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  Oracle Replication Tips by Burleson

Define the Oracle replication Conflict Resolution Method

Next, we define the conflict resolution method for that column group.

execute dbms_repcat.add_update_resolution(
  sname  => ‘PUBS’,
  oname => ‘SALES’,
  column_group => ‘SALES_COLGP’,
  sequence => 1,
  method => ‘LATEST TIMESTAMP’,
  parameter_column_name => ‘ORDER_DATE’);

Now, when a conflict occurs on the column group, the first (and only, for the moment) method of resolution will be the latest date method (defined via the method parameter). The date within the ORDER_DATE column will be used to resolve the conflict. 

If we wanted to define a second method, we could use the same command, but replace the method parameters and change the sequence to equal two.  Oracle will apply the two conflict resolution methods in the sequence order. 

You might have noticed that the above example has limited usefulness, since the order date is likely to remain the same for all transactions.  It would be more useful to compare the transaction execution time, rather than the ORDER_DATE

So let’s alter our replicated object using the procedure dbms_repace.alter_master_repobject, which we call from the master definition site. With this procedure, we will

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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