From: | Tomas Vondra <tv(at)fuzzy(dot)cz> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: autovacuum stress-testing our system |
Date: | 2012-09-26 15:35:02 |
Message-ID: | 66087d1adc6b71732628a025e970de7c@fuzzy.cz |
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Dne 26.09.2012 17:29, Alvaro Herrera napsal:
> Excerpts from Tomas Vondra's message of mié sep 26 12:25:58 -0300
> 2012:
>> Dne 26.09.2012 16:51, Jeff Janes napsal:
>
>> > I think forking it off to to another value would be better. If
>> you
>> > are an autovacuum worker which is just starting up and so getting
>> its
>> > initial stats, you can tolerate a stats file up to
>> > "autovacuum_naptime
>> > / 5.0" stale. If you are already started up and are just about to
>> > vacuum a table, then keep the staleness at PGSTAT_RETRY_DELAY as
>> it
>> > currently is, so as not to redundantly vacuum a table.
>>
>> I always thought there's a "no more than one worker per database"
>> limit,
>
> There is no such limitation.
OK, thanks. Still, reading/writing the small (per-database) files would
be
much faster so it would be easy to read/write them more often on
demand.
Tomas
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