From: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: pgsql-performance@postgresql.org
Subject: Re: zero performance on query
Date: Wed, 26 Oct 2005 12:30:51 +0200
Message-ID: <20051026103051.GB1742@uio.no> (raw)
In-Reply-To: <BAY23-F12AC56187BE1C2D1BAA64DCE690@phx.gbl>
References: <BAY23-F12AC56187BE1C2D1BAA64DCE690@phx.gbl>
On Tue, Oct 25, 2005 at 10:26:43PM -0600, Sidar López Cruz wrote:
> look at this:
> select count(*) from fotos where archivo not in (select archivo from
> archivos)
> Aggregate (cost=4899037992.36..4899037992.37 rows=1 width=0)
> -> Seq Scan on fotos (cost=22598.78..4899037338.07 rows=261716 width=0)
> Filter: (NOT (subplan))
> SubPlan
> -> Materialize (cost=22598.78..39304.22 rows=805344 width=58)
> -> Seq Scan on archivos (cost=0.00..13141.44 rows=805344
> width=58)
Now, this is interesting; it seems to trigger exactly the same oddity as my
query did (at least one of them; the materialized sequential scan).
/* Steinar */
--
Homepage: http://www.sesse.net/
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To: pgsql-performance@postgresql.org
Cc: sgunderson@bigfoot.com
Subject: Re: zero performance on query
In-Reply-To: <20051026103051.GB1742@uio.no>
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