Date: Thu, 5 May 2016 12:43:41 -0300
From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: =?utf-8?B?T25kxZllaiBTdsSbdGzDrWs=?= <osvetlik@flexibee.eu>
Cc: pgsql-admin@postgresql.org
Subject: Re: Autovacuum of pg_database
Message-ID: <20160505154341.GA177987@alvherre.pgsql>
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Ondřej Světlík wrote:
> Dne 5.5.2016 v 17:19 Ondřej Světlík napsal(a):
> >Dne 5.5.2016 v 17:16 Ondřej Světlík napsal(a):
> >>Hello again,
> >>
> >>we have another strange problem with autovacuum. The process goes well
> >>until it reaches the table pg_database (in some databases, not all),
> >>then it loops over it forever  (until I run vacuum full analyze on that
> >>table, simple vacuum doesn't help):
> >>
> >>2016-05-05 17:13:33 CEST  34818LOG:  automatic vacuum of table
> >>"somedatabase.pg_catalog.pg_database": index scans: 0
> >>     pages: 0 removed, 233 remain
> >>     tuples: 0 removed, 5817 remain, 0 are dead but not yet removable
> >>     buffer usage: 87 hits, 0 misses, 0 dirtied
> 
> And now the same goes for pg_authid. Sorry for spamming, I hope this is the
> last one.

These are all shared catalogs.  There are others, so you may still see
more.  We got another report for pg_database
https://www.postgresql.org/message-id/A9D40BB7-CFD6-46AF-A0A1-249F04878A2A%40amazon.com
so I suppose there really is a bug.  I don't know what's going on there.

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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