From: Michael Fuhr <mike@fuhr.org>
To: Carlos Benkendorf <carlosbenkendorf@yahoo.com.br>
Cc: pgsql-performance@postgresql.org
Subject: Re: How much expensive are row level statistics?
Date: Sun, 11 Dec 2005 12:44:43 -0700
Message-ID: <20051211194442.GA97174@winnie.fuhr.org> (raw)
In-Reply-To: <20051211115336.91041.qmail@web35506.mail.mud.yahoo.com>
References: <20051211115336.91041.qmail@web35506.mail.mud.yahoo.com>
On Sun, Dec 11, 2005 at 11:53:36AM +0000, Carlos Benkendorf wrote:
> I would like to use autovacuum but is not too much expensive
> collecting row level statistics?
The cost depends on your usage patterns. I did tests with one of
my applications and saw no significant performance difference for
simple selects, but a series of insert/update/delete operations ran
about 30% slower when block- and row-level statistics were enabled
versus when the statistics collector was disabled.
--
Michael Fuhr
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To: pgsql-performance@postgresql.org
Cc: mike@fuhr.org, carlosbenkendorf@yahoo.com.br
Subject: Re: How much expensive are row level statistics?
In-Reply-To: <20051211194442.GA97174@winnie.fuhr.org>
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