RE: Better cardinality estimate when dialing optimizer_features_enable back

  • From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
  • To: Neil Kodner <nkodner@xxxxxxxxx>, oracle-l-freelists <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 24 Nov 2009 10:16:17 -0700

I just reviewed your initial post and I see from that it looks like you were 
already aware of what I stated below, so moving on - are you saying that it's 
coming up with different cardinality estimates for the exact same predicate, or 
just different estimates based on what literal value you plug in for prty_id=x?

From: Allen, Brandon

I pieced it together with a combination of stats from your 10053 and 10046 
traces - so looks like ("LETTER_BIN"."PRTY_ID"=102985) is the part where it's 
estimating incorrectly - might want to focus on your distribution and histogram 
for that column.

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