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From: Ivan Voras <ivoras@freebsd.org>
To: pgsql-performance@postgresql.org
Subject: Re: Air-traffic benchmark
Date: Thu, 07 Jan 2010 15:51:26 +0100
Message-ID: <hi4sde$k7p$1@ger.gmane.org> (raw)
In-Reply-To: <852badbc1001070623m5d901c42k50bb808409141ca4@mail.gmail.com>
References: <852badbc1001070438j36eb10d3qa22398ffcbef405f@mail.gmail.com>
	<4B45E36E.4040706@tweakers.net>
	<852badbc1001070547p48b47175vf87efc473e3bd41b@mail.gmail.com>
	<26014999.20100107150535@erwied.eu>
	<852badbc1001070610p698dc3cfr4628b1e7768990e6@mail.gmail.com>
	<20100107141423.GC4315@alvh.no-ip.org>
	<852badbc1001070623m5d901c42k50bb808409141ca4@mail.gmail.com>

On 7.1.2010 15:23, Lefteris wrote:

> I think what you all said was very helpful and clear! The only part
> that I still disagree/don't understand is the shared_buffer option:))

Did you ever try increasing shared_buffers to what was suggested (around
4 GB) and see what happens (I didn't see it in your posts)?

Shared_buffers can be thought as the PostgreSQLs internal cache. If the
pages being scanned for a particular query are in the cache, this will
help performance very much on multiple exequtions of the same query.
OTOH, since the file system's cache didn't help you significantly, there
is low possibility shared_buffers will. It is still worth trying.



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