Kill Query

Retrieve the List of Queries

Syntax:

SHOW PROCESSLIST;

This command displays all current connections to the FE and the list of queries being executed on each connection. For example:

SHOW PROCESSLIST;
+------------------+------+------+--------------------+---------------------+----------+---------+---------+------+-------+-----------------------------------+---------------------------------------------------------------------------------------+
| CurrentConnected | Id   | User | Host               | LoginTime           | Catalog  | Db      | Command | Time | State | QueryId                           | Info                                                                                  |
+------------------+------+------+--------------------+---------------------+----------+---------+---------+------+-------+-----------------------------------+---------------------------------------------------------------------------------------+
| Yes              |   48 | root | 10.16.xx.xx:44834   | 2023-12-29 16:49:47 | internal | test | Query   |    0 | OK    | e6e4ce9567b04859-8eeab8d6b5513e38 | SHOW PROCESSLIST                                                                      |
|                  |   50 | root | 192.168.xx.xx:52837 | 2023-12-29 16:51:34 | internal |      | Sleep   | 1837 | EOF   | deaf13c52b3b4a3b-b25e8254b50ff8cb | SELECT @@session.transaction_isolation                                                |
|                  |   51 | root | 192.168.xx.xx:52843 | 2023-12-29 16:51:35 | internal |      | Sleep   |  907 | EOF   | 437f219addc0404f-9befe7f6acf9a700 | /* ApplicationName=DBeaver Ultimate 23.1.3 - Metadata */ SHOW STATUS                  |
|                  |   55 | root | 192.168.xx.xx:55533 | 2023-12-29 17:09:32 | internal | test | Sleep   |  271 | EOF   | f02603dc163a4da3-beebbb5d1ced760c | /* ApplicationName=DBeaver Ultimate 23.1.3 - SQLEditor <Console> */ SELECT DATABASE() |
|                  |   47 | root | 10.16.xx.xx:35678   | 2023-12-29 16:21:56 | internal | test | Sleep   | 3528 | EOF   | f4944c543dc34a99-b0d0f3986c8f1c98 | select * from test                                                                    |
+------------------+------+------+--------------------+---------------------+----------+---------+---------+------+-------+-----------------------------------+---------------------------------------------------------------------------------------+
5 rows in set (0.00 sec)

• Id is the unique identifier for the connection, also known as processlist_id.
• QueryId is the unique identifier for the query.

Kill Query

Syntax:

KILL QUERY query_id | processlist_id

This command is used to terminate a specific query or the query being executed on a specific connection. For example:

kill query 55;
Query OK, 0 rows affected (0.01 sec)

This terminates the query currently running on the connection with Id=55, but the connection itself remains active.

kill query 'f02603dc163a4da3-beebbb5d1ced760c';
Query OK, 0 rows affected (0.01 sec)

This terminates the query with QueryId=f02603dc163a4da3-beebbb5d1ced760c, which is actually the same query as the one with processlist_id=55.

Kill Connection

Syntax:

KILL CONNECTION processlist_id

For example:

kill CONNECTION 55;
Query OK, 0 rows affected (0.01 sec)

This command disconnects the connection with Id=55, and any query currently being executed on this connection will also be canceled.