"Wojciech Sobczuk" <wojtek@nemo.pl> writes:
> The only thing which helps then is
> hard-restarting postgresql - and then it works fine for another 6 days.
> Rebooting the machine has no influence on the performance so it seems to be
> a postgresql issue.
BTW, exactly what do you mean by "hard-restarting postgresql"?
A machine reboot would certainly include a postmaster restart, so
you seem to be using that term to mean something else than what most
of us would consider it to mean.
regards, tom lane