From: Kiriakos Tsourapas <ktsour@gmail.com>
To: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres becoming slow, only full vacuum fixes it
Date: Tue, 25 Sep 2012 14:07:55 +0300
Message-ID: <BA0641CA-5B57-4534-AB35-00B2A16FEA4B@gmail.com> (raw)
In-Reply-To: <5060E7F2.3010903@catalyst.net.nz>
References: <D15ECA12-8D6E-4E53-A294-5E175564CA61@gmail.com>
<5060E7F2.3010903@catalyst.net.nz>
Hi Mark,
When the problem appears, vacuuming is not helping. I ran vacuum manually and the problem was still there. Only full vacuum worked.
As far as I have understood, autovacuuming is NOT doing FULL vacuum. So, messing around with its values should not help me in any way.
Thanks
>
> Given that vacuum full fixes the issue I suspect you need to have autovacuum set wake up much sooner, not later. So autovacuum_naptime = 28800 or even = 60 (i.e the default) is possibly too long. We have several database here where I change this setting to 10 i.e:
>
> autovacuum_naptime = 10s
>
>
> in order to avoid massive database bloat and queries that get slower and slower...
>
> You might want to be a bit *less* aggressive with autovacuum_vacuum_scale_factor - I usually have this at 0.1, i.e:
>
> autovacuum_vacuum_scale_factor = 0.1
>
>
> otherwise you will be vacuuming all the time - which is usually not what you want (not for all your tables anyway).
>
> regards
>
> Mark
>
>
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To: pgsql-performance@postgresql.org
Cc: ktsour@gmail.com, mark.kirkwood@catalyst.net.nz
Subject: Re: Postgres becoming slow, only full vacuum fixes it
In-Reply-To: <BA0641CA-5B57-4534-AB35-00B2A16FEA4B@gmail.com>
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