在通过各种数据库配置参数配置了主备数据库并在备用位置恢复了主数据库之后，您就可以启动hadr函数了。
Once you configured the primary and standby databases through various database configuration parameters and restored the primary database at the standby location, you could start HADR function.
最大保护和最大可用性模式需要备重做日志文件配置在配置中的至少一个备数据库上。
The maximum protection and maximum availability modes require that standby redo log files are configured on at least one standby database in the configuration.
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