| From: | Manfred Koizar <mkoi-pg(at)aon(dot)at> |
|---|---|
| To: | Shridhar Daithankar <shridhar_daithankar(at)persistent(dot)co(dot)in> |
| Cc: | pgsql-general(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Buglist |
| Date: | 2003-08-22 14:09:44 |
| Message-ID: | 2c8ckvohaof9g46iq3d46ccvtv8ikjif2l@4ax.com |
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| Lists: | pgsql-general pgsql-hackers |
On Fri, 22 Aug 2003 16:27:53 +0530, Shridhar Daithankar
<shridhar_daithankar(at)persistent(dot)co(dot)in> wrote:
>What does FSM does then?
FSM = Free Space Map. VACUUM writes information into the FSM, INSERTs
consult the FSM to find pages with free space for new tuples.
> I was under impression that FSM stores page
>pointers and vacuum work on FSM information only. In that case, it wouldn't
>have to waste time to find out which pages to clean.
This has been discussed yesterday here and on -hackers ("Decent VACUUM
(was: Buglist)"). We were talking about inventing a second data
structure: RSM.
Servus
Manfred
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