KILL CONNECTION and KILL QUERY

Syntax

KILL CONNECTION <internal_process_id> [<node_id>]
KILL QUERY <internal_process_id> [<node_id>]
KILL QUERY COMPILE <query_id> [<node_id>]

Arguments

• query_id - see note below.

• internal_process_id - ID of the thread to kill.

• node_id - ID of the node (aggregator) on which the query/thread is running. If the node_id is not specified, the query/thread running on the current node is killed.

  Important

  You can query the information_schema.MV_PROCESSLIST table for the required parameter values, where the ID field in the table contains the thread/internal process ID and the NODE_ID field contains the ID of the node.

  For KILL QUERY COMPILE, get the ID for the query from the LMV_ASYNC_COMPILES table, ID column.

Remarks

• internal_process_id - ID of the thread to kill, which can be found by running SHOW_PROCESSLIST.

• KILL CONNECTION will disconnect the client associated with internal_process_id. This is the default, meaning that running KILL <> will have the same result.

• KILL QUERY allows you to kill a query running on any aggregator in the cluster.

• KILL QUERY will not disconnect the client associated with internal_process_id. Instead, the client will receive an error.

• Any query running on the connection will be rolled back.

• SingleStore checks for the kill bit during any potentially long running loop during query execution and rolls back the query’s transaction if the kill bit is set.

• This command should be run on the master aggregator or a child aggregator node (see Node Requirements for SingleStore Commands).

  Note

  When killing queries on remote nodes (if a user specifies a node_id), the query will only be killed if the user has the PROCESS privilege or if sync_permissions is enabled.

• Refer to the Permission Matrix for the required permission.

Example

KILL CONNECTION 3123;
Query OK, 0 rows affected (0.00 sec)

Stopping a query compile:

SELECT * FROM information_schema.lmv_async_compiles;

+--------+--------+--------------------------------------------------------+-------------------+---------+
| ID     | PID    | QUERY_TEXT                                             | TIME_SINCE_SUBMIT | STATUS  |
+--------+--------+--------------------------------------------------------+-------------------+---------+
| 210812 | 899514 | Query (null).'SELECT * FROM accounts WHERE < ... >.  ' |             0.000 | running |
+--------+--------+--------------------------------------------------------+-------------------+---------+

KILL QUERY COMPILE 210812;

Related Topics

• SHOW PROCESSLIST