为了使备用数据库尽可能最新，应该不断地将源数据库上可用的非活动日志文件应用到备用数据库上。
In order to keep the standby database as current as possible, new inactive log files from the source database should be continually applied on the standby database as they become available.
备用数据库上的数据可能根据客户端请求进行了修改。
The data on the standby database might be modified based on client requests.
在启动HADR时，如果主和备用数据库不相同，就会发生错误。
If the primary and standby databases are not identical when HADR is started, an error will occur.
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