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1. Hi can anyone explain me how to syncronize two database using jsp?    forums.oracle.com

Databases don't support the synchronize/locking approach. Instead they have transactions. I don't believe you can easily distribute a transaction across two databases. If you have operations such as this it suggests you really should have the interlocked tables in the same database. If this is not possible, you may have implement your own rollback when the second update fails.