Describes how to create a database link

Create Table vendor as select * From gyda001 @ qianji

This indicates that there is a @ symbol next to the statement. This is database links, which enables you to use data from another database in one database.

First, assume that you want to use the tnsnames of the dblink database server. the ora file contains the target_db entry, including the server address, port, and service name. The connection is successful through sqlplus user_name @ target_db.

Run the following statement to create a dblink named dblink_name.

Create public database link dblink_name
Connect to user_name
Identified by password using 'target _ db ';

Then you can access the table of user_name on target_db through Table @ dblink_name.