From: Tom Lane <tgl@sss.pgh.pa.us>
To: Tim Jones <TJones@optio.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: strange query behavior
Date: Wed, 13 Dec 2006 14:16:32 -0500
Message-ID: <10648.1166037392@sss.pgh.pa.us> (raw)
In-Reply-To: <47668A1334CDBF46927C1A0DFEB223D39F79A5@mail.optiosoftware.com>
References: <47668A1334CDBF46927C1A0DFEB223D39F79A5@mail.optiosoftware.com>
"Tim Jones" <TJones@optio.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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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, TJones@optio.com
Subject: Re: strange query behavior
In-Reply-To: <10648.1166037392@sss.pgh.pa.us>
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