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Message Posted: Tue, 19 Feb 2008 @ 15:08:23 GMT


     
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Subj:   High confidence in Explain
 
From:   martin.fuchs

Hello,

I am currently analyzing some badly running SQL statements and found something strange (al least for me).

The first statement of the EXPLAIN claimed that 271 rows would be retrieved "with high confidence". Actually 364 rows were retrieved.

Until now, I thought that (with actual statistics) the words "with high confidence" mean "almost exactly". But her we have a 25% difference.

Can anyone explain to me what "high confidence" really means ?


Mit freundlichen Grüßen / With best regards

Martin Fuchs



     
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