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  Oracle Replication Tips by Burleson

Oracle replication Offline Instantiation

Offline instantiation allows you to create the master group object on the remote sites and then place replication on top of those objects.  While this method can greatly speed up the creation or loading of replication objects, it is not without its own issues.  The base objects must be read-only from the time the data begins moving until replication can assume control.  If the base tables are updated, then the copy will not be in sync. 

Although the mechanics of offline instantiation are simple, the execution is not.  Basically, you create your master group with false “copy_rows”. This tells the master group to use the rows already at the remote site.  No data checks are performed.  If the tables are not in sync, then they will begin replication out of sync and stay that way. 

     gname => '"GROUP1"',
     type => 'TABLE',
     oname => '"BOOK"',
     sname => '"PUBS"',
     copy_rows => FALSE,
     use_existing_object => TRUE);

Now comes the hard part. How do you get the data to the remote site?  The difficulty is that the base tables must remain in read-only state until transfer is

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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