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  Oracle Replication Tips by Burleson

Oracle multi-master replication Conflict Resolution

METHOD NAME DESCRIPTION

Earliest Timestamp Value

This is the opposite of the above method.  The method is available but rarely used.

Minimum Value, Maximum Value  

When a column group has a conflict between two transactions, the minimum value method evaluates the current and new values of a defined column and selects the lower (or higher for maximum) values to determine if the new columns are applied. 

Group Priority Value

In this case, column groups are assigned a priority and conflicts are adjudicated to the highest priority group.

Site Priority Value

In this instance, sites are assigned a priority.  When two transactions conflict, the transaction from the master site with the highest priority will be applied.  This is actually a special case of the Group Priority Value method above.


Conflict Resolution never performs a rollback of a transaction.  Since all master sites will contain the same resolution methods, each site should apply the same transactions.  If transaction A overwrites transaction B, the site that originally creates transaction B will eventually overwrite it with transaction A.  Since all

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