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List:       postgresql-general
Subject:    Re: [HACKERS] Pre-allocated free space for row
From:       Simon Riggs <simon () 2ndquadrant ! com>
Date:       2005-08-31 21:07:04
Message-ID: 1125522424.3956.4.camel () localhost ! localdomain
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On Wed, 2005-08-31 at 16:50 +0900, Satoshi Nagayasu wrote:
> Simon Riggs wrote:
> >>4. Allow to repair fragmentation in each page.
> >>
> >>Because updates cause fragmentation in the page.
> >>
> >>So we need to keep large continuous free space in each page,
> >>if we want to get more effective on PCTFREE feature.
> > 
> > 
> > ...doesn't VACUUM already do that?
> 
> VACUUM generates a huge load because it repaires all pages
> on the table file.
> 
> I think (more light-weight) repairing on a single page
> is needed to maintain free space in the specific page.

So PCTFREE is an OK idea, but lets drop #4, which is a separate idea and
not one that has gained agreeable consensus.

Best Regards, Simon Riggs


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