--恢复镜像 
USE master; 
ALTER DATABASE dnt31 SET PARTNER RESUME 


--切换主备 
USE master; 
ALTER DATABASE BLMS_WX SET PARTNER FAILOVER 


-----------暂停数据库镜像会话 
ALTER DATABASE dnt31 SET PARTNER SUSPEND 

------------------------删除数据库镜像 
ALTER DATABASE dnt31 SET PARTNER OFF