From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | Andreas Kretschmer <akretschmer(at)spamfence(dot)net> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Major performance problem after upgrade from 8.3 to 8.4 |
Date: | 2010-08-30 07:34:36 |
Message-ID: | AANLkTi=Te9ToTG-bqVy+fHQ0wM1YWv0nhBqqYiTk2ePg@mail.gmail.com |
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Lists: | pgsql-performance |
Hello
2010/8/30 Andreas Kretschmer <akretschmer(at)spamfence(dot)net>:
> 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?
>
no - it's just EAV table on very large data :(
Regards
Pavel Stehule
> 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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