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From: Steve Crawford <scrawford@pinpointresearch.com>
To: Madison Kelly <linux@alteeve.com>
Cc: Rosser Schwarz <rosser.schwarz@gmail.com>
Cc: Brad Nicholson <bnichols@ca.afilias.info>
Cc: Gary Doades <gpd@gpdnet.co.uk>
Cc: pgsql-performance@postgresql.org
Subject: Re: DB is slow until DB is reloaded
Date: Mon, 04 Jan 2010 17:10:47 -0800
Message-ID: <4B429197.7010801@pinpointresearch.com> (raw)
In-Reply-To: <4B428917.3020305@alteeve.com>
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	<4B425222.7070905@gpdnet.co.uk>
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	<4B428917.3020305@alteeve.com>

Madison Kelly wrote:
>
> You are right, autovacuum is not running after all. From your comment, 
> I am wondering if you'd recommend I turn it on or not?...
>
>
I see you are considering an upgrade but FWIW on your 8.1 instance, my 
remaining 8.1 server has been running for years with it on. Read up on 
it at:
http://www.postgresql.org/docs/8.1/static/maintenance.html#AUTOVACUUM

Basically you need to turn on some stats stuff so autovacuum can 
determine when to run (in postgresql.conf):
stats_start_collector = on
stats_row_level = on

And you need to enable autovacuum (in postgresql.conf):
autovacuum = on
autovacuum_naptime = 300                # time between autovacuum runs, 
in secs

Then you can tune it if you need to but at least it will be looking for 
things that are vacuumworthy every 5 minutes.

Cheers,
Steve

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