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  Oracle Replication Tips by Burleson

Oracle materialized view conflict resolution

master site but cannot be applied at another site.  At this point, the replicated tables no longer contain the same data.

Key conflicts are just one possible type of replication conflict.  When a receiver applies a transaction from the deferred transaction queue, it checks the before image to insure that the table data is still the same.  What happens when one row of data is updated at two remote sites at the same time?  The first update propagates normally and is applied, the second update follows and, because it expects the before image to be the original data, it fails to be applied.  The before image is changed by the first update.  This is called an update conflict. 

A delete conflict is similar; one site updates a row while another site deletes the row.  If the update propagates first, the delete fails because the before image does not match.  If the delete propagates first, the row no longer exists when the update is applied.  As you can see, getting your replication environment to function is just the beginning.  To keep it operating, you need to plan for conflict avoidance and apply a method of conflict resolution.


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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