Re: Memory usage of auto-vacuum

Hello Guillaume!

Sat, 09 Jul 2011 11:06:16 +0200, you wrote:

> On Sat, 2011-07-09 at 11:00 +0200, Gael Le Mignot wrote:
>> Hello Guillaume!
>>
>> Sat, 09 Jul 2011 10:53:14 +0200, you wrote:
>>
>> > I don't quite understand how you can get up to 1GB used by your process.
>> > According to your configuration, and unless I'm wrong, it shouldn't take
>> > more than 40MB. Perhaps a bit more, but not 1GB. So, how did you find
>> > this number?
>>
>> Looking at "top" we saw the postgres process growing and growing and
>> then shrinking back, and doing a "select * from pg_stat_activity;" in
>> parallel of the growing we found only the "vacuum analyze" query running.
>>

> There is not only one postgres process. So you first need to be sure
> that it's the one that executes the autovacuum.

Shouldn't "pg_stat_activity" contain the current jobs of all the processes ?

>> But maybe we drawn the conclusion too quickly, I'll try disabling the
>> auto vacuum to see if we really get rid of the problem doing it.
>>

> Disabling the autovacuum is usually a bad idea. You'll have to execute
> VACUUM/ANALYZE via cron, which could get hard to configure.

Oh, yes, sure, I meant as a test to know if it's the vacuum or not, not
to definitely disable it.

> BTW, what's your PostgreSQL release? I assume at least 8.3 since you're
> using FTS?

It's 8.4 from Debian Squeeze.

--
Gaël Le Mignot - gael(at)pilotsystems(dot)net
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