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  Oracle Replication Tips by Burleson

Oracle multi-master replication Conflict Resolution

Establishing conflict resolution is a process of defining rules for Oracle to apply when a conflict is detected.  If the conflict is resolved, the transaction does not end up in the deferred error column group that the resolution method applies to. 

You can have multiple column groups on a table and define a priority for each group.  A column group can consist of all the columns in the table or any subset of those columns.  Once you have created a column group, you can assign one or more conflict resolution methods to it.  Oracle has defined a number of standard conflict resolution methods that will usually meet your needs. The following table provides a list of the different conflict resolution methods Oracle makes available:



Latest Timestamp Value

With the latest timestamp value method, you define a column that contains a date data type to use in comparing multiple transactions.  When a transaction fails because the before image has changed, the column timestamps of the transactions are compared, and if the second transaction is later than the one changing the before image, the second transaction is applied and overlays the current data (which contains the first transaction). 

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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