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Performance decrease dramaticcaly by using statistics

From: Gijanto, Ruud <RGijanto_at_ctgzorg.nl>
Date: Fri, 22 Feb 2002 08:24:00 +0100
Message-ID: <7C3B10C067C2D2119CE60020354473CE6806C7@SPICA>


We have a Oracle Cliënt-application fully generated by Designer 2.1.2 and a Databaseserver 8.1.7.2 on a IBM RS6000/AIX. The cliënt-application call a user-exit on the RS6000 AIX-machine and written on c (.csql). The embedded sqls in the user-exit use a lot of table joins. A view is not use because the sql-statement will be build dynamically depends on the transactions job and a various parameter variables. OPTIMIZER_MODE = CHOOSE
Without statistics is the elapsed time of a jobs/transactions approximately 1 minute.
With statistics increase the elapsed-time to min. 25 minutes. I don't understand why this happened.
Could someone help me with hints where i have to looking for to analyze this problem.

Thanks,
Ruud Gijanto
rgijanto_at_ctgzorg.nl   Received on Fri Feb 22 2002 - 01:24:00 CST

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