parameter Description

queue_name

Name of the queue that is to be created. The name must be unique within a schema and must follow object name guidelines in Oracle Database SQL Language Reference with regard to reserved characters.

queue_table

Name of the queue table that will contain the queue.

queue_type

Specifies whether the queue being created is an exception queue or a normal queue. NORMAL_QUEUE means the queue is a normal queue. This is the default. EXCEPTION_QUEUE means it is an exception queue. Only the dequeue operation is allowed on the exception queue.

max_retries

Limits the number of times a dequeue with the REMOVE mode can be attempted on a message. The maximum value of max_retries is 2**31 -1.

A message is moved to an exception queue if RETRY_COUNT is greater than MAX_RETRIES. RETRY_COUNT is incremented when the application issues a rollback after executing the dequeue. If a dequeue transaction fails because the server process dies (including ALTER SYSTEM KILL SESSION) or SHUTDOWN ABORT on the instance, then RETRY_COUNT is not incremented.

Note that max_retries is supported for all single consumer queues and 8.1-compatible or higher multiconsumer queues but not for 8.0-compatible multiconsumer queues.

retry_delay

Delay time, in seconds, before this message is scheduled for processing again after an application rollback.

The default is 0, which means the message can be retried as soon as possible. This parameter has no effect if max_retries is set to 0. Note that retry_delay is supported for single consumer queues and 8.1-compatible or higher multiconsumer queues but not for 8.0-compatible multiconsumer queues.

retention_time

Number of seconds for which a message is retained in the queue table after being dequeued from the queue. INFINITE means the message is retained forever. NUMBER is the number of seconds for which to retain the messages. The default is 0, no retention.

dependency_tracking

Reserved for future use. FALSE is the default. TRUE is not permitted in this release.

comment

User-specified description of the queue. This user comment is added to the queue catalog.

auto_commit

TRUE causes the current transaction, if any, to commit before the CREATE_QUEUE operation is carried out. The CREATE_QUEUE operation becomes persistent when the call returns. This is the default. FALSE means the operation is part of the current transaction and becomes persistent only when the caller enters a commit.

Caution: This parameter has been deprecated.


Usage Notes

All queue names must be unique within a schema. After a queue is created with CREATE_QUEUE, it can be enabled by calling START_QUEUE. By default, the queue is created with both enqueue and dequeue disabled.


CREATE_QUEUE_TABLE Procedure

This procedure creates a queue table for messages of a predefined type.

Syntax

DBMS_AQADM.CREATE_QUEUE_TABLE (
   queue_table          IN      VARCHAR2,
   queue_payload_type   IN      VARCHAR2,
   storage_clause       IN      VARCHAR2        DEFAULT NULL,
   sort_list            IN      VARCHAR2        DEFAULT NULL,
   multiple_consumers   IN      BOOLEAN         DEFAULT FALSE,
   message_grouping     IN      BINARY_INTEGER  DEFAULT NONE,
   comment              IN      VARCHAR2        DEFAULT NULL,
   auto_commit          IN      BOOLEAN         DEFAULT TRUE,
   primary_instance     IN      BINARY_INTEGER  DEFAULT 0, 
   secondary_instance   IN      BINARY_INTEGER  DEFAULT 0,
   compatible           IN      VARCHAR2        DEFAULT NULL,
   secure               IN      BOOLEAN         DEFAULT FALSE);

Parameters

Table 23-21 CREATE_QUEUE_TABLE Procedure Parameters

Parameter Description

queue_table

Name of a queue table to be created

queue_payload_type

Type of the user data stored. See Type Name for valid values for this parameter.

storage_clause

Storage parameter. The storage parameter is included in the CREATE TABLE statement when the queue table is created. The storage_clause argument can take any text that can be used in a standard CREATE TABLE storage_clause argument.The storage parameter can be made up of any combinations of the following parameters: PCTFREE, PCTUSED, INITRANS, MAXTRANS, TABLEPSACE, LOB, and a table storage clause.

If a tablespace is not specified here, then the queue table and all its related objects are created in the default user tablespace. If a tablespace is specified here, then the queue table and all its related objects are created in the tablespace specified in the storage clause. See Oracle Database SQL Language Reference for the usage of these parameters.

sort_list

The columns to be used as the sort key in ascending order. This parameter has the following format:

'sort_column_1,sort_column_2'

The allowed column names are priority and enq_time. If both columns are specified, then sort_column_1 defines the most significant order.

