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  Oracle Replication Tips by Burleson

Oracle materialized view conflict resolution

differentiate authors with the same name, like Robert Smith. 

Oracle’s replication uses this primary key to identify unique rows at all sites containing that table.  What about tables without primary keys?  All tables in the replication environment contain a key that replication uses to uniquely identify rows across the separate master sites.

Remember, when you created the master group at the master definition site, all tables that did not have a primary key had to have a column or columns identified that uniquely identified rows.  Using the SET COLUMNS procedure, you created a key for Oracle to use in replication. Conflicts happen when data is propagated that violates the key.

To greatly increase the efficiency of replication, Oracle propagates transactions on a schedule.  All sites that allow updates, such as updatable Materialized Views and master sites, will insure that the keys used for replication are not violated.  When a row is inserted into a table, the local key is checked, and if the data violates the key, the insert is refused.  If the data does not violate the key, it is inserted into the table and the change passes to the deferred transaction queue. 

During a push, the data is propagated to other master site deferred transaction queues where the receiver applies them.  If the receiver detects that the data violates the key on the local site, it will refuse the transaction and place it in the deferred error queue.  This is an example of a conflict.  The data is applied at one

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:

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