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

From: Tatsuo Ishii <ishii(at)postgresql(dot)org>
To: decibel(at)decibel(dot)org
Cc: alvherre(at)commandprompt(dot)com, ishii(at)postgresql(dot)org,tgl(at)sss(dot)pgh(dot)pa(dot)us, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Re: [COMMITTERS] pgsql: Fix free space map to correctly track the total amount of FSM
Date: 2007-10-04 06:23:49
Message-ID: 20071004.152349.81959457.t-ishii@sraoss.co.jp (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
> 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

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