From: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: Carlo Stonebanks <stonec.register@sympatico.ca>
Cc: Ow Mun Heng <Ow.Mun.Heng@wdc.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: REPOST: Nested loops row estimates always too high
Date: Tue, 25 Sep 2007 11:31:33 +0200
Message-ID: <20070925093133.GA27052@uio.no> (raw)
In-Reply-To: <53877A06E07146D2898619A7025C6107@serenity>
References: <fcu215$2em3$1@news.hub.org>
<1190616376.17050.51.camel@neuromancer.home.net>
<fd8ukj$s38$1@news.hub.org>
<1190681440.22945.8.camel@neuromancer.home.net>
<53877A06E07146D2898619A7025C6107@serenity>
On Tue, Sep 25, 2007 at 12:53:55AM -0400, Carlo Stonebanks wrote:
> My problem is that I think that SRF's are causing my problems. The SRF's
> gets an automatic row estimate of 1000 rows. Add a condition to it, the
> planner guesses 333 rows. Even at 333, this is an overestimate of the number
> of rows returned.
>
> I'm really disappointed - SRF's are a great way to place the enterprise's
> db-centric business logic at the server.
Fortunately, in 8.3 you can attach a row estimate to the function yourself,
which should most likely fix your problem. Look forward to the first beta :-)
/* Steinar */
--
Homepage: http://www.sesse.net/
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To: pgsql-performance@postgresql.org
Cc: sgunderson@bigfoot.com, stonec.register@sympatico.ca, Ow.Mun.Heng@wdc.com
Subject: Re: REPOST: Nested loops row estimates always too high
In-Reply-To: <20070925093133.GA27052@uio.no>
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