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Contents → Resolution Database Link Restrictions Distributed Database Administration Site Autonomy Distributed … Mechanism Database Link Name Resolution Name Resolution When the Global Database Name Is Complete Name … Specifying Link Types Creating Private Database
Contents → CONTEXT CREATE CONTROLFILE CREATE DATABASE CREATE DATABASE LINK CREATE DIMENSION CREATE DIRECTORY … CONTEXT DROP DATABASE DROP DATABASE LINK DROP DIMENSION DROP DIRECTORY DROP DISKGROUP DROP FLASHBACK … Conventions What's New in the SQL Language Reference? Oracle Database
DROP DATABASE LINK → Purpose Use the DROP DATABASE LINK statement to remove a database link from the database. See Also … : CREATE DATABASE LINK for information on creating database links Prerequisites A private database … link must be in
Database Link Name Resolution → A global object name is an object specified using a database link. The essential components of a … database link with a name that matches the database name specified in the global object name. For … searches for a database link called orders.us.acme.com. The database
Database Link Restrictions → You cannot perform the following operations using database links: Grant privileges on remote … referential integrity Grant roles to users in a remote database Obtain nondefault roles on a remote … database. For example, if jane connects to the local database and executes a stored procedure that … uses a fixed
CREATE DATABASE LINK → Purpose Use the CREATE DATABASE LINK statement to create a database link. A database link is a … Heterogeneous Services. After you have created a database link, you can use it in SQL statements to … DROP DATABASE LINK
Obtaining Database Role and Database Link Information → local account for the database link connection that corresponds to the in-doubt transaction. out Your … node is a client of other servers. Lists the name of the database link that connects to the remote … node. Lists the owner of the database link for the in-doubt transaction. In this
Procedure for Dropping a Public Database Link → Connect to the local database as a user with the DROP PUBLIC DATABASE LINK privilege. For example … selected. Drop the desired link using the DROP PUBLIC DATABASE LINK statement. For example, enter: DROP PUBLIC DATABASE LINK sales.us.oracle.com;
Procedure for Dropping a Private Database Link → … Drop the desired link using the DROP DATABASE LINK statement. For example, enter: DROP DATABASE LINK sales.us.oracle.com; … Connect to the local database using SQL*Plus. For example, enter: CONNECT scott@local_db Query
Example 2: Creating a Public Fixed User Shared Database Link → The following example connects to the local database as dana and creates a public link to the sales … database (using its net service name sldb ). The link allows a connection to the remote database as … scott and authenticates this user as scott: CONNECT dana@local CREATE SHARED PUBLIC DATABASE
Example 5: Creating a Public Current User Database Link → link to the sales database (using its net service name sldb ). The following statement creates a public … current user database link: CONNECT bart@local CREATE PUBLIC DATABASE LINK sales.division3.acme.com … user. The consequences of this database link
Example 4: Creating a Public Connected User Shared Database Link → The following example connects to the local database as neil and creates a shared, public link to … /password of crazy/horse. The following statement creates a public, connected user, shared database link … : CONNECT neil@local CREATE SHARED PUBLIC DATABASE LINK sales.division3.acme.com
Limiting the Number of Active Database Link Connections → no distributed transactions are allowed. See Also: Oracle Database Reference for more information about the OPEN_LINKS initialization parameter
Example 3: Creating a Public Connected User Database Link → The following example connects to the local database as larry and creates a public link to the … database with the net service name sldb: CONNECT larry@local CREATE PUBLIC DATABASE LINK redwood USING … 'sldb'; Any user connected to the local database can use the redwood database
Example 1: Creating a Public Fixed User Database Link → database link to database sales for scott. The database is accessed through its net service name sldb … : CONNECT jane@local CREATE PUBLIC DATABASE LINK sales.division3.acme.com CONNECT TO scott IDENTIFIED … use the sales.division3.acme.com database link
database link → A named schema object that describes a path from one database to another. Database links are … implicitly used when a reference is made to a global object name in a distributed database.
