From: Ondřej Světlík <osvetlik@flexibee.eu>
To: pgsql-admin@postgresql.org
Subject: Re: Autovacuum of pg_shdepend
Date: Wed, 4 May 2016 21:09:07 +0200
Message-ID: <572A48D3.9040906@flexibee.eu> (raw)
In-Reply-To: <20160504152518.GA102195@alvherre.pgsql>
References: <20160504152518.GA102195@alvherre.pgsql>
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Dne 4.5.2016 v 17:25 Alvaro Herrera napsal(a):
> Ondřej Světlík wrote:
>> Hello,
>>
>> we have a strange problem with autovacuum. We have three workers, but
>> usually only one works and two are waiting as they are all trying to process
>> table pg_shdepend which is shared between all databases.
>
> Ooh, interesting bug.
>
> As a workaround I suggest connecting to all of your databases except one
> and disabling autovacuum for pg_shdepend. Then the table will be
> processed in the one database where you left it enabled, and the other
> workers will take care of the rest of the tables.
>
> I'll think about a real fix.
>
Thank you, Alvaro,
we have already tried this, but we are not permitted to alter system
tables. Changing allow_system_table_mods doesn't seem safe enough, is
there another way to achieve this?
Oh, I forgot to mention this is 9.4.7.
Thanks,
Ondřej
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To: pgsql-admin@postgresql.org
Cc: osvetlik@flexibee.eu
Subject: Re: Autovacuum of pg_shdepend
In-Reply-To: <572A48D3.9040906@flexibee.eu>
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