New in v2.1: The CANCEL SESSION
statement lets you stop long-running sessions. CANCEL SESSION
will attempt to cancel the currently active query and end the session.
Required privileges
Only members of the admin
role and the user that the session belongs to can cancel a session. By default, the root
user belongs to the admin
role.
Synopsis
Parameters
Parameter | Description |
---|---|
session_id |
The ID of the session you want to cancel, which can be found with SHOW SESSIONS .CANCEL SESSION accepts a single session ID. If a subquery is used and returns multiple IDs, the CANCEL SESSION statement will fail. To cancel multiple sessions, use CANCEL SESSIONS . |
select_stmt |
A selection query that returns session_id (s) to cancel. |
Example
Cancel a single session
In this example, we use the SHOW SESSIONS
statement to get the ID of a session and then pass the ID into the CANCEL SESSION
statement:
> SHOW SESSIONS;
+---------+----------------------------------+-----------+...
| node_id | session_id | user_name |...
+---------+----------------------------------+-----------+...
| 1 | 1530c309b1d8d5f00000000000000001 | root |...
+---------+----------------------------------+-----------+...
| 1 | 1530fe0e46d2692e0000000000000001 | maxroach |...
+---------+----------------------------------+-----------+...
> CANCEL SESSION '1530fe0e46d2692e0000000000000001';
You can also cancel a session using a subquery that returns a single session ID:
> CANCEL SESSIONS (SELECT session_id FROM [SHOW SESSIONS]
WHERE username = 'root');
Cancel multiple sessions
Use the SHOW SESSIONS
statement to view all active sessions:
> SHOW SESSIONS;
+---------+----------------------------------+-----------+...
| node_id | session_id | user_name |...
+---------+----------------------------------+-----------+...
| 1 | 1530c309b1d8d5f00000000000000001 | root |...
+---------+----------------------------------+-----------+...
| 1 | 1530fe0e46d2692e0000000000000001 | maxroach |...
+---------+----------------------------------+-----------+...
| 1 | 15310cc79671fc6a0000000000000001 | maxroach |...
+---------+----------------------------------+-----------+...
To cancel multiple sessions, nest a SELECT
clause that retrieves session_id
(s) inside the CANCEL SESSIONS
statement:
> CANCEL SESSIONS (SELECT session_id FROM [SHOW SESSIONS]
WHERE user_name = 'maxroach');
All sessions created by maxroach
will be cancelled.