Can sql server queries be really cancelled/killed?

Question

I would like to give a user the ability to cancel a running query. The query is really slow. (Query optimization is besides the point.) This is mainly out of my curiosity.

Answer 1

IF you really absolutely want to kill it for good use this approach:

• store away the session ID right before starting the long-running query by calling SELECT @@SPID AS 'SESSIONID' on the same connection

When you want to kill it:

• Open a new DB connection
• issue a KILL command for that session ID
  BEWARE as the MSDN documentation states you need the permission ALTER ANY CONNECTION to do this