Re: DB Upgrade complete

[Mike Bonnet <mikeb redhat com>]

On Wed, 2007-07-11 at 18:09 -0400, Toshio Kuratomi wrote:
> On Tue, 2007-07-10 at 10:09 -0500, Mike McGrath wrote:
> > Mike Bonnet wrote:
> > > On Tue, 2007-07-10 at 09:56 -0500, Mike McGrath wrote:
> > >   
> > >> With autovacuum on do we still have to run the nightly vacuum jobs?
> > >>     
> > >
> > > We'll have to keep an eye on the heavily-updated tables, but autovacuum
> > > combined with the max_fsm_pages increase should remove the need for the
> > > nightly vacuums.
> > >   
> > 
> > Sounds good, I'll leave them in the cron.d file but comment them out and 
> > mention why.
> > 
> We probably want to change to a monthly maintenance schedule where we
> run a vacuum full on the dbs.

If things are configured correctly, postgres 8.1 should never require a
full vacuum.  Dead tuples get garbage-collected by the auto-vacuum
process and the space is reused for new tuples.  I'd rather avoid a
window where all access to tables is locked out by the vacuum full.

> I also noticed that shmmax hasn't been increased from the default
> (32MB).  Do we need to do that to match the shared cache buffer (512MB)?
> 
> $ /sbin/sysctl  kernel.shmmax
> kernel.shmmax = 33554432

Yes, there's a note about that in the diff.  It needs to get changed or
postgresql won't start with the modified config.