Re: Re: [COMMITTERS] pgsql: Fix free space map to correctly track the total amount of FSM

> On Tue, Oct 02, 2007 at 09:07:54PM -0400, Alvaro Herrera wrote:
> > Decibel! wrote:
> > 
> > > Hrm... what about adding output to vacuum verbose that indicates how many 
> > > pages in a relation have free space? That would allow something like 
> > > pgfouine to see how many FSM pages were needed. It would also make it 
> > > easier to identify relations that could stand a vacuum full/reindex/cluster 
> > > (though you'd also want to know something like average free space per 
> > > page).
> > 
> > Rather than wasting time fixing minor FSM issues, I would favor
> > rewriting the stuff so that the FSM is disk-spillable.
> 
> Sure, but this would also likely be a 20 line change to vacuum...

These proposals would not help, at least me at all. Since I was
talking about the pre 8.2 versions. There's 0 chance these changes are
backported to previous versions. I'm thinkg about writing a small
function which will do something 8.2 or later's vacuum does(telling
the right FSM pages needed).
--
Tatsuo Ishii
SRA OSS, Inc. Japan