From: Andreas Kretschmer <akretschmer@spamfence.net>
To: pgsql-performance@postgresql.org
Subject: Re: Major performance problem after upgrade from 8.3 to 8.4
Date: Mon, 30 Aug 2010 09:22:30 +0200
Message-ID: <20100830072230.GA28373@tux> (raw)
In-Reply-To: <alpine.LFD.2.01.1008300802300.4121@bbs.intern>
References: <alpine.LFD.2.01.1008300802300.4121@bbs.intern>
Gerhard Wiesinger <lists@wiesinger.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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To: pgsql-performance@postgresql.org
Cc: akretschmer@spamfence.net
Subject: Re: Major performance problem after upgrade from 8.3 to 8.4
In-Reply-To: <20100830072230.GA28373@tux>
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