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  Oracle Replication Tips by Burleson

Define the Oracle replication Conflict Resolution Method

Now our replication will function more like a stand-alone database.  If two users modify the same data, the data will be applied in the order of commits.  In our replication, the two transactions will be applied in the order of the timestamp. This is the most common conflict resolution method. 

There is one caveat to consider with this method. All replication database servers must be operating on one time standard.  If you have two servers in your replication scheme, one in Virginia and the other in California, the Virginia server time will be four hours ahead of the California server. 

Normally databases used in a replication environment use a standard time, either GMT or local time at the company headquarters.  It doesn’t matter as long as they are the same.  You can also create the trigger to compensate for the time differences, but you will not be able to replicate the trigger.  Instead, you will need to create the trigger at each site, adjusting for the time.  Since I live in Colorado I use Mountain Time, to convert to GMT, I would change the trigger to convert the time.

:NEW.LAST_UPDATE := NEW_TIME(SYSDATE,'MDT','GMT');

If Oracle was unable to resolve the conflict using the latest timestamp, we could provide an additional resolution method to use.  It’s called the Site Priority method.


This is an excerpt from Oracle Replication By Rampant TechPress (only $19.95).  You can click here to order a copy and get instant access to the code depot:

http://www.rampant-books.com/book_2003_2_replication.htm


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