> This could be just about anything. Which OS are you running? Did you
> check any logs when everything went crazy?
Sorry, should have been more verbose.
OS is debian squeeze, pg installed is the latest 9.2.1 from
pgapt.debian.net. Logs where checked, no errors/warnings at all. Query
plans have been checked, no changes before/after. The changed behavior
only manifested in the drop of the number of transactions/second
executed and the massively increased load in the machine. No increased
I/O or anything.
Since A has been promoted to master, everything behaves like expected,
the 9.2 outperformes the 9.0 easily, as expected.