RE: psql help

Sorry, there is no problem with the following statement and the environment variable. It works fine. But it terminates only one PID due to LIMIT 1. I want to terminate all pids that meet this criteria. If I remove LIMIT 1, pg_terminate_backend(pid) will not work as it expects only one pid at a time. So, the question is how to rewrite this psql so it loops through all pids one pid at a time? Thanks in advance for your help.

SELECT pid, pg_terminate_backend(pid) FROM pg_stat_activity
WHERE pid IN (select unnest(pg_blocking_pids(pid)) from pg_stat_activity where cardinality(pg_blocking_pids(pid)) > 0)
and usename = 'DBUSER_10'
and now() - state_change >= interval $a'${TIMEOUT_MINS}'$a
order by now() - state_change >= interval $a'${TIMEOUT_MINS}'$a desc limit 1;

From: David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>
Sent: Thursday, July 4, 2024 8:17 PM
To: Murthy Nunna <mnunna(at)fnal(dot)gov>
Cc: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: psql help

[EXTERNAL] – This message is from an external sender
On Thu, Jul 4, 2024 at 4:56 PM Murthy Nunna <mnunna(at)fnal(dot)gov<mailto:mnunna(at)fnal(dot)gov>> wrote:

How can I rewrite the above in psql

The only real trick is using a psql variable instead of the shell-injection of the environment variable. Use the --set CLI argument to assign the environment variable to a psql variable then refer to it in the query using :'timout_mins'

Removing the limit 1 should be as simple as not typing limit 1 when you bring the query into the psql script.

David J.