Re: VACUUM vs auto-vacuum daemon

Sabin Coanda wrote:
> Hi there,
>
> Using explicitly VACUUM command give me the opportunity to fine tune my
> VACUUM scheduling parameters, after I analyze the log generated by VACUUM
> VERBOSE.
>
> On the other hand I'd like to use the auto-vacuum mechanism because of its
> facilities. Unfortunately, after I made some initial estimations for
> autovacuum_naptime, and I set the specific data into pg_autovacuum table, I
> have not a feedback from the auto-vacuum mechanism to check that it works
> well or not. It would be nice to have some kind of log similar with the one
> generated by VACUUM VERBOSE. Is the auto-vacuum mechanism able to provide
> such a useful log ?

No, sorry, autovacuum is not currently very good regarding reporting its
activities. It's a lot better in 8.3 but even there it doesn't report
the full VACUUM VERBOSE log. It looks like this:

LOG: automatic vacuum of table "alvherre.public.foo": index scans: 0
pages: 45 removed, 0 remain
tuples: 10000 removed, 0 remain
system usage: CPU 0.00s/0.00u sec elapsed 0.01 sec
LOG: automatic analyze of table "alvherre.public.foo" system usage: CPU 0.00s/0.00u sec elapsed 0.00 sec

--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.