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  3. October 2005

Re: SQL Optimizer Issue

You may need to just let IBM work through it. I've been down this road with the optimizer a few times. It's got to be everyone's worst nightmare to work on. Last time for me, it took three service sessions in debug on our production box before the problem was actually diagnosed, and then another several weeks before we had a fix. However, when the fix was ready, it did work, and didn't cause any other problems, so we were happy. If you're going to use SQL in a heavy duty way, you occasionally will end up with this kind of stuff. We always install new releases and PTFs on a test box and I try to test all of the fancy queries there first, exactly because of that issue. It's important to test with the full database, because the optimizer takes table size into consideration when it determines its access plans.

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