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Message Posted: Tue, 22 Nov 2011 @ 22:29:32 GMT

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<-- Anonymously Posted: Tuesday, November 22, 2011 16:57 -->

That would happen if query that you are running would have a table(s) that are being updated , or inserted into several times a day.

Check the row #'s during these times and also the last time the stats were refreshed. And as also pointed out - look for changes in explain

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