RE: query slow in 9i, but not slow in 8i

From: Wolfgang Breitling <breitliw_at_centrexcc.com>
Date: Mon, 01 Mar 2004 11:05:33 -0700
Message-Id: <6.0.3.0.2.20040301110245.02b67580@pop.centrexcc.com>

Piggy-backing on Mark's observation of significantly different cardinality estimates, can you check specifically for the presence of histograms on the columns

identifier.seqtabid, identifier.type, and identifier.speciesid

in Oracle 9i

At 10:28 AM 3/1/2004, you wrote:
>It would appear from the statistics that there may be a significant
>difference in the row counts (cardinality) for the tables involved between
>the two instances. If this is true then this is not a fair comparison. To
>compare differences in two version of the database the same data really
>should be used to generate the statistics and plans.

Wolfgang Breitling
Oracle7, 8, 8i, 9i OCP DBA
Centrex Consulting Corporation
http://www.centrexcc.com

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Received on Mon Mar 01 2004 - 12:05:21 CST