Du kannst die Session-ID der Abfrage auslesen
SELECT 
    r.session_id,
    r.status,
    r.start_time,
    r.command,
    r.cpu_time,
    r.total_elapsed_time,
    r.reads,
    r.writes,
    r.logical_reads,
    r.wait_type,
    r.wait_time,
    r.last_wait_type,
    r.blocking_session_id,
    t.text AS query_text,
    s.host_name,
    s.program_name,
    s.login_name
FROM 
    sys.dm_exec_requests AS r
JOIN 
    sys.dm_exec_sessions AS s ON r.session_id = s.session_id
CROSS APPLY 
    sys.dm_exec_sql_text(r.sql_handle) AS t
WHERE 
    r.session_id <> @@SPID; -- Eigene Abfrage ausnehmenUnd die Session danach mit
KILL <Session-ID>
beenden.