On Mon, 30 Aug 2010, Pavel Stehule wrote:
2010/8/30 Gerhard Wiesinger <lists@xxxxxxxxxxxxx>:
On Mon, 30 Aug 2010, Pavel Stehule wrote:
Hello
2010/8/30 Andreas Kretschmer <akretschmer@xxxxxxxxxxxxx>:
Gerhard Wiesinger <lists@xxxxxxxxxxxxx> 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 :(
Yes, it is an EAV table, but with query space comparable low (Max. 1 day out
of years, typically 5mins out of years).
it is irelevant - there are repeated seq scans - so you need a
partitioning or classic table - maybe materialized views can help
I know the drawbacks of an EAV design but I don't want to discuss that. I
want to discuss the major performance decrease of PostgreSQL 8.3
(performance was ok) to PostgreSQL 8.4 (performance is NOT ok).
Any further ideas how I can track this down?
Can someone explain the difference in query plan from an optimizer point
of view?
Thnx.
Ciao,
Gerhard
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