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Re: Major performance problem after upgrade from 8.3 to8.4

From: Andreas Kretschmer <akretschmer(at)spamfence(dot)net>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Major performance problem after upgrade from 8.3 to8.4
Date: 2010-08-30 07:22:30
Message-ID: 20100830072230.GA28373@tux (view raw or flat)
Thread:
Lists: pgsql-performance
Gerhard Wiesinger <lists(at)wiesinger(dot)com> wrote:

> I know that the data model is key/value pairs but it worked well in 8.3. 
> I need this flexibility.
>
> Any ideas?

If i understand the query correctly it's a pivot-table, right?

If yes, and if i where you, i would try to rewrite this query, to
something like:

select
  timestamp,
  sum (case when keyid = 1 then value else 0 end) as Raumsolltemperatur,
  ...
from
  log
group by
  timestamp;


Assuming you can read a german text:
http://www.pg-forum.de/h-ufig-gestellte-fragen-faq/4067-faq-zeilen-zu-spalten.html



Andreas
-- 
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect.                              (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly."   (unknown)
Kaufbach, Saxony, Germany, Europe.              N 51.05082°, E 13.56889°

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Next:From: Gerhard WiesingerDate: 2010-08-30 07:25:01
Subject: Re: Major performance problem after upgrade from 8.3 to 8.4
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