From: Andres Freund <andres@anarazel.de>
To: Cédric Villemain <cedric.villemain.debian@gmail.com>
Cc: pgsql-performance@postgresql.org, Michael Kohl <michael.kohl@tupalo.com>
Subject: Re: High load,
Date: Thu, 27 Jan 2011 14:26:38 +0100
Message-ID: <201101271426.38876.andres@anarazel.de> (raw)
In-Reply-To: <AANLkTi=ZoDQzy=M4JHfsPsU7sDYKHcVb8rvUTh3LiQXE@mail.gmail.com>
References: <AANLkTikBFzUKmWcVBz_5GQZeQOWtj7Kfeov=M9TWBOJf@mail.gmail.com>
<201101271335.24645.andres@anarazel.de>
<AANLkTi=ZoDQzy=M4JHfsPsU7sDYKHcVb8rvUTh3LiQXE@mail.gmail.com>
On Thursday, January 27, 2011 02:23:48 PM Cédric Villemain wrote:
> 2011/1/27 Andres Freund <andres@anarazel.de>:
> > On Thursday, January 27, 2011 12:24:10 PM Cédric Villemain wrote:
> >> > maintenance_work_mem = 512MB
> >>
> >> 128MB is usualy enough
> >
> > Uhm, I don't want to be picky, but thats not really my experience. Sorts
> > for index creation are highly dependent on a high m_w_m. Quite regularly
> > I find the existing 1GB limit a probleme here...
>
> That is right for index creation, but not for 'pure' maintenance
> stuff. Once the database is running as usual, there is no really point
> to give auto-vacuum or auto-analyze much more (depend on the raid card
> memory too ...)
Even that I cannot agree with, sorry ;-). If you have a database with much
churn a high m_w_m helps to avoid multiple scans during vacuum of the database
because the amount of dead tuples doesn't fit m_w_m.
Andres
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To: pgsql-performance@postgresql.org
Cc: andres@anarazel.de, cedric.villemain.debian@gmail.com, michael.kohl@tupalo.com
Subject: Re: High load,
In-Reply-To: <201101271426.38876.andres@anarazel.de>
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