Re: Major performance problem after upgrade from 8.3 to 8.4

Hello

2010/8/30 Andreas Kretschmer <akretschmer@spamfence.net>:
> 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?
>

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
> --
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