From: Mark Lewis <mark.lewis@mir3.com>
To: Jean-Philippe Côté <jean-philippe.cote@crt.umontreal.ca>
Cc: pgsql-performance@postgresql.org
Subject: Re: Extremely irregular query performance
Date: Wed, 11 Jan 2006 15:50:43 -0800
Message-ID: <1137023443.30926.2.camel@archimedes> (raw)
In-Reply-To: <20060111234149.05DEA384099@crt0.crt.umontreal.ca>
References: <20060111234149.05DEA384099@crt0.crt.umontreal.ca>
If this is a query that will be executed more than once, you can also
avoid incurring the planning overhead multiple times by using PREPARE.
-- Mark Lewis
On Wed, 2006-01-11 at 18:50 -0500, Jean-Philippe Côté wrote:
> Thanks a lot for this info, I was indeed exceeding the genetic
> optimizer's threshold. Now that it is turned off, I get
> a very stable response time of 435ms (more or less 5ms) for
> the same query. It is about three times slower than the best
> I got with the genetic optimizer on, but the overall average
> is much lower.
>
> I'll also try to play with the geqo parameters and see if things
> improve.
>
> Thanks again,
>
> J-P
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To: pgsql-performance@postgresql.org
Cc: mark.lewis@mir3.com, jean-philippe.cote@crt.umontreal.ca
Subject: Re: Extremely irregular query performance
In-Reply-To: <1137023443.30926.2.camel@archimedes>
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