I'm not even trying to be more than just moderately funny about this, but yes, you should worry about stats going wroing and yes it happens. But not very often. The way forward is to monitor the execution plans of your important SQL's, I think. Well, it's one of many ways forward. Peter Gram built a free and very simple tool for use against 7.3.4 recently, which will send the DBA and/or Development chief an email when an execution plan changes. It might be for the better, it might be for the worse. But it changed. Then you can investigate why the plan changed, and here there could be many, many reasons.
Mogens
Mogens
Craig Healey wrote:
Thanks for all the suggestions. After playing about, it was apparent that the stats were wrong for the table and screwing up the CBO. I had done analyze ... calculate, but they were still wrong. I dropped the stats, estimated at 5% and things are now back to normal. I had thought that analyze ... calculate would clear out the old stats, but it doesn't seem to have done. BTW, should I be worried about the stats going wrong, or does this normally occur every so often?
Craig Healey
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