Re: slow query

Robert,

> Actually if you are vacuuming frequently enough, it can (and should*)
> obviate a vacuum full. Be aware that frequently enough might mean really
> frequent, for instance I have several tables in my database that update
> every row within a 15 minute timeframe, so I run a "lazy" vacuum on
> these tables every 10 minutes. This allows postgresql to reuse the space
> for these tables almost continuously so I never have to vacuum full
> them.

This would assume absolutely perfect FSM settings, and that the DB never gets 
thrown off by unexpected loads.  I have never been so fortunate as to work 
with such a database.   However, I agree that good FSM tuning and frequent 
regular VACUUMs can greatly extend the period required for running FULL.

I have not found, though, that this does anything to prevent the need for 
REINDEX on frequently-updated tables.  How about you, Robert?

-- 
Josh Berkus
Aglio Database Solutions
San Francisco