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Hi, many a times the backend are stubborn. A backend is currently executing a Query , the query usually finishes quickly < 5 secs. But this query is on for past many minutes. I want to debug why it is hung if it is hung. I have also tried to kill this query using following methods: SQL> SELECT pg_cancel_backend(27649); # does not kill # kill 27649 # does not kill # kill -TERM 27649 # does not kill # ps auxwww| grep 27649 postgres 27649 0.0 1.9 421060 81576 ? S 10:41 0:00 postgres: tradein tradein_clients 216.247.238.131(59261) SELECT this query does not block any other tradein_clients=# SELECT * from blockers; +---------+---------+ | blocker | blockee | +---------+---------+ +---------+---------+ (0 rows) \d blockers View "public.blockers" +---------+---------+-----------+ | Column | Type | Modifiers | +---------+---------+-----------+ | blocker | integer | | | blockee | integer | | +---------+---------+-----------+ View definition:(Courtesy: Tom Lane) SELECT h.pid AS blocker, w.pid AS blockee FROM ONLY pg_locks h, ONLY pg_locks w WHERE h."granted" AND NOT w."granted" AND (h.relation = w.relation AND h."database" = w."database" OR h."transaction" = w."transaction"); Can anyone please guide what should be done in such situations. Regds mallah. -- Best Regards, regds Mallah. Rajesh Kumar Mallah +---------------------------------------------------+ | Tradeindia.com (3,97,300) Registered Users | | Indias' Leading B2B eMarketPlace | | http://www.tradeindia.com/ | +---------------------------------------------------+ |
