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  Oracle Replication Tips by Burleson

Oracle Assigning Blocks of Numbers Via Sequences

value for a sequence equal to 1.0E28, you have a very large pool to divide between the master sites. 

There are two key points to remember. First, set up an automated check of the sequences to warn you if any site begins to approach maxvalue. Second, don’t forget the future possibility of adding additional master sites.  If you divide the available number equally between all master sites, adding one master site cuts the available number for one site in half to make room for the new site. This issue alone makes this method of generating unique keys less scalable.

Remember to check dbms_reputil.from_remote=FALSE inside the trigger to insure that the trigger does not fire on a transaction from a remote site.

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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