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.
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