If you use separate databases for the instance and its applications , make sure that each database uses the same log shipping schedule so that the standby databases are updated at the same time 如果对实例及其应用程序分别使用单独的数据库，请确保每个数据库使用同一个日志传送调度，以便同时更新备用数据库。
This new scheme can detect the malfunction of database system and superintend the operation system connecting to standby database when the host database is paralyzed . the entire switch time can be controlled in several minutes . after the host database restoring , all operations on standby database should be recurred on host database 自动切换功能可以在主用数据库发生异常时自动切换到备用数据库继续工作,使数据库故障对设备乃至网络的影响时间控制在几分钟以内,主用数据库恢复以后,在备用数据库上进行的操作应该能恢复到主用数据库上。
