Answers:
--Kick all users off of the database NOW
ALTER DATABASE YourDatabase SET SINGLE_USER WITH ROLLBACK IMMEDIATE
--Kick all but after 60 seconds
ALTER DATABASE YourDatabase SET SINGLE_USER WITH ROLLBACK AFTER 60 SECONDS
--restore connection to users
ALTER DATABASE YourDatabase SET MULTI_USER
分离时是否尝试检查“ Drop Connections”框?