Re: stats collector process high CPU utilization

Tom Lane wrote:
> Benjamin Minshall <minshall@intellicon.biz> writes:
>> Seems the problem may be related to a huge global/pgstat.stat file.
>> Under 8.1.5 it was about 1 MB; now it's 90 MB in 8.2.3.
>
> Yoi.  We didn't do anything that would bloat that file if it were
> storing the same information as before.  What I'm betting is that it's
> storing info on a whole lot more tables than before.

The server is running on the same actual production data, schema and
workload as before.

> Did you decide to start running autovacuum when you updated to 8.2?

Autovacuum was on and functioning before the update.

> How many tables are visible in the pg_stats views?

There are about 15 databases in the cluster each with around 90 tables.
  A count of pg_stats yields between 500 and 800 rows in each database.

select count(*) from (select distinct tablename from pg_stats) as i;
  count
-------
     92
(1 row)

select count(*) from pg_stats;
  count
-------
    628
(1 row)

--
Benjamin Minshall <minshall@intellicon.biz>
Senior Developer -- Intellicon, Inc.
http://www.intellicon.biz