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Re: [HACKERS] PGUpgrade WAS: Audio interview

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 (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-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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