On Tue, 2007-02-13 at 21:44 -0500, Tom Lane wrote:
> Rajarshi Guha <rguha@indiana.edu> writes:
> > However the clause:
> > dock.target = '1YC1' and
> > dock.dockid = dockscore_plp.id
> > reduces the number of rows from 4.6M to 96K.
>
> The planner seems to be estimating about ten times that many. Perhaps
> increasing the statistics target for dock.target would help?
My original message had a typo: I expected that it should ~ 960K, so
postgres is working as expected.
However increasing the statistics target for dock.target did lead to an
improvement in performance. Could this be because dock.target has only 5
unique values? So though the table has ~4.6M rows, each set of ~960K
rows for dock.dockid is associated with a single value of dock.target.
Thanks,
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Rajarshi Guha <rguha@indiana.edu>
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