After a queue table is created with a specific ordering mechanism, all queues in the queue table inherit the same defaults. The order of a queue table cannot be altered after the queue table has been created.

If no sort list is specified, then all the queues in this queue table are sorted by the enqueue time in ascending order. This order is equivalent to FIFO order.

Even with the default ordering defined, a dequeuer is allowed to choose a message to dequeue by specifying its msgid or correlation. msgid, correlation, and sequence_deviation take precedence over the default dequeueing order, if they are specified.

multiple_consumers

FALSE means queues created in the table can only have one consumer for each message. This is the default. TRUE means queues created in the table can have multiple consumers for each message.

message_grouping

Message grouping behavior for queues created in the table. NONE means each message is treated individually. TRANSACTIONAL means messages enqueued as part of one transaction are considered part of the same group and can be dequeued as a group of related messages.

comment

User-specified description of the queue table. This user comment is added to the queue catalog.

auto_commit

TRUE causes the current transaction, if any, to commit before the CREATE_QUEUE_TABLE operation is carried out. The CREATE_QUEUE_TABLE operation becomes persistent when the call returns. This is the default. FALSE means the operation is part of the current transaction and becomes persistent only when the caller enters a commit.

Note: This parameter has been deprecated.

primary_instance

The primary owner of the queue table. Queue monitor scheduling and propagation for the queues in the queue table are done in this instance.

The default value for primary instance is 0, which means queue monitor scheduling and propagation will be done in any available instance.

secondary_instance

The queue table fails over to the secondary instance if the primary instance is not available. The default value is 0, which means that the queue table will fail over to any available instance.

compatible

The lowest database version with which the queue is compatible. Currently the possible values are either 8.0, 8.1, or 10.0. If the database is in 10.1-compatible mode, the default value is 10.0. If the database is in 8.1-compatible or 9.2-compatible mode, the default value is 8.1. If the database is in 8.0 compatible mode, the default value is 8.0.

secure

This parameter must be set to TRUE if you want to use the queue table for secure queues. Secure queues are queues for which AQ agents must be associated explicitly with one or more database users who can perform queue operations, such as enqueue and dequeue. The owner of a secure queue can perform all queue operations on the queue, but other users cannot perform queue operations on a secure queue, unless they are configured as secure queue users.


Usage Notes

The sort keys for dequeue ordering, if any, must be defined at table creation time. The following objects are created at this time:

For 8.1-compatible or higher queue tables, the following index-organized tables are created:

aq$_queue_table_name_h, an index-organized table for storing the dequeue history data

CLOB, BLOB, and BFILE are valid attributes for Oracle Streams AQ object type payloads. However, only CLOB and BLOB can be propagated using Oracle Streams AQ propagation in Oracle8i release 8.1.5 or later. See the Oracle Streams Advanced Queuing User's Guide for more information.

The default value of the compatible parameter depends on the database compatibility mode in the init.ora. If the database is in 10.1-compatible mode, the default value is 10.0. If the database is in 8.1-compatible or 9.2-compatible mode, the default value is 8.1. If the database is in 8.0 compatible mode, the default value is 8.0

You can specify and modify the primary_instance and secondary_instance only in 8.1-compatible or higher mode. You cannot specify a secondary instance unless there is a primary instance.


DEL_ALIAS_FROM_LDAP Procedure

This procedure drops an alias for a queue, agent, or JMS ConnectionFactory in LDAP.

Syntax

DBMS_AQ.DEL_ALIAS_FROM_LDAP(
   alias IN VARCHAR2);

Parameters

Table 23-22 DEL_ALIAS_FROM_LDAP Procedure Parameters

Parameter Description

alias

The alias to be removed.



DISABLE_DB_ACCESS Procedure

This procedure revokes the privileges of a specific database user from an Oracle Streams AQ Internet agent.

Syntax

DBMS_AQADM.DISABLE_DB_ACCESS (
  agent_name                IN VARCHAR2,
  db_username               IN VARCHAR2)

Parameters

Table 23-23 DISABLE_DB_ACCESS Procedure Parameters

Parameter Description

agent_name

Specifies the username of the Oracle Streams AQ Internet agent.

db_username

Specifies the database user whose privileges are to be revoked from the Oracle Streams AQ Internet agent.


Usage Notes

The Oracle Streams AQ Internet agent should have been previously granted those privileges using the ENABLE_DB_ACCESS Procedure.


