Richard Huxton <dev@xxxxxxxxxxxx> writes: > Hmm - odd that you're not getting any connection details. Not really; the autovacuum process doesn't have any connection, so those log_line_prefix fields will be left empty. The weird thing about this is why the large maintenance_work_mem works for a regular session and not for autovacuum. There really shouldn't be much difference in the maximum workable setting for the two cases, AFAICS. Your later suggestion to check out the postgres user's ulimit -a settings seems like the appropriate next step, but I'm not seeing how ulimit would affect only some of the postmaster's children. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster