Re: Stray autovacuum daemon - Mailing list pgsql-admin

From Mikko Partio
Subject Re: Stray autovacuum daemon
Date
Msg-id 2ca799770802220901r3b4bbe4cnd64b86878336372e@mail.gmail.com
Whole thread Raw
In response to Re: Stray autovacuum daemon  (Alvaro Herrera <alvherre@commandprompt.com>)
Responses Re: Stray autovacuum daemon
List pgsql-admin


On Fri, Feb 22, 2008 at 5:44 PM, Alvaro Herrera <alvherre@commandprompt.com> wrote:
Mikko Partio escribió:

> Now, the problem is that I cannot turn autovacuum off! I have tried to set
> autovacuum = off at postgresql.conf with no avail. I have also tried to
> disable the vacuum by inserting rows to pg_autovacuum but still the vacuum
> processes just pop up. What's even more weird is that autovacuum is
> vacuuming the same tables over and over. No sign of xid wraparound issues
> show in the logs. How can I stop autovacuum without restarting the database
> instance?

If your database is in danger of Xid wraparound, autovacuum will run on
it no matter what you do.  Check pg_class.relfrozenxid and
pg_database.datfrozenxid, and the current Xid counter (from
pg_controldata I think).  Also take a look at the description of the
autovacuum_min_freeze_age param (or was it max_freeze_age?  I forget).


But I thought vacuum would send some messages to log if xid wraparound is looming?

SELECT relname, age(relfrozenxid) FROM pg_class WHERE relkind = 'r' order by 2 desc limit 4;
    relname    |    age
---------------+-----------
 table1 | 2141707556
 table2 | 2141707556
 table3  | 2141707556
 table4  | 2141707556


SELECT datname, age(datfrozenxid) FROM pg_database;
  datname  |    age
-----------+------------
 template1 | 1833384067
 template0 | 1833384065
 postgres  | 1933384063
 mydb     | 2040873036

Seems ok to me ... ? autovacuum_freeze_max_age and vacuum_freeze_min_age have the default value.

Regards

Mikko

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