Re: Major performance problem after upgrade from 8.3 to 8.4

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 to 8.4
Date: 2010-08-30 07:22:30
Message-ID: 20100830072230.GA28373@tux
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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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