Hi, I am using postgres 9.5 Yes,I restarted the server after changing the autovacuum to off. Also verified that autovacuum process is not running. standby db configurations: (mostly default conf only) hot_standby = on max_standby_archive_delay = 30s max_standby_streaming_delay = 30s wal_receiver_status_interval = 10s hot_standby_feedback = off wal_receiver_timeout = 60s wal_retrieve_retry_interval = 5s -- View this message in context: http://postgresql.nabble.com/Update-or-Delete-causes-canceling-of-long-running-slave-queries-tp5903250p5903334.html Sent from the PostgreSQL - general mailing list archive at Nabble.com. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general