On Tue, 2007-02-06 at 12:10 +0900, ITAGAKI Takahiro wrote:
> "Simon Riggs" <[EMAIL PROTECTED]> wrote:
> > > Actually, given what we've just learned --- namely that choosing these
> > > values at random is a bad idea --- I'd want to see a whole lot of
> > > positive evidence before adding such a configuration knob.
> > 
> > 3. assemble performance evidence
> > 
> > Step 3 is always there for performance work, so even if you don't
> > mention it, I'll assume everybody wants to see that as soon as possible
> > before we progress.
> There was a performance evidence using TOAST in order to partial updates.
> It added a flag of force toasting. The toast threshold suggested now is
> more flexible than it, but I think it is one of the evidences.
>   Vertical Partitioning with TOAST
>   http://archives.postgresql.org/pgsql-hackers/2005-12/msg00013.php

Apologies to Junji-san. I'd thought my idea was original, but it seems
we think along similar lines.

That is the kind of performance gain I see possible.

  Simon Riggs             
  EnterpriseDB   http://www.enterprisedb.com

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