Managing archived redo logs 管理一个归档日志
Lost of archived redo logs preventing a roll forward beyond that point.
防止出现超越某一时间点前滚的归档重做日志的丢失。
You can keep a standby database current with its original database by continuously applying the original archived redo logs to the standby database.
可以弄一个和源数据库一样的备份数据库，通过源数据库生成的归档日志文件，把源数据库里的数据同步到备份数据库中。
Lost of online redo logs before they are archived.
在对联机重做日志进行归档之前，这些日志丢失了。
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