This is why I always set the parameters generic in test and force them to
reprove their need, before including them in the upgrade.
Mike
From: Juan Carlos Reyes Pacheco <juancarlosreyesp@xxxxxxxxx> Reply-To: juancarlosreyesp@xxxxxxxxx To: oracle-l@xxxxxxxxxxxxx, jonathan@xxxxxxxxxxxxxxxxxx Subject: The responsible Date: Tue, 7 Feb 2006 12:46:54 -0400
HI I want to share this info, not asking.
Some years ago I changed the optimizer parameters, and this solved a query, from minutes to seconds OPTIMIZER_INDEX_COST_ADJ = 10 OPTIMIZER_INDEX_CACHING = 90 Now the situation reversed, and I had to comment them To move a process from 4 minutes to 7 seconds.
using optimizer parameters 10,90 trace file 870 M time 4 minutes (without trace) recursive 465.43 s non recursive 233.21 s
commenting optimizer parameters and leaving with their defaults Trace file 6 M time 7 seconds recursive 5.87 s non recursive 1.79 s
-- Oracle Certified Profesional 9i 10g Orace Certified Professional Developer 6i
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