1. 查看当前的连接

SELECT conn.session_id, host_name, program_name,
nt_domain, login_name, connect_time, last_request_end_time 
FROM sys.dm_exec_sessions AS sess
JOIN sys.dm_exec_connections AS conn
ON sess.session_id = conn.session_id;

2. 断掉当前的连接

KILL [Session_ID]

3. 查看当前的未完成的事务

select *
from sys.dm_tran_session_transactions 
where is_user_transaction=1;