RE: RULE hint better sometimes after 10.2.0.3 upgrade
Date: Tue, 8 Apr 2008 15:11:46 -0700
I'm not aware of any specific CBO issues between 10.1 and 10.2, but you might want to have a look at this list of common issues for 8i-to-10g upgrades since possibly some of the changes mentioned didn't occur until 10.2: http://www.freelists.org/archives/oracle-l/07-2006/msg00516.html
Beyond that, I'd recommend to BAAG
(http://www.battleagainstanyguess.com/baag/) and I think the best way to do that is look at 10046, and possibly 10053, traces of your problem queries running on 10.1.0.5 and 10.2.0.3 and identify the key differences.
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