| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Jeff Davis <pgsql(at)j-davis(dot)com> |
| Cc: | Hannu Krosing <hannu(at)skype(dot)net>, PostgreSQL advocacy <pgsql-advocacy(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] PGUpgrade WAS: Audio interview |
| Date: | 2006-02-12 20:37:10 |
| Message-ID: | 20060212203710.GB5208@surnet.cl |
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| Thread: | |
| Lists: | pgsql-advocacy pgsql-hackers |
Jeff Davis wrote:
> Hannu Krosing wrote:
> >
> > How hard would it be to modify postgres so that it can handle multiple
> > heap page formats ?
>
> If the on-disk format is changed to add a feature (rather that for some
> performance reason), then that would mean that the feature would have to
> be available or not per disk page. Wouldn't that cause problems?
Yeah, it would be problematic and difficult to handle. For example in
subtransactions it would be a hassle to handle the 7.4 heap page format,
maybe impossible without race conditions.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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