From: Mark Kirkwood <markir@paradise.net.nz>
To: Yves Vindevogel <yves.vindevogel@implements.be>
Cc: pgsql-performance@postgresql.org
Subject: Re: Updates on large tables are extremely slow
Date: Mon, 13 Jun 2005 20:54:23 +1200
Message-ID: <42AD49BF.7050706@paradise.net.nz> (raw)
In-Reply-To: <e61732b6bc4e763c947b526c2c099fbc@implements.be>
References: <579bc853ef3957c736c2773f13c444f7@implements.be>
<42ACF2DD.8090409@paradise.net.nz>
<e61732b6bc4e763c947b526c2c099fbc@implements.be>
Apologies - I should have said output of 'VACUUM VERBOSE mytable'.
(been using 8.1, which displays dead tuple info in ANALYZE...).
Mark
Yves Vindevogel wrote:
> rvponp=# analyze verbose tblPrintjobs ;
> INFO: analyzing "public.tblprintjobs"
> INFO: "tblprintjobs": 19076 pages, 3000 rows sampled, 588209 estimated
> total rows
> ANALYZE
>
>
> On 13 Jun 2005, at 04:43, Mark Kirkwood wrote:
>
> Yves Vindevogel wrote:
>
> I'm trying to update a table that has about 600.000 records.
> The update query is very simple : update mytable set pagesdesc =
> - pages ;
> The query takes about half an hour to an hour to execute. I have
> tried a lot of things.
>
>
> Half an hour seem a bit long - I would expect less than 5 minutes on
> reasonable hardware.
>
> You may have dead tuple bloat - can you post the output of 'ANALYZE
> VERBOSE mytable' ?
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To: pgsql-performance@postgresql.org
Cc: markir@paradise.net.nz, yves.vindevogel@implements.be
Subject: Re: Updates on large tables are extremely slow
In-Reply-To: <42AD49BF.7050706@paradise.net.nz>
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