Re: autovacuum stress-testing our system

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