归档重做日志（archived redo log）:如果数据库处于费归档模式，联机日志在切换时就会丢弃，而在归档模式下，当发生日志切换时，被切换的日志会进行归档，比如，当前...
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防止出现超越某一时间点前滚的归档重做日志的丢失。
Lost of archived redo logs preventing a roll forward beyond that point.
一旦数据库装载后，数据库就能从主库接收归档重做日志。
Once mounted, the database can receive archived redo data from the primary database.
像通过多路复用(放在不同的位置)控制文件使数据库免疫、使用联机重做日志和归档重做日志这样的步骤，都是避免单点故障所必需的。
Steps such as immunizing ther database by multiplexing (putting in different locations) control files, using online redo logs and archiving redo logs are necessary to avoid a single point of failure.
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