| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Dimitri Fontaine <dfontaine(at)hi-media(dot)com>, pgsql-admin(at)postgresql(dot)org, Chris Hoover <revoohc(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us> |
| Subject: | Re: Where to find information on the new HOT tables? |
| Date: | 2008-02-06 15:40:22 |
| Message-ID: | 20080206154022.GB17371@alvh.no-ip.org |
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| Lists: | pgsql-admin |
Tom Lane escribió:
> Dimitri Fontaine <dfontaine(at)hi-media(dot)com> writes:
> > Le Tuesday 05 February 2008 21:28:31 Alvaro Herrera, vous avez crit:
> >> Perhaps there is a user-level document somewhere.
>
> > I don't think such a document already exists, even rtfm_please doesn't know
> > about any as of now.
>
> The reason there isn't one is it doesn't need one; it's an
> implementation detail not a user-visible feature.
One reason to think it needs to be explained is that it affects how you
plan for VACUUM. In tables where HOT is in charge of a large part of
cleanup, you need to do a lot less vacuuming than you were for 8.2. In
that sense it is very much user-visible.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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