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DB_LINK w/o tnsnames.ora

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A question popped up, which I thought was interesting. How can you create a DB_LINK in Oracle without the DBA changing the tnsnames.ora file? It’s actually quite easy, especially if the DBA sets the TNS address name the same as the instance’s service name or in older databases SID value.

  1. Do the following with the tnsping utility:
    tnsping mohawk

    It should return this when the server’s hostname is mohawk and domain name is techtinker.com:

    TNS Ping Utility for Linux: Version 11.2.0.2.0 - Production on 26-JUL-2016 16:55:58
     
    Copyright (c) 1997, 2011, Oracle.  All rights reserved.
     
    Used parameter files:
     
     
    Used TNSNAMES adapter to resolve the alias
    Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = mohawk.techtinker.com)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = ORCL)))
    OK (10 msec)
  1. You can now create a DB_LINK in another Oracle instance without a tnsnames.ora entry by referencing the type of server connection and service name with the following syntax (please note that you should remove extraneous white space):
    CREATE DATABASE LINK test
      CONNECT TO student IDENTIFIED BY student
      USING '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=mohawk.techtinker.com)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=ORCL)))'

    In an older database version, you may need to refer to the SID, like this:

    CREATE DATABASE LINK test
      CONNECT TO student IDENTIFIED BY student
      USING '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=mohawk.techtinker.com)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SID=ORCL)))'

    Then, you can query a contact table in the remote instance like this:

    SELECT COUNT(*)
    FROM   contact@test;

As always, I hope this helps somebody trying to solve a problem.

Written by maclochlainn

July 26th, 2016 at 6:15 pm

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