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Oracle Database Links

Creating a database link

CONNECT TO remote_username
IDENTIFIED BY remote_password
USING 'tns_service_name';

The remote DB will then be accessible in the following way:

SELECT * FROM MY_TABLE@dblink_name;

To test a database link connection without needing to know any of the object names in the linked database, use the following query:

SELECT * FROM DUAL@dblink_name;

To explicitly specify a domain for the linked database service, the domain name is added to the USING statement. For example:

USING 'tns_service_name.WORLD'

If no domain name is explicitly specified, Oracle uses the domain of the database in which the link is being created.


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