SQL Server中的cmd_shell组件功能强大，几乎可通过该组建实现Windows系统的所有功能，正因此，这个组件也是SQL Server的最大安全隐患。SQL Server 2000中这个组件是默认开启的，而SQL Server 2005中这个组件默认作为此服务器安全配置的一部分而被关闭。有时我们需要用到该组件，开启此组件的相关语句如下：
EXEC sp_configure 'show advanced options', 1
GO
--To update the currently configured value for advanced options.
RECONFIGURE
GO -- To enable the feature.
EXEC sp_configure 'xp_cmdshell', 1
GO
--To update the currently configured value for this feature.
RECONFIGURE
GO
EXEC sp_configure 'show advanced options', 1
GO
--To update the currently configured value for advanced options.
RECONFIGURE
GO -- To enable the feature.
EXEC sp_configure 'xp_cmdshell', 0
GO
--To update the currently configured value for this feature.
RECONFIGURE
GO
