SQL - Desconectar usuarios de una BD

/*Desconectarlos para realizar una restauración, o sacar un .bak-por ejemplo-*/

USE master
DECLARE curkillproc
CURSOR FOR
SELECT spid,dbs.name AS dbname
FROM master..sysprocesses pro, master..sysdatabases dbs
WHERE pro.dbid = dbs.dbid
AND dbs.name = 'mi_base_datos'     --aquí el nombre de la BD
FOR READ ONLY
DECLARE @varspid AS integer
DECLARE @vardbname AS varchar(256)
DECLARE @numUsers AS integer
SET @numUsers = 0
OPEN curkillproc
FETCH NEXT FROM curkillproc
INTO @varspid, @vardbname
WHILE @@fetch_status = 0
BEGIN
EXEC('kill ' + @varspid)
SET @numUsers = @numUsers + 1
FETCH NEXT FROM curkillproc INTO @varspid, @vardbname
END
CLOSE curkillproc
DEALLOCATE curkillproc
SELECT @numUsers as NumUsersDisconnected