Re: Memory usage of auto-vacuum

From: Gael Le Mignot
Subject: Re: Memory usage of auto-vacuum
Date: ,
Msg-id: plop87pqljn8zh.fsf@aoskar.kilobug.org
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In response to: Re: Memory usage of auto-vacuum  (Craig Ringer)
List: pgsql-performance

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Memory usage of auto-vacuum  (Gael Le Mignot, )
 Re: Memory usage of auto-vacuum  (Craig Ringer, )
  Re: Memory usage of auto-vacuum  (Gael Le Mignot, )
 Re: Memory usage of auto-vacuum  (Guillaume Lelarge, )
  Re: Memory usage of auto-vacuum  (Gael Le Mignot, )
   Re: Memory usage of auto-vacuum  (Guillaume Lelarge, )
    Re: Memory usage of auto-vacuum  (Gael Le Mignot, )
     Re: Memory usage of auto-vacuum  (Guillaume Lelarge, )
      Re: Memory usage of auto-vacuum  (Gael Le Mignot, )
       Re: Memory usage of auto-vacuum  (Tom Lane, )
        Re: Memory usage of auto-vacuum  (Gael Le Mignot, )
   Re: Memory usage of auto-vacuum  (Craig Ringer, )
 Re: Memory usage of auto-vacuum  (Gael Le Mignot, )

Hello Craig!

Sat, 09 Jul 2011 16:31:47 +0800, you wrote:

 > On 9/07/2011 3:25 PM, Gael Le Mignot wrote:
 >>
 >> Hello,
 >>
 >> We are running  a PostgreSQL 8.4 database, with  two tables containing a
 >> lot (>  1 million) moderatly  small rows. It contains some btree indexes,
 >> and one of the two tables contains a gin full-text index.
 >>
 >> We noticed  that the  autovacuum process  tend to use  a lot  of memory,
 >> bumping the postgres process near 1Gb while it's running.

 > What is maintenance_work_mem set to in postgresql.conf?

It's the debian default, which is 16Mb. Do you think we should reduce it ?

I also forgot to add something which may be important : there are a lot
of INSERT (and SELECT) in those tables, but very few UPDATE/DELETE.

Regards,

--
Gaël Le Mignot - 
Pilot Systems - 9, rue Desargues - 75011 Paris
Tel : +33 1 44 53 05 55 - www.pilotsystems.net
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