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Re: strange query behavior

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Tim Jones" <TJones(at)optio(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: strange query behavior
Date: 2006-12-13 19:16:32
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
"Tim Jones" <TJones(at)optio(dot)com> writes:
>   I have a query that uses an IN clause and it seems in perform great
> when there is more than two values in it but if there is only one it is
> really slow. Also if I change the query to use an = instead of IN in the
> case of only one value it is still slow.

Please provide EXPLAIN ANALYZE output for both cases.

> Possibly I need to reindex this
> particular index?

More likely you need to ANALYZE the table so that the planner has
up-to-date stats ...

			regards, tom lane

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