> > The only possible explanation for this behavior is that somebody is > > signalling the postmaster due to Xid wraparound issues. This is keyed > > on some GUC vars -- Perhaps you have autovacuum_freeze_max_age set to an > > insane value? > > Doesn't appear to be insane ? > > #autovacuum_freeze_max_age = 200000000 # maximum XID age before forced > vacuum