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Message Posted: Tue, 21 Dec 2010 @ 10:54:40 GMT

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Subj:   Re: Explain shows Low confidence even after collect stats
From:   Maccha Narayana Rao Naidu

Low Confidence after collecting stats doesn't state that your query or stats are bad. Low confidence may arise in below condition which are unavoidable in some scenarios

- Restricting conditions exist on index or column that have collected statistics but are AND-ed/OR-ed together with conditions on non-indexed columns.

Hope this helps



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