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Re: HOT - preliminary results

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Pavan Deolasee <pavan(dot)deolasee(at)enterprisedb(dot)com>
Cc: Zeugswetter Andreas ADI SD <ZeugswetterA(at)spardat(dot)at>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: HOT - preliminary results
Date: 2007-03-02 20:52:47
Message-ID: 200703022052.l22KqlA05071@momjian.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Pavan Deolasee wrote:
> Zeugswetter Andreas ADI SD wrote:
> >>> accounts       157895  (initial size)       49284 (increase)
> >>> accounts_pkey  19709   (initial size)       19705 (increase)
> >>>
> >>>
> >> Just to clarify, the relation size and increase is in number
> >> of blocks.
> >
> > The numbers are quite impressive :-) Have you removed the selects on
> > accounts too ?
> 
> Yes. In the first set of results, SELECT on accounts is removed.
> 
> > Seems that should also show improvements.
> >
> > Do you prune chains during update also ?
> 
> Yes, we do prune the chains during UPDATE, but only when we
> run out of free space and LP_DELETEd items on the page.
> And we prune all chains on the page in that case.

Yep, that seems the most efficient approach.

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>          http://momjian.us
  EnterpriseDB                               http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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