"Evert Daman" <e.daman@xxxxxxxxxx> writes: > we had never used the vacuum before (database was up > for about two months). after doing that too things were > speeding up again. but that couldn't be the cause of the > lost user could it? It could be, if you'd managed to execute 2 billion transactions in two months ... which seems a bit implausible. But in any case, please read the documentation about required routine maintenance. regards, tom lane