DISABLE_PROPAGATION_SCHEDULE Procedure

This procedure disables a propagation schedule.

Syntax

DBMS_AQADM.DISABLE_PROPAGATION_SCHEDULE ( 
   queue_name            IN   VARCHAR2, 
   destination           IN   VARCHAR2 DEFAULT NULL,
   destination_queue  IN  VARCHAR2 DEFAULT NULL);

Parameters

Table 23-24 DISABLE_PROPAGATION_SCHEDULE Procedure Parameters

Parameter Description

queue_name

Name of the source queue whose messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the user.

destination

Destination database link. Messages in the source queue for recipients at this destination are propagated. If it is NULL, then the destination is the local database and messages are propagated to other queues in the local database. The length of this field is currently limited to 128 bytes, and if the name is not fully qualified, then the default domain name is used.

destination_queue

Name of the target queue to which messages are to be propagated in the form of a dblink



DROP_AQ_AGENT Procedure

This procedure drops an agent that was previously registered for Oracle Streams AQ Internet access.

Syntax

DBMS_AQADM.DROP_AQ_AGENT (
  agent_name                IN VARCHAR2)

Parameters

Table 23-25 DROP_AQ_AGENT Procedure Parameters

Parameter Description

agent_name

Specifies the username of the Oracle Streams AQ Internet agent



DROP_QUEUE Procedure

This procedure drops an existing queue.

Syntax

DBMS_AQADM.DROP_QUEUE (
   queue_name        IN    VARCHAR2,
   auto_commit       IN    BOOLEAN DEFAULT TRUE);

Parameters

Table 23-26 DROP_QUEUE Procedure Parameters

Parameter Description

queue_name

Name of the queue that is to be dropped.

auto_commit

TRUE causes the current transaction, if any, to commit before the DROP_QUEUE operation is carried out. The DROP_QUEUE operation becomes persistent when the call returns. This is the default. FALSE means the operation is part of the current transaction and becomes persistent only when the caller enters a commit.

Caution: This parameter has been deprecated.


Usage Notes

DROP_QUEUE is not allowed unless STOP_QUEUE has been called to disable the queue for both enqueuing and dequeuing. All the queue data is deleted as part of the drop operation.


DROP_QUEUE_TABLE Procedure

This procedure drops an existing queue table.

Syntax

DBMS_AQADM.DROP_QUEUE_TABLE (
   queue_table       IN    VARCHAR2,
   force             IN    BOOLEAN DEFAULT FALSE,
   auto_commit       IN    BOOLEAN DEFAULT TRUE);

Parameters

Table 23-27 DROP_QUEUE_TABLE Procedure Parameters

Parameter Description

queue_table

Name of a queue table to be dropped.

force

FALSE means the operation does not succeed if there are any queues in the table. This is the default. TRUE means all queues in the table are stopped and dropped automatically.

auto_commit

TRUE causes the current transaction, if any, to commit before the DROP_QUEUE_TABLE operation is carried out. The DROP_QUEUE_TABLE operation becomes persistent when the call returns. This is the default. FALSE means the operation is part of the current transaction and becomes persistent only when the caller enters a commit.

Caution: This parameter has been deprecated.


Usage Notes

All the queues in a queue table must be stopped and dropped before the queue table can be dropped. You must do this explicitly unless the force option is used, in which case this is done automatically.


ENABLE_DB_ACCESS Procedure

This procedure grants an Oracle Streams AQ Internet agent the privileges of a specific database user.

Syntax

DBMS_AQADM.ENABLE_DB_ACCESS (
  agent_name                IN VARCHAR2,
  db_username               IN VARCHAR2)

Parameters

Table 23-28 ENABLE_DB_ACCESS Procedure Parameters

Parameter Description

agent_name

Specifies the username of the Oracle Streams AQ Internet agent.

db_username

Specified the database user whose privileges are to be granted to the Oracle Streams AQ Internet agent.


Usage Notes

The Oracle Streams AQ Internet agent should have been previously created using the CREATE_AQ_AGENT Procedure.

For secure queues, the sender and receiver agent of the message must be mapped to the database user performing the enqueue or dequeue operation.

See Also:

Oracle Streams Concepts and Administration for information about secure queues

The SYS.AQ$INTERNET_USERS view has a list of all Oracle Streams AQ Internet agents and the names of the database users whose privileges are granted to them.


