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Re: My quick and dirty "solution" (Re: Performance P roblem with Vacuum of bytea table (PG 8.0.13))

From: "Andreas Kostyrka" <andreas(at)kostyrka(dot)org>
To: Bastian Voigt <post(at)bastian-voigt(dot)de>
Cc: Richard Huxton <dev(at)archonet(dot)com>,pgsql-performance(at)postgresql(dot)org
Subject: Re: My quick and dirty "solution" (Re: Performance P roblem with Vacuum of bytea table (PG 8.0.13))
Date: 2007-05-25 15:20:23
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Lists: pgsql-performance
TOASTed means storage outside of the main table. But AFAIK, only rows bigger 2K are considered for toasting.


-- Ursprüngl. Mitteil. --
Betreff:	Re: My quick and dirty "solution" (Re: [PERFORM] Performance Problem with Vacuum of bytea table (PG 8.0.13))
Von:	Bastian Voigt <post(at)bastian-voigt(dot)de>
Datum:		25.05.2007 14:13

Richard Huxton wrote:
> Could you check the output of vacuum verbose on that table and see how 
> much work it's doing? I'd have thought the actual bytea data would be 
> TOASTed away to a separate table for storage, leaving the vacuum with 
> very little work to do.
I'm quite new to postgres (actually I just ported our running 
application from MySQL...), so I don't know what toast means. But I 
noticed that vacuum also tried to cleanup some "toast" relations or so. 
This was what took so long.

> It might well be your actual problem is your disk I/O is constantly 
> saturated and the vacuum just pushes it over the edge. In which case 
> you'll either need more/better disks or to find a quiet time once a 
> day to vacuum and just do so then.
Yes, that was definitely the case. But now everything runs smoothly 
again, so I don't think I need to buy new disks.


Bastian Voigt
Neumünstersche Straße 4
20251 Hamburg
telefon +49 - 40  - 67957171
mobil   +49 - 179 - 4826359

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