At 06:29 AM 7/31/2003 -0800, you wrote:
Thanks to Wolfgang for spotting the problem. It was not the inlist iterator at all but an outer join! The NOT NULL predicate invalidated the outer join, so the optimizer was smart enough to make a different decision. I am still perplexed as to why the table access information was so radically different, but in light of the new finding, an explanation can be found.
The lesson learned here is to not to focus on a 'problem' until you fully understand the whole situation.
Daniel
Wolfgang Breitling Oracle7, 8, 8i, 9i OCP DBA Centrex Consulting Corporation http://www.centrexcc.com
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