ENABLE_JMS_TYPES Procedure

Enqueue of JMS types and XML types does not work with Oracle Streams Sys.Anydata queues unless you call this procedure after DBMS_STREAMS_ADM.SET_UP_QUEUE. Enabling an Oracle Streams queue for these types may affect import/export of the queue table.

Syntax

DBMS_AQADM.ENABLE_JMS_TYPES (
   queue_table   IN   VARCHAR2);

Parameters

Table 23-29 ENABLE_JMS_TYPES Procedure Parameters

Parameter Description

queue_table

Specifies name of the queue table to be enabled for JMS and XML types.



ENABLE_PROPAGATION_SCHEDULE Procedure

This procedure enables a previously disabled propagation schedule.

Syntax

DBMS_AQADM.ENABLE_PROPAGATION_SCHEDULE ( 
   queue_name         IN   VARCHAR2, 
   destination        IN   VARCHAR2 DEFAULT NULL,
   destination_queue  IN   VARCHAR2  DEFAULT NULL);

Parameters

Table 23-30 ENABLE_PROPAGATION_SCHEDULE Procedure Parameters

Parameter Description

queue_name

Name of the source queue whose messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the user.

destination

Destination database link. Messages in the source queue for recipients at this destination are propagated. If it is NULL, then the destination is the local database and messages are propagated to other queues in the local database. The length of this field is currently limited to 128 bytes, and if the name is not fully qualified, then the default domain name is used.

destination_queue

Name of the target queue to which messages are to be propagated in the form of a dblink



GET_WATERMARK Procedure

This procedure retrieves the value of watermark set by SET_WATERMARK.

Syntax

DBMS_AQADM.GET_WATERMARK (
   wmvalue     OUT      NUMBER);

Parameters

Table 23-31 GET_WATERMARK Procedure Parameter

Parameter Description

wmvalue

Watermark value in megabytes.



GRANT_QUEUE_PRIVILEGE Procedure

This procedure grants privileges on a queue to users and roles. The privileges are ENQUEUE or DEQUEUE. Initially, only the queue table owner can use this procedure to grant privileges on the queues.

Syntax

DBMS_AQADM.GRANT_QUEUE_PRIVILEGE (
   privilege        IN    VARCHAR2,
   queue_name       IN    VARCHAR2,
   grantee          IN    VARCHAR2,
   grant_option     IN    BOOLEAN := FALSE);

Parameters

Table 23-32 GRANT_QUEUE_PRIVILEGE Procedure Parameters

Parameter Description

privilege

The Oracle Streams AQ queue privilege to grant. The options are ENQUEUE, DEQUEUE, and ALL. ALL means both ENQUEUE and DEQUEUE.

queue_name

Name of the queue.

grantee

Grantee(s). The grantee(s) can be a user, a role, or the PUBLIC role.

grant_option

Specifies if the access privilege is granted with the GRANT option or not. If the privilege is granted with the GRANT option, then the grantee is allowed to use this procedure to grant the access privilege to other users or roles, regardless of the ownership of the queue table. The default is FALSE.



GRANT_SYSTEM_PRIVILEGE Procedure

This procedure grants Oracle Streams AQ system privileges to users and roles. The privileges are ENQUEUE_ANY, DEQUEUE_ANY, and MANAGE_ANY. Initially, only SYS and SYSTEM can use this procedure successfully.

Syntax

DBMS_AQADM.GRANT_SYSTEM_PRIVILEGE (
   privilege         IN    VARCHAR2,
   grantee           IN    VARCHAR2,
   admin_option      IN    BOOLEAN := FALSE);

Parameters

Table 23-33 GRANT_SYSTEM_PRIVILEGE Procedure Parameters

Parameter Description

privilege

The Oracle Streams AQ system privilege to grant. The options are ENQUEUE_ANY, DEQUEUE_ANY, and MANAGE_ANY. ENQUEUE_ANY means users granted this privilege are allowed to enqueue messages to any queues in the database. DEQUEUE_ANY means users granted this privilege are allowed to dequeue messages from any queues in the database. MANAGE_ANY means users granted this privilege are allowed to run DBMS_AQADM calls on any schemas in the database.

grantee

Grantee(s). The grantee(s) can be a user, a role, or the PUBLIC role.

admin_option

Specifies if the system privilege is granted with the ADMIN option or not.

