Thanks for your answer on explaining what reload does. Use Case. Looking around, I see there were real problems[1] with sending SIGTERM to individual backends back in 2005 or so, and pg_terminate_backend() was only deemed safe enough to put in for 8.4 [2]. On 11/16/2012 02:34 PM, Harry wrote: > I am facing problem i.e. Sometimes a test in CI takes too long and the system should be destroyed. Is it possible at all or do I want something strange :) ? `pg_terminate_backend' does open up > access to a new behavior, but no concrete risks come to mind. SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE pid = 123456789 AND STATE = 'idle'; -- And Now it doesn't exist.. PostgreSQL: Create Audit Trigger, for logging or Auditing your Database DML Transactions PostgreSQL 9.6: Introduced a pg_blocking_pids function to get blocking process id It looks like I can't cancel big query from foreign table using pg_terminate_backend / pg_cancel_backend. > but when i am trying to kill them manually using pg_terminate_backend (All > IDLE connections are getting killed but, others like declare, select etc.) SELECT pg_cancel_backend() If the process cannot be killed, try: SELECT pg_terminate_backend() But how to apply this to several processes? If i'm using pg_cancel_backend, it just hangs. So, if I have to do a pg_terminate_backend it will a whole bunch of pids I'm talking about. are not getting killed getting result false. I have also seen VACUUM is not a good option. The value of pid can be obtained from the pg_stat_activity catalog table. postgres=# select pg_terminate_backend(30899); WARNING: PID 30899 is not a PostgreSQL server process pg_terminate_backend -----f (1 row) However, we can terminate background workers by pg_terminate_backend. The pg_terminate_backend function requires the pid column or process ID as input. At that time, we need to find that blocking process id which blocked that table so that we can take necessary steps. Note the log line indicating that pg_terminate_backend… SELECT * FROM pg_stat_activity WHERE pid = 123456789 AND STATE = 'idle'; -- NOTE: I tried to use ridiculous pid #'s to help prevent people from copying & pasting and wrecking … – Arun … PostgreSQL 9.6 introduced a pg_blocking_pids() to get a blocking process id of your running transaction. but when i am trying to kill them manually using pg_terminate_backend (All IDLE connections are getting killed but, others like declare, select etc.) connections after execution completed are residing > in pg_stat_activity and pg_stat_database. > are not getting … I saw a lot of pids running the same query. 2017-10-18 15:08:55: pid 37651: FATAL: unable to read data from DB node 0 2017-10-18 15:08:55: pid 37651: DETAIL: EOF encountered with backend: Steps To Reproduce: 1. Once pid is passed as input to the pg_terminate_backend function, all running queries will automatically be canceled and it will terminate a specific connection corresponding to the process ID … In the following example, I terminated the logical replication launcher, and this process did not appear … Call pg_terminate_backend(pid) on a pid from pg_stat_activity() through the pgpool VIP 2. Now this disconnects all sessions of one user and the above prevents new connects by that user: edb=# select pg_terminate_backend(pid) from pg_stat_activity where usename='adam'; pg_terminate_backend ----- t (1 row) The terminated session then gets this output: PostgreSQL: Must know about pg_terminate_backend and pg_cancel_backend before killing to any session PostgreSQL: How to get the list of all Schemas of a database in PSQL? When multiple sessions are trying to access a table, and that table is locked. If I'm using pg_terminate_backend, it returns 'true' but process still exists. 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