USE   MASTER   
GO   
SP_CONFIGURE 'ALLOW UPDATES',1
GO
RECONFIGURE WITH OVERRIDE   
GO   
UPDATE SYSDATABASES SET STATUS =32768 WHERE NAME='置疑的数据库名'   
Go   
sp_dboption '置疑的数据库名','single user','true'   
Go   
DBCC CHECKDB('置疑的数据库名')     
Go   
update sysdatabases set status=28 where name='置疑的数据库名'   
Go   
sp_configure 'allow updates',0
GO
reconfigure with override   
Go     
sp_dboption '置疑的数据库名', 'single user','false'   
Go