If the privilege is granted with the ADMIN option, then the grantee is allowed to use this procedure to grant the system privilege to other users or roles. The default is FALSE.



MIGRATE_QUEUE_TABLE Procedure

This procedure upgrades an 8.0-compatible queue table to an 8.1-compatible or higher queue table, or downgrades an 8.1-compatible or higher queue table to an 8.0-compatible queue table.

Syntax

DBMS_AQADM.MIGRATE_QUEUE_TABLE (
   queue_table   IN   VARCHAR2,
   compatible    IN   VARCHAR2);

Parameters

Table 23-34 MIGRATE_QUEUE_TABLE Procedure Parameters

Parameter Description

queue_table

Specifies name of the queue table to be migrated.

compatible

Set this to 8.1 to upgrade an 8.0-compatible queue table, or set this to 8.0 to downgrade an 8.1-compatible queue table.



PURGE_QUEUE_TABLE Procedure

This procedure purges messages from queue tables. You can perform various purge operations on both single-consumer and multiconsumer queue tables for persistent and buffered messages.

Syntax

DBMS_AQADM.PURGE_QUEUE_TABLE(
   queue_table        IN   VARCHAR2,
   purge_condition    IN   VARCHAR2,
   purge_options      IN   aq$_purge_options_t);

where type aq$_purge_options_t is described in Chapter 242, "Oracle Streams AQ TYPEs".

Parameters

Table 23-35 PURGE_QUEUE_TABLE Procedure Parameters

Parameter Description

queue_table

Specifies the name of the queue table to be purged.

purge_condition

Specifies the purge condition to use when purging the queue table. The purge condition must be in the format of a SQL WHERE clause, and it is case-sensitive. The condition is based on the columns of aq$queue_table_name view.

When specifying the purge_condition, qualify the column names in aq$queue_table_name view with qtview.

To purge all queues in a queue table, set purge_condition to either NULL (a bare null word, no quotes) or'' (two single quotes).

purge_options

Type aq$_purge_options_t contains a block parameter and a delivery_mode parameter.

  • If block is TRUE, then an exclusive lock on all the queues in the queue table is held while purging the queue table. This will cause concurrent enqueuers and dequeuers to block while the queue table is purged. The purge call always succeeds if block is TRUE. The default for block is FALSE. This will not block enqueuers and dequeuers, but it can cause the purge to fail with an error during high concurrency times.

  • delivery_mode is used to specify whether DBMS_AQADM.PERSISTENT, DBMS_AQADM.BUFFERED or DBMS_AQADM.PERSISTENT_OR_BUFFERED types of messages are to be purged. You cannot implement arbitrary purge conditions if buffered messages have to be purged.


Usage Notes


QUEUE_SUBSCRIBERS Function

This function returns the subscribers to an 8.0-compatible multiconsumer queue in the PL/SQL index by table collection type DBMS_AQADM.AQ$_subscriber_list_t. Each element of the collection is of type sys.aq$_agent. This functionality is provided for 8.1-compatible queues by the AQ$queue_table_name_S view.

Syntax

DBMS_AQADM.QUEUE_SUBSCRIBERS (
   queue_name         IN         VARCHAR2);
RETURN aq$_subscriber_list_t IS

Parameters

Table 23-36 QUEUE_SUBSCRIBERS Function Parameters

Parameter Description

queue_name

Specifies the queue whose subscribers are to be printed.



REMOVE_SUBSCRIBER Procedure

This procedure removes a default subscriber from a queue. This operation takes effect immediately, and the containing transaction is committed. All references to the subscriber in existing messages are removed as part of the operation.

Syntax

DBMS_AQADM.REMOVE_SUBSCRIBER (
   queue_name         IN         VARCHAR2,
   subscriber         IN         sys.aq$_agent);

Parameters

Table 23-37 REMOVE_SUBSCRIBER Procedure Parameters

Parameter Description

queue_name

Name of the queue.

subscriber

Agent who is being removed. See AQ$_AGENT Type.



REVOKE_QUEUE_PRIVILEGE Procedure

This procedure revokes privileges on a queue from users and roles. The privileges are ENQUEUE or DEQUEUE.

