Re: Autovacuum on by default?

Alvaro Herrera wrote:
> Matthew T. O'Connor wrote:
> > Bruce Momjian wrote:
> > >Matthew T. O'Connor wrote:
> > >  
> > >>Any chance we can make this change before release?  I think it's very 
> > >>important to be able to look through the logs and *know* that you tables 
> > >>are getting vacuumed or not.
> > >>    
> > >
> > >Agreed.  I just IM'ed Alvaro and he says pg_stat_activity should now
> > >show exactly what autovacuum is doing (and if it doesn't, let's fix it).
> > >I think that is the best solution to the monitoring problem, rather than
> > >throwing lines in the server logs.
> > 
> > I'm not sure I agree with this.  I can use the pg_stat_activity table to 
> > see if autovacuum is doing something right now, but what I want to be 
> > able to do is look through my logs and see that table_foo hasn't been 
> > vacuumed since last week, or that table_bar has been vacuumed 7 times 
> > today.  Can I do that just with the stat system alone?
> 
> Actually Larry just reminded us that you can use pg_stat_all_tables to
> see that information.  However I'm testing it and it doesn't seem to
> work for all tables ... strange.  I'll have a look.

Nevermind -- it's just that if you vacuum a table which you haven't
touched (insert, update, delete) since the last stats reset, then the
vacuum info isn't recorded because we refuse to create the pgstat entry
for the table.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support