Rui DeSousa wrote: > Is there a reason vacuum will not remove dead tuples other than the usual suspects? > There are no two phase transactions and even after a restoring the database > from binary backup with nothing connect to the restored instance; > vacuum still does not remove the dead tuples. There are three possibilities: 1) Active transactions: SELECT backend_xmin, xact_start, datname, pid, query FROM pg_stat_activity WHERE state <> 'idle' ORDER BY xact_start; 2) Prepared transactions: SELECT xid, prepared FROM pg_prepared_xacts; 3) Lagging replication slots: SELECT xmin, slot_name, active, active_pid FROM pg_replication_slots; The "xid" columns will tell you which tuples VACUUM can remove: Any tuple with "xmax" less than this are fair game. Yours, Laurenz Albe -- Sent via pgsql-admin mailing list (pgsql-admin@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
