How come I don't see any activities from pg_stat_user_tables
pg=> select relid, n_tup_ins, n_tup_upd, n_tup_del from pg_stat_user_tables;
relid | n_tup_ins | n_tup_upd | n_tup_del
-------+-----------+-----------+-----------
16557 | 0 | 0 | 0
16562 | 0 | 0 | 0
16567 | 0 | 0 | 0
16573 | 0 | 0 | 0
16578 | 0 | 0 | 0
16583 | 0 | 0 | 0
16588 | 0 | 0 | 0
16594 | 0 | 0 | 0
16600 | 0 | 0 | 0
16606 | 0 | 0 | 0
16612 | 0 | 0 | 0
16618 | 0 | 0 | 0
16624 | 0 | 0 | 0
16630 | 0 | 0 | 0
16636 | 0 | 0 | 0
16642 | 0 | 0 | 0
16647 | 0 | 0 | 0
16652 | 0 | 0 | 0
16657 | 0 | 0 | 0
16663 | 0 | 0 | 0
16669 | 0 | 0 | 0
16675 | 0 | 0 | 0
16681 | 0 | 0 | 0
16686 | 0 | 0 | 0
16692 | 0 | 0 | 0
16698 | 0 | 0 | 0
16704 | 0 | 0 | 0
16709 | 0 | 0 | 0
16715 | 0 | 0 | 0
16721 | 0 | 0 | 0
16727 | 0 | 0 | 0
16733 | 0 | 0 | 0
16739 | 0 | 0 | 0
16745 | 0 | 0 | 0
16750 | 0 | 0 | 0
16756 | 0 | 0 | 0