Thread: [GENERAL] I can't cancel/terminate query.

[GENERAL] I can't cancel/terminate query.

From

Edmundo Robles

Date:

13 July 2017, 18:57:46

Hi! i have many too long time queries, the oldest is almost 16 days, so i tried to cancel and terminate with pg_cancel_backend and pg_terminate_backend but queries is still running.

STIME ELAPSED ELAPSED %CPU PID COMMAND

jun27 15-23:05:46 1379146 0.3 29660 postgres: argos_admin bdkairos 127.0.0.1(55605) SELECT

jun27 15-23:05:46 1379146 0.3 29659 postgres: argos_admin bdkairos 127.0.0.1(55604) SELECT

jun27 15-23:05:46 1379146 0.3 29658 postgres: argos_admin bdkairos 127.0.0.1(55603) SELECT

jun27 15-23:05:16 1379116 0.3 29909 postgres: argos_admin bdkairos 127.0.0.1(55767) SELECT

jun27 15-23:04:51 1379091 0.3 30097 postgres: argos_admin bdkairos 127.0.0.1(55909) SELECT

jun27 15-23:03:49 1379029 0.3 30661 postgres: argos_admin bdkairos 127.0.0.1(56303) SELECT

...

What should i do to safely close that queries, before to use kill command in linux?

I have Postgres 9.4 running on debian jessie.

Re: [GENERAL] I can't cancel/terminate query.

From

Melvin Davidson

Date:

13 July 2017, 19:10:20

On Thu, Jul 13, 2017 at 11:57 AM, Edmundo Robles <edmundo@sw-argos.com> wrote:

Hi! i have many too long time queries, the oldest is almost 16 days, so i tried to cancel and terminate with pg_cancel_backend and pg_terminate_backend but queries is still running.

STIME ELAPSED ELAPSED %CPU PID COMMAND
jun27 15-23:05:46 1379146 0.3 29660 postgres: argos_admin bdkairos 127.0.0.1(55605) SELECT
jun27 15-23:05:46 1379146 0.3 29659 postgres: argos_admin bdkairos 127.0.0.1(55604) SELECT
jun27 15-23:05:46 1379146 0.3 29658 postgres: argos_admin bdkairos 127.0.0.1(55603) SELECT
jun27 15-23:05:16 1379116 0.3 29909 postgres: argos_admin bdkairos 127.0.0.1(55767) SELECT
jun27 15-23:04:51 1379091 0.3 30097 postgres: argos_admin bdkairos 127.0.0.1(55909) SELECT
jun27 15-23:03:49 1379029 0.3 30661 postgres: argos_admin bdkairos 127.0.0.1(56303) SELECT
...
What should i do to safely close that queries, before to use kill command in linux?

I have Postgres 9.4 running on debian jessie.

--

To cancel a process with pg_terminate_backend, you need to be a superuser.

So first;

SET ROLE postgres;

Then you should be able to
SELECT pg_terminate_backend(<pid>); Where <pid> is the pid of process you want to termnate.

Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.

Re: [GENERAL] I can't cancel/terminate query.

From

Jerry Sievers

Date:

13 July 2017, 20:21:50

Edmundo Robles <edmundo@sw-argos.com> writes:

> Hi!  i have  many  too long time queries,  the oldest  is  almost 16
> days, so i  tried to cancel and terminate with pg_cancel_backend and
> pg_terminate_backend  but queries is still running.
>
> STIME     ELAPSED ELAPSED %CPU   PID COMMAND
> jun27 15-23:05:46 1379146  0.3 29660 postgres: argos_admin bdkairos
> 127.0.0.1(55605) SELECT                             
> jun27 15-23:05:46 1379146  0.3 29659 postgres: argos_admin bdkairos
> 127.0.0.1(55604) SELECT                             
> jun27 15-23:05:46 1379146  0.3 29658 postgres: argos_admin bdkairos
> 127.0.0.1(55603) SELECT                             
> jun27 15-23:05:16 1379116  0.3 29909 postgres: argos_admin bdkairos
> 127.0.0.1(55767) SELECT                             
> jun27 15-23:04:51 1379091  0.3 30097 postgres: argos_admin bdkairos
> 127.0.0.1(55909) SELECT                             
> jun27 15-23:03:49 1379029  0.3 30661 postgres: argos_admin bdkairos
> 127.0.0.1(56303) SELECT        
> ...
> What should  i do to safely close that  queries, before to use kill
> command in linux? 
>
> I have Postgres 9.4  running on debian jessie.

Try stracing the catatonic backend.  You will probably find it  hung in
a network send like sendv' or somesuch.

The client side of such a connection is probably still alive but can't
take any more data perhaps due to being  resource starved.  Fully
shutdown such a client if you can locate it.

If this is a no-can-do, there's a way to forge a network packet to
close the blocked socket which you'll have to Google for  if interested.

Else you will have to shutdown -m immediate.  Sorry.

>  
>
>
> --
> [uc]
>
>

--
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net
p: 312.241.7800

Re: [GENERAL] I can't cancel/terminate query.

From

Melvin Davidson

Date:

13 July 2017, 22:47:27

On Thu, Jul 13, 2017 at 2:45 PM, Edmundo Robles <edmundo@sw-argos.com> wrote:

i executed the commands many times like superuser but that queries still running :(

On Thu, Jul 13, 2017 at 11:10 AM, Melvin Davidson <melvin6925@gmail.com> wrote:

On Thu, Jul 13, 2017 at 11:57 AM, Edmundo Robles <edmundo@sw-argos.com> wrote:
Hi! i have many too long time queries, the oldest is almost 16 days, so i tried to cancel and terminate with pg_cancel_backend and pg_terminate_backend but queries is still running.

STIME ELAPSED ELAPSED %CPU PID COMMAND
jun27 15-23:05:46 1379146 0.3 29660 postgres: argos_admin bdkairos 127.0.0.1(55605) SELECT
jun27 15-23:05:46 1379146 0.3 29659 postgres: argos_admin bdkairos 127.0.0.1(55604) SELECT
jun27 15-23:05:46 1379146 0.3 29658 postgres: argos_admin bdkairos 127.0.0.1(55603) SELECT
jun27 15-23:05:16 1379116 0.3 29909 postgres: argos_admin bdkairos 127.0.0.1(55767) SELECT
jun27 15-23:04:51 1379091 0.3 30097 postgres: argos_admin bdkairos 127.0.0.1(55909) SELECT
jun27 15-23:03:49 1379029 0.3 30661 postgres: argos_admin bdkairos 127.0.0.1(56303) SELECT
...
What should i do to safely close that queries, before to use kill command in linux?

I have Postgres 9.4 running on debian jessie.

--

To cancel a process with pg_terminate_backend, you need to be a superuser.

So first;

SET ROLE postgres;

Then you should be able to
SELECT pg_terminate_backend(<pid>);   Where <pid> is the pid of process you want to termnate.
--
Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.

--

If you are running on Linux, then:

sudo su

kill <pid>

Where <pid> is the same as in pg_terminate_backend(<pid>)

Melvin Davidson
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.