Two processes work on app_test and app_test2 database. You can use the pg_terminate_backend() function to terminate the database session that is blocking your VACUUM. Regardless of whatever issues you might have, pg_cancel_backend cancels the backend's current query. (Tatsuo Ishii) Fix segfault in pgpool child process in certain case. Abandoned replication slots: A replication slot is a data structure that keeps the PostgreSQL server from discarding information that is still needed by a … The two tasks above cannot drop/created databases because the main command still holds the connection. But an idle backend doesn't have a current query, which is what makes it idle. If the running query is not at a point where it will check for interrupts, it will just keep running. connection . This signal should not be In case it does not work, you can be a bit more aggressive by killing the connection: ActiveRecord :: Base . Terminate tells the backend itself to … The first method we can use is SELECT pg_cancel_backend(pid).It simply cancels the query and keeps the connection untouched. To terminate a backend process cleanly, send SIGTERM to that process. SELECT pg_terminate_backend(); SELECT pg_terminate_backend(54321); Once the blocking process is canceled, DROP TABLE query can get its lock and should run successfully. client application is hanging (or paused) and does not receive any data from the server, in this case keepalive works fine and the send() syscall will never end, even when a TERM signal was sent to it, because PostgreSQL is using SA_RESTARTflag for signal processing and SO_SNDTIMEO is not used at all (see man 7 signal). general - pg_terminate_backend not working, pg_terminate_backend not working. I have used pcp_attach_node with pgpool's port number, not pcp's. To cancel a currently running query, first retrieve the process ID for the query that you want to cancel. Examples. (Tatsuo Ishii) This issue can be reproduced with the following steps: Shutdown all backends. execute ( "SELECT pg_terminate_backend( #{ pid } )" ) Alternatively, you can go for “turn it off and on again ” approach by killing all the active database connections and restarting the Ruby processes. Test: Fix occasional 073.pg_terminate_backend test failure. Depending on the query, that might be anything from seconds to hours before it stops. Connect to pgpool with invalid client. You want pg_terminate_backend.. More fundamentally, it seems like you have an application problem or a connection pooler problem, but you haven't described them enough for us to give advice. Unlike the previous one, it not only terminates the query but also shuts down the whole database connection. See also pg_cancel_backend and pg_terminate_backend in Section 9.26.2 for the SQL-callable equivalents of these two actions. END), you can terminate the session in which the query is running by using the PG_TERMINATE_BACKEND function. The postgres server uses SIGQUIT to tell subordinate server processes to terminate without normal cleanup. SELECT pg_terminate_backend(25263) FROM pg_stat_activity WHERE -- don't kill my own connection! The workaround I can see on the build machine is this set of commands (create the dev database too). pg_terminate_backend() or pg_cancel_backend() (those functions return true but the entries in pg_stat_activity remain), and they persist long after the client application has exited - there were some I found on a staging server that were a month old, and were only resolved by Due to that, cancel often seems like it didn't work. But sometimes it may not work and you may be forced to use more violent query: SELECT pg_terminate_backend(pid). Hi Team , We are observing long running process hung in active state on one of our db from last two days Revisiting this, there are places where PostgreSQL backends are doing work …