SHOW PROCESSLIST

Use the SHOW PROCESSLIST command to display the current workload of the system. The output of this command consists of id, user, host, database, time, and info.

The following table explains the output in detail:

Output	Description
worker_id	The id of the worker running the process.
id	The id of the process.
user	The username associated with the process.
host	The host to which the client is connected.
database	The database if one is selected.
time	The elapsed time since the running sql.
info	The statement being executed.

This command only shows the frontend received processlist now.

Syntax

SHOW PROCESSLIST;

Example

SHOW PROCESSLIST;
------RESULT
 Worker Id | Id  | User |      Host       | Database |  Time  |         Info          
-----------+-----+------+-----------------+----------+--------+-----------------------
 2         | 2:0 | root | 127.0.0.1:50447 | dev      | 4114ms | SELECT pg_sleep(3600)
 3         | 3:1 | root | 127.0.0.1:50457 | dev      | 6ms    | SHOW PROCESSLIST
 3         | 3:0 | root | 127.0.0.1:50453 | dev      | 2844ms | SELECT pg_sleep(3600)
(3 rows)

Terminate the process

After using the SHOW PROCESSLIST command to display the running processes, you can terminate them by the KILL command.

Syntax

KILL id;

Example

SHOW PROCESSLIST;
------RESULT
 Worker Id | Id  | User |      Host       | Database |  Time  |         Info          
-----------+-----+------+-----------------+----------+--------+-----------------------
 2         | 2:0 | root | 127.0.0.1:50447 | dev      | 4114ms | SELECT pg_sleep(3600)
 3         | 3:1 | root | 127.0.0.1:50457 | dev      | 6ms    | SHOW PROCESSLIST
 3         | 3:0 | root | 127.0.0.1:50453 | dev      | 2844ms | SELECT pg_sleep(3600)
(3 rows)

KILL '2:0';
------RESULT
KILL

KILL '3:0';
------RESULT
KILL

SHOW PROCESSLIST;
------RESULT
 Worker Id | Id  | User |      Host       | Database | Time |       Info       
-----------+-----+------+-----------------+----------+------+------------------
 2         | 2:0 | root | 127.0.0.1:50447 | dev      |      | 
 3         | 3:1 | root | 127.0.0.1:50457 | dev      | 2ms  | SHOW PROCESSLIST
 3         | 3:0 | root | 127.0.0.1:50453 | dev      |      | 
(3 rows)