以下为引用的内容：

USE MASTER

GO

SP_CONFIGURE 'ALLOW UPDATES',1

RECONFIGURE WITH OVERRIDE

GO

UPDATE SYSDATABASES SET STATUS =32768 WHERE NAME='msdb'

Go

sp_dboption 'msdb', 'single user', 'true'

Go

DBCC CHECKDB('msdb')

Go

update sysdatabases set status =28 where name='msdb'

Go

sp_configure 'allow updates', 0

reconfigure with override

Go

sp_dboption 'msdb', 'single user', 'false'

Go