SQL Server switches the database to single-user and multi-user mode

Sometimes the database is occupied, want to do some operations, unable to operate. You can try to switch the database to single-user mode to operate. Switch back to multi-user mode after the operation is complete.

The command is as follows:

ALTER DATABASE name set Single_user--Single user
ALTER DATABASE name set Multi_user-Multi-user

Or

sp_dboption database name, "Single user", True--

sp_dboption database name, "Single user", false--multi-user

If you use alter DATABAS or if you are using sp_dboption, there is no way to change to multiuser or single-user mode
The solution is
In the activity and monitor process, kill the destination database and then refresh it.
Use
Alter DATABASE Db_tyz and modify it.