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Looking at DB2 log when a SQLCODE -803 duplicate key condition occurs in an INSERT often leads to a rollback of the change already made to the tablespace and/or in the non unique indexes defined against the affected table. Would it be possible to check for the duplicate key condition before updating the data and index pages? this would lead in a more efficient revert of the data changes made and less read/write IO activity in log. In addition it could alleviate some object unavailability issues.
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