Re: [PERFORM] autovacuum strategy / parameters

2010-04-30 Thread Alvaro Herrera
Josh Berkus escribió: > #autovacuum_vacuum_scale_factor = 0.2 > > This is set because in my experience, 20% bloat is about the level at > which bloat starts affecting performance; thus, we want to vacuum at > that level but not sooner. This does mean that very large tables which > never have mor

Re: [PERFORM] autovacuum strategy / parameters

2010-04-30 Thread Josh Berkus
> My guess is that the reason we run ANALYZE more frequently than vacuum > (with the default settings) is that ANALYZE is pretty cheap. In many > cases, if the statistical distribution of the data hasn't changed > much, then it's not really necessary, but it doesn't cost much either. > And for c