在对象资源管理器上的MS SQL Server Management Studio中，右键单击数据库。在下面的上下文菜单中选择“任务->脱机”

这些对我不起作用(SQL2008 Enterprise)，我也看不到任何正在运行的进程或连接到DB的用户。重新启动服务器(右键单击Management Studio中的Sql server并选择重新启动)允许我恢复DB。

在对象资源管理器上的MS SQL Server Management Studio中，右键单击数据库。在下面的上下文菜单中选择“任务->脱机”

我总是用:

ALTER DATABASE DB_NAME SET SINGLE_USER WITH ROLLBACK IMMEDIATE 
GO 
SP_RENAMEDB 'DB_NAME','DB_NAME_NEW'
Go 
ALTER DATABASE DB_NAME_NEW  SET MULTI_USER -- set back to multi user 
GO 

ALTER DATABASE [Test]
SET OFFLINE WITH ROLLBACK IMMEDIATE

ALTER DATABASE [Test]
SET ONLINE

下面是如何在MS SQL Server Management Studio 2008(可能也适用于其他版本)中可靠地执行这类事情:

In the Object Explorer Tree, right click the root database server (with the green arrow), then click activity monitor. Open the processes tab in the activity monitor, select the 'databases' drop down menu, and filter by the database you want. Right click the DB in Object Explorer and start a 'Tasks -> Take Offline' task. Leave this running in the background while you... Safely shut down whatever you can. Kill all remaining processes from the process tab. Bring the DB back online. Rename the DB. Bring your service back online and point it to the new DB.