Syntax

DBMS_AQADM.REVOKE_QUEUE_PRIVILEGE (
   privilege         IN      VARCHAR2,
   queue_name        IN      VARCHAR2,
   grantee           IN      VARCHAR2);

Parameters

Table 23-38 REVOKE_QUEUE_PRIVILEGE Procedure Parameters

Parameter Description

privilege

The Oracle Streams AQ queue privilege to revoke. The options are ENQUEUE, DEQUEUE, and ALL. ALL means both ENQUEUE and DEQUEUE.

queue_name

Name of the queue.

grantee

Grantee(s). The grantee(s) can be a user, a role, or the PUBLIC role. If the privilege has been propagated by the grantee through the GRANT option, then the propagated privilege is also revoked.


Usage Notes

To revoke a privilege, the revoker must be the original grantor of the privilege. The privileges propagated through the GRANT option are revoked if the grantor's privileges are revoked.


REVOKE_SYSTEM_PRIVILEGE Procedure

This procedure revokes Oracle Streams AQ system privileges from users and roles. The privileges are ENQUEUE_ANY, DEQUEUE_ANY and MANAGE_ANY. The ADMIN option for a system privilege cannot be selectively revoked.

Syntax

DBMS_AQADM.REVOKE_SYSTEM_PRIVILEGE (
   privilege         IN   VARCHAR2,
   grantee           IN   VARCHAR2);

Parameters

Table 23-39 REVOKE_SYSTEM_PRIVILEGE Procedure Parameters

Parameter Description

privilege

The Oracle Streams AQ system privilege to revoke. The options are ENQUEUE_ANY, DEQUEUE_ANY, and MANAGE_ANY. The ADMIN option for a system privilege cannot be selectively revoked.

grantee

Grantee(s). The grantee(s) can be a user, a role, or the PUBLIC role.



SCHEDULE_PROPAGATION Procedure

This procedure schedules propagation of messages from a queue to a destination identified by a specific database link.

Syntax

DBMS_AQADM.SCHEDULE_PROPAGATION (
   queue_name          IN    VARCHAR2,
   destination         IN    VARCHAR2 DEFAULT NULL,
   start_time          IN    DATE     DEFAULT SYSDATE,
   duration            IN    NUMBER   DEFAULT NULL,
   next_time           IN    VARCHAR2 DEFAULT NULL,
   latency             IN    NUMBER   DEFAULT 60,
   destination_queue   IN    VARCHAR2 DEFAULT NULL);

Parameters

Table 23-40 SCHEDULE_PROPAGATION Procedure Parameters

Parameter Description

queue_name

Name of the source queue whose messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the administrative user.

destination

Destination database link. Messages in the source queue for recipients at this destination are propagated. If it is NULL, then the destination is the local database and messages are propagated to other queues in the local database. The length of this field is currently limited to 128 bytes, and if the name is not fully qualified, then the default domain name is used.

start_time

Initial start time for the propagation window for messages from the source queue to the destination.

duration

Duration of the propagation window in seconds. A NULL value means the propagation window is forever or until the propagation is unscheduled.

next_time

Date function to compute the start of the next propagation window from the end of the current window. If this value is NULL, then propagation is stopped at the end of the current window. For example, to start the window at the same time every day, next_time should be specified as SYSDATE + 1 - duration/86400.

latency

Maximum wait, in seconds, in the propagation window for a message to be propagated after it is enqueued.

For example, if the latency is 60 seconds and there are no messages to be propagated during the propagation window, then messages from that queue for the destination are not propagated for at least 60 more seconds.

It is at least 60 seconds before the queue is checked again for messages to be propagated for the specified destination. If the latency is 600, then the queue is not checked for 10 minutes, and if the latency is 0, then a job queue process will be waiting for messages to be enqueued for the destination. As soon as a message is enqueued, it is propagated.

destination_queue

Name of the target queue to which messages are to be propagated in the form of a dblink


Usage Notes

Messages may also be propagated to other queues in the same database by specifying a NULL destination. If a message has multiple recipients at the same destination in either the same or different queues, the message is propagated to all of them at the same time.


SET_WATERMARK Procedure

This procedure is used for Oracle Streams AQ notification to specify and limit memory use.

Syntax

DBMS_AQADM.SET_WATERMARK (
   wmvalue     IN      NUMBER);

Parameters

Table 23-41 SET_WATERMARK Procedure Parameter

Parameter Description

wmvalue

Watermark value in megabytes.



START_QUEUE Procedure

This procedure enables the specified queue for enqueuing or dequeuing.

