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Partial database replication setup

Brian Peasland EXPERT RESPONSE FROM: Brian Peasland

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QUESTION POSED ON: 18 July 2006
I am interested in setting up a partial replication from one database to another. I have never done this before and would like some assistance in setting this up. Thanks.

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EXPERT RESPONSE
Oracle has a product called Replication Services which performs this type of replication. This product costs additional funds which may not be justifiable for replicating a small subset of your database. If that is the case, then you can write your own replication routines using database triggers and database links.
  1. Create the database link to the remote database: 
    CREATE DATABASE LINK link_name CONNECT TO 
username IDENTIFIED BY password USING 'tns_alias';
  2. Create a trigger on the table which populates newly inserted rows into the remote database table. 
    CREATE TRIGGER my_table_insert_trig
BEFORE INSERT ON my_table
BEGIN
   INSERT INTO my_table@link_name VALUES 
   (:new.colA, :new.colB, ..., :new.colX);
END;
/
You'll have to create your own triggers similar to the above which perform your replication for you.


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