Subject: Re: Autovacuum of pg_database
References: <20160505155126.GA180309@alvherre.pgsql>
To: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
From: =?UTF-8?B?T25kxZllaiBTdsSbdGzDrWs=?= <osvetlik@flexibee.eu>
Message-ID: <572B6CE1.1010208@flexibee.eu>
Date: Thu, 5 May 2016 17:55:13 +0200
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Dne 5.5.2016 v 17:51 Alvaro Herrera napsal(a):
> Vicky Soni  - Quipment India wrote:
>> Hello,
>>
>>                     I have observed that after upgrading from 9.3 to 9.4 on windows, autovacuum keep running again and again.
>>
>> In 9.3 this was not true. Any recommendations?
>
> Maybe there is a multixact wraparound problem.  What 9.3 were you
> running previously, and what 9.4 did you upgrade to?  Can you share the
> output of pg_controldata?  Please paste the output of this query
>    select datname, datminmxid from pg_database
>

That sound's reasonable, our autovacuum problems started with processes 
labeled as 'to prevent wraparound' (on pg_shdepend). We use 9.4.

Ondřej


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