Syntax

DBMS_AQADM.START_QUEUE ( 
   queue_name      IN     VARCHAR2,
   enqueue         IN     BOOLEAN DEFAULT TRUE,
   dequeue         IN     BOOLEAN DEFAULT TRUE);

Parameters

Table 23-42 START_QUEUE Procedure Parameters

Parameter Description

queue_name

Name of the queue to be enabled

enqueue

Specifies whether ENQUEUE should be enabled on this queue. TRUE means enable ENQUEUE. This is the default. FALSE means do not alter the current setting.

dequeue

Specifies whether DEQUEUE should be enabled on this queue. TRUE means enable DEQUEUE. This is the default. FALSE means do not alter the current setting.


Usage Notes

After creating a queue, the administrator must use START_QUEUE to enable the queue. The default is to enable it for both ENQUEUE and DEQUEUE. Only dequeue operations are allowed on an exception queue. This operation takes effect when the call completes and does not have any transactional characteristics.


STOP_QUEUE Procedure

This procedure disables enqueuing or dequeuing on the specified queue.

Syntax

DBMS_AQADM.STOP_QUEUE (   
   queue_name      IN   VARCHAR2,
   enqueue         IN   BOOLEAN DEFAULT TRUE,
   dequeue         IN   BOOLEAN DEFAULT TRUE,
   wait            IN   BOOLEAN DEFAULT TRUE);

Parameters

Table 23-43 STOP_QUEUE Procedure Parameters

Parameter Description

queue_name

Name of the queue to be disabled

enqueue

Specifies whether ENQUEUE should be disabled on this queue. TRUE means disable ENQUEUE. This is the default. FALSE means do not alter the current setting.

dequeue

Specifies whether DEQUEUE should be disabled on this queue. TRUE means disable DEQUEUE. This is the default. FALSE means do not alter the current setting.

wait

Specifies whether to wait for the completion of outstanding transactions. TRUE means wait if there are any outstanding transactions. In this state no new transactions are allowed to enqueue to or dequeue from this queue. FALSE means return immediately either with a success or an error.


Usage Notes

By default, this call disables both ENQUEUE and DEQUEUE. A queue cannot be stopped if there are outstanding transactions against the queue. This operation takes effect when the call completes and does not have any transactional characteristics.


UNSCHEDULE_PROPAGATION Procedure

This procedure unschedules previously scheduled propagation of messages from a queue to a destination identified by a specific database link.

Syntax

DBMS_AQADM.UNSCHEDULE_PROPAGATION (
   queue_name         IN  VARCHAR2,
   destination        IN  VARCHAR2 DEFAULT NULL
   destination_queue  IN  VARCHAR2 DEFAULT NULL);

Parameters

Table 23-44 UNSCHEDULE_PROPAGATION Procedure Parameters

Parameter Description

queue_name

Name of the source queue whose messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the administrative user.

destination

Destination database link. Messages in the source queue for recipients at this destination are propagated. If it is NULL, then the destination is the local database and messages are propagated to other queues in the local database. The length of this field is currently limited to 128 bytes, and if the name is not fully qualified, then the default domain name is used.

destination_queue

Name of the target queue to which messages are to be propagated in the form of a dblink



VERIFY_QUEUE_TYPES Procedure

This procedure verifies that the source and destination queues have identical types. The result of the verification is stored in the table sys.aq$_message_types, overwriting all previous output of this command.

Syntax

DBMS_AQADM.VERIFY_QUEUE_TYPES (
   src_queue_name    IN    VARCHAR2,
   dest_queue_name   IN    VARCHAR2,
   destination       IN    VARCHAR2 DEFAULT NULL,
   rc                OUT   BINARY_INTEGER);

Parameters

Table 23-45 VERIFY_QUEUE_TYPES Procedure Parameters

Parameter Description

src_queue_name

Name of the source queue whose messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the user.

dest_queue_name

Name of the destination queue where messages are to be propagated, including the schema name. If the schema name is not specified, then it defaults to the schema name of the user.

destination

Destination database link. Messages in the source queue for recipients at this destination are propagated. If it is NULL, then the destination is the local database and messages are propagated to other queues in the local database. The length of this field is currently limited to 128 bytes, and if the name is not fully qualified, then the default domain name is used.

rc

Return code for the result of the procedure. If there is no error, and if the source and destination queue types match, then the result is 1. If they do not match, then the result is 0. If an Oracle error is encountered, then it is returned in rc.