Re: stats collector suddenly causing lots of IO - Mailing list pgsql-performance

From Tom Lane
Subject Re: stats collector suddenly causing lots of IO
Date
Msg-id 10082.1271432484@sss.pgh.pa.us
Whole thread Raw
In response to Re: stats collector suddenly causing lots of IO  (Josh Kupershmidt)
Responses Re: stats collector suddenly causing lots of IO  (Josh Kupershmidt)
List pgsql-performance
Josh Kupershmidt <> writes:
> On Fri, Apr 16, 2010 at 11:23 AM, Tom Lane <> wrote:
>> Hmm. �That makes me wonder if autovacuum is functioning properly at all.
>> What does pg_stat_all_tables show for the last vacuum and analyze times
>> of those tables? �Try something like
>>
>> select relname,n_live_tup,n_dead_tup,last_vacuum,last_autovacuum,last_analyze,last_autoanalyze from
pg_stat_all_tableswhere schemaname = 'pg_catalog' order by 1; 

> Output attached. Note that I ran pg_stat_reset() a few days ago.

Wow.  Well, we have a smoking gun here: for some reason, autovacuum
isn't running, or isn't doing its job if it is.  If it's not running
at all, that would explain failure to prune the stats collector's file
too.

Is there anything in the postmaster log that would suggest autovac
difficulties?

            regards, tom lane

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