From: Matthew T. O'Connor <matthew@zeut.net>
To: Chris Hoover <revoohc@gmail.com>
Cc: pgsql-admin@postgresql.org Admin <pgsql-admin@postgresql.org>
Subject: Re: More Autovacuum questions
Date: Tue, 15 Jul 2008 11:12:30 -0400
Message-ID: <487CBE5E.6030903@zeut.net> (raw)
In-Reply-To: <1d219a6f0807150619o567709ebu7d28429d2907bf82@mail.gmail.com>
References: <1d219a6f0807150619o567709ebu7d28429d2907bf82@mail.gmail.com>
Chris Hoover wrote:
> Another question.
>
> When autovacuum sleeps, does it release the lock it has on the table?
>
> What we would like to have happen is for vacuum to work for a while,
> sleep, and while it is sleeping run an analyze on the table. We need
> this due to how quickly our data is changing. Currently we are running
> analyze every 5 minutes against the table of question and get a very
> serious performance hit when vacuum runs due to the index stats getting
> out of date. As soon as we rerun analyze after the vacuum happiness
> returns.
>
> The pg_total_relation_size for the table in question is 64GB, and as
> stated above is a very heavily used and modifed table.
As Alvaro already said this is a case where autovacuum still isn't
great. Perhaps what you should do here is disable auto-vacumming of the
table during busy periods and and only have it vacuum at off peak times?
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To: pgsql-admin@postgresql.org
Cc: matthew@zeut.net, revoohc@gmail.com
Subject: Re: More Autovacuum questions
In-Reply-To: <487CBE5E.6030903@zeut.net>
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