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

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Decibel! <decibel(at)decibel(dot)org>
Cc: Tatsuo Ishii <ishii(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development list <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Re: [COMMITTERS] pgsql: Fix free space map tocorrectly track the total amount of FSM
Date: 2007-10-03 01:07:54
Message-ID: 20071003010753.GF19690@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-committerspgsql-hackers
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.

-- 
Alvaro Herrera                          Developer, http://www.PostgreSQL.org/
"Sallah, I said NO camels! That's FIVE camels; can't you count?"
(Indiana Jones)

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