Re: Clustering system catalog indexes

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От Bruce Momjian
Тема Re: Clustering system catalog indexes
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Msg-id 200405200258.i4K2wWD20880@candle.pha.pa.us
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Ответ на Re: Clustering system catalog indexes  (Alvaro Herrera <alvherre@dcc.uchile.cl>)
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Alvaro Herrera wrote:
> On Wed, May 19, 2004 at 09:43:22PM -0400, Bruce Momjian wrote:
> > Christopher Kings-Lynne wrote:
> > > Is it worth us marking any system catalog indexes as clusterable by 
> > > default for performance?
> > 
> > Not sure. Most of the system stuff is loaded in a pretty good order, and
> > cluster is only good if you are going after seveal rows of identical
> > value or similar value in the same table, and I can't think of a case
> > where this would help.  Can others?  It is a good question.
> 
> pg_attribute maybe?

Ah, good point.  Because of vacuum reuse, it could grab rows in
different locations when creating a table.  Good point.

Added to TODO:
       o Add default clustering to system tables

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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