| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Free Space Map thoughts |
| Date: | 2007-11-09 09:29:28 |
| Message-ID: | 1194600568.4251.372.camel@ebony.site |
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| Lists: | pgsql-hackers |
On Thu, 2007-11-08 at 21:50 -0300, Alvaro Herrera wrote:
> Simon Riggs wrote:
>
> > Presumably we would not store an FSM for small tables? On the basis that
> > the purpose of the FSM is to save on pointless I/O there must be a size
> > of table below which an FSM is just overhead.
>
> Hmm, do you mean that we would open and verify every page of a small
> relation until we find one with free space? That doesn't sound very
> good.
I was trying to guess at Heikki's reason for saying the FSM should be in
a separate file. If we have one extra file per table that seems like a
huge number of additional files, with space and fsync implications.
Let's wait and see what Heikki's answer is.
--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com
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