New in version 3.2.



Terminates an operation as specified by the operation ID. The mongo shell provides the db.killOp() helper. To find operations and their corresponding IDs, see $currentOp or db.currentOp().

The killOp command must be run against the admin database.

To run killOp, use the db.runCommand( { <command> } ) method.

The command has the following form:

{ "killOp": 1, "op": <opid> }
Parameter Type Description
op number An operation ID.


Terminate running operations with extreme caution. Only use killOp to terminate operations initiated by clients and do not terminate internal database operations.

Access Control

On systems running with authorization, to kill operations not owned by the user, the user must have access that includes the killop privilege action.

Changed in version 3.2.9: On mongod instances, users can kill their own operations even without the killop privilege action.


The following example uses killOp to target the running operation with opid 3478.

db.adminCommand( { "killOp": 1, "op": 3478 } )

The operation returns the following result:

{ "info" : "attempting to kill op", "ok" : 1 }

killOp reports success if it succeeded in marking the specified operation for termination. Operations may not actually be terminated until they reach an appropriate interruption point. Use $currentOp or db.currentOp() to confirm the target operation was terminated.