Specifying Link Users → A database link defines a communication path from one database to another. When an application uses … a database link to access a remote database, Oracle Database establishes a database session in the … database link,
Specifying Link Types → When you create a database link, you must decide who will have access to it. The following sections … describe how to create the three basic types of links: Creating Private Database Links Creating Public Database Links Creating Global Database Links
Database Links → The central concept in distributed database systems is a database link. A database link is a … Database Links Creation of Database Links: Examples Schema Objects and Database Links Database Link Restrictions … connection
Determining Which Link Connections Are Open → You may find it useful to determine which database link connections are currently open in your … . The following views show the database link connections that are currently open in your current … , with one exception: Column Which Views? Description DB_LINK All The name of the database link
Global Database Names in Database Links → To understand how a database link works, you must first understand what a global database name is … . Each database in a distributed database is uniquely identified by its global database name. The … database forms a global database name by prefixing
Names for Database Links → Typically, a database link has the same name as the global database name of the remote database … the database link is also called sales.us.oracle.com. When you set the initialization parameter … GLOBAL_NAMES to TRUE, the database ensures that the name of the database
Types of Database Links → Oracle Database lets you create private, public, and global database links. These basic link types … USER_DB_LINKS Creates link in a specific schema of the local database. Only the owner of a private database link … or PL/SQL subprograms in the schema can use this link
Creation of Database Links: Examples → Create database links using the CREATE DATABASE LINK statement. The table gives examples of SQL … database: SQL Statement Connects To Database Connects As Link Type CREATE DATABASE LINK … connected user CREATE DATABASE LINK
Connected User Database Links → link is that a user referencing the link connects to the remote database as the same user, and … jobs. The ability to use a connected user database link depends on several factors, chief among them … , then the ability to use a connected user link also depends on whether the remote database
Schema Objects and Database Links → After you have created a database link, you can execute SQL statements that access objects on the … remote database. For example, to access remote object emp using database link foo, you can issue … : SELECT * FROM emp@foo; You must also be authorized in the remote database to access
What Are Database Links? → A database link is a pointer that defines a one-way communication path from an Oracle Database … server to another database server. The link pointer is actually defined as an entry in a data dictionary … table. To access the link, you must be connected to the local database
Synonyms for Schema Objects → Oracle Database lets you create synonyms so that you can hide the database link name from the user … . A synonym allows access to a table on a remote database using the same syntax that you would use to … access a table on a local database. For example, assume you issue the following query against a
Why Use Database Links? → , a local user can access a link to a remote database without having to be a user on the remote … of database link users \"Viewing Information About Database Links\" for an explanation of how to hide passwords from non-administrative users … The great advantage of database links is that
Fixed User Database Links → A benefit of a fixed user link is that it connects a user in a primary database to a remote … can create a public database link in joe 's schema that specifies the fixed user scott with … password tiger. If jane uses the fixed user link in a query, then jane is the user on the local database
What Are Shared Database Links? → A shared database link is a link between a local server process and the remote database. The link … database is connected to a remote database through a database link, either database can run in dedicated … Shared server
Current User Database Links → to retrieve data from the hq database. The procedure uses a current user database link, which … current user database link is not accessed from within a stored object, then the current user is … procedure, view, or trigger that accesses a database link, the current user
Naming of Schema Objects Using Database Links → , index, view, synonym, procedure, package, or a database link. global_database_name is the name that … FALSE, in which case any name is acceptable. For example, using a database link to database … .acme.com. For example, you can call the link foo. Then, you can access the remote database
Users of Database Links → When creating the link, you determine which user should connect to the remote database to access … database links: User Type Description Sample Link Creation Syntax Connected user A local user accessing a … database link in which no fixed username and password have been specified. If
Schema Object Name Resolution → issue the following statements using database link hq.acme.com to access objects in the scott and jane … database forms object names hierarchically. For example, the database guarantees that each schema within a … database has a unique name, and that within a schema each object has a unique name. As
References to Database Links → a SQL statement that contains a database link, you can specify the database link name in one of … these forms: The complete database link name as stored in the data dictionary, including the database … , domain, and optional connect_descriptor components. The partial
Creating Shared Database Links → To create a shared database link, use the keyword SHARE D in the CREATE DATABASE LINK statement … : CREATE SHARED DATABASE LINK dblink_name [CONNECT TO username IDENTIFIED BY password]|[CONNECT TO … server processes from clients that masquerade as a database link
Managing Database Links → This section contains the following topics: Closing Database Links Dropping Database Links Limiting the Number of Active Database Link Connections
Creating Database Links → You create a database link with the statement CREATE DATABASE LINK. The statement lets you specify … this information about the database link: The name of the database link The database connect string … stores this information in the
Authentication Through Database Links → : CREATE PUBLIC DATABASE LINK foo USING 'sales'; You create authenticated links by specifying the … CONNECT TO clause, AUTHENTICATED BY clause, or both clauses together in the database link creation … statement. For example, you can issue: CREATE DATABASE LINK sales CONNECT TO scott