Oracle Sequences issues during replication, data merge,..etc

When we are using Sequences there is a possibility of getting duplicate numbers during data replication and data merge. The best bet is GUIDs.

http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/functions125a.htm#79196
http://www.opengroup.org/onlinepubs/9629399/apdxa.htm
http://feuerthoughts.blogspot.com/2006/02/watch-out-for-sequential-oracle-guids.html

Universal Unique Identifier (UUID)
http://www.oracle-base.com/articles/9i/UUID9i.php
-o-

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