Oracle Database Links

Creating a database link

CREATE DATABASE LINK dblink_name
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.

Conclusion

In this page (written and validated by A. Gawali) you learned about Oracle Database Links . What's Next? If you are interested in completing Oracle tutorial, your next topic will be learning about: Oracle Table partitioning.

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