Create a Database Link

 

In many cases you might need to compare data between tables across different databases. For example your test instance and production instance.

You can easily create a database link between the 2 instances and be able to access the production data from the test database.

CREATE DATABASE LINK <Link Name>
 CONNECT TO <Schema Name>
 IDENTIFIED BY <PWD>
 USING '(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = <Host Name>)(PORT = <port#>))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = <Database Name>)
    )
  )';

转载于:https://www.cnblogs.com/GoDevil/archive/2008/08/07/1262748.html