Sorry, for the unfinished text, So, I run a long transaction with a lot of data, and after a while I got the messages: NOTICE: max_fsm_relations(1000) equals the number of relations checked HINT: You have at least 1000 relations. Consider increasing the configuration parameter "max_fsm_relations". LOG: max_fsm_relations(1000) equals the number of relations checked HINT: You have at least 1000 relations. Consider increasing the configuration parameter "max_fsm_relations". STATEMENT: VACUUM FATAL: could not reattach to shared memory (key=324, addr=021A0000): 487 And the process stops. Why ? What to do ? TIA, Sabin -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general