public inbox for [email protected]  

help / color / mirror / Atom feed

From: Murthy Nunna <[email protected]>
To: [email protected] <[email protected]>
To: David G. Johnston <[email protected]>
Subject: RE: psql help
Date: Fri, 5 Jul 2024 03:54:56 +0000
Message-ID: <DM8PR09MB66770B55E691C9685E5B5F7BB8DF2@DM8PR09MB6677.namprd09.prod.outlook.com> (raw)
In-Reply-To: <CAKFQuwaYLtg0W4He0VGfqSTKSj+69sSq_5esqBVTHwSrPfMLmw@mail.gmail.com>
References: <DM8PR09MB6677C5B4FDBDFC0F82298DC7B8DE2@DM8PR09MB6677.namprd09.prod.outlook.com>
	<CAKFQuwaYLtg0W4He0VGfqSTKSj+69sSq_5esqBVTHwSrPfMLmw@mail.gmail.com>

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 <[email protected]>
Sent: Thursday, July 4, 2024 8:17 PM
To: Murthy Nunna <[email protected]>
Cc: [email protected]
Subject: Re: psql help


[EXTERNAL] – This message is from an external sender
On Thu, Jul 4, 2024 at 4:56 PM Murthy Nunna <[email protected]<mailto:[email protected]>> 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.

view thread (3+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: RE: psql help
  In-Reply-To: <DM8PR09MB66770B55E691C9685E5B5F7BB8DF2@DM8PR09MB6677.namprd09.prod.outlook.com>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox