Hi, I'm wondering if following behavior of PostgreSQL regarding lock conflict is an expected one. Here's a scenario:
Session A: BEGIN; SELECT * FROM pg_class limit 1; -- acquires access share lock Session B: BEGIN; ALTER TABLE pg_class ....; -- waits for acquiring access exclusive lock(wil fail anyway though) Session C: SELECT * FROM pg_class...; -- whatever query which needs to acces pg_class will be blocked, too bad... I understand that B should wait for aquiring lock, but Should C wait for? Also, it seems that an attacker could do a denial service attack if he could open session A and B, since other users on session C or following sessions will be blocked. -- Tatsuo Ishii SRA OSS, Inc. Japan -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers