ocp認證052考題解析：1Z0-V8.02-第67題，完整題庫請點擊這里聯(lián)系老師咨詢了解

67. The instance abnormally terminates because of a power outage. Which statement is true about redo log files during instance recovery?

A.Inactive and current redo log files are required to accomplish recovery.

B.Online and archived redo log files are required to accomplish instance recovery.

C.All redo log entries after the last checkpoint are applied from redo log files to data files.

D.All redo log entries recorded in the current redo log file until the checkpoint position are applied to data files.

Answer: C

答案解析：

這個是屬于實例恢復，實例恢復不需要DBA的干預。

Oracle DB 會自動從實例故障中進行恢復。實例所需要做的就是正常啟動。如果Oracle Restart 已啟用并且配置為監(jiān)視該數(shù)據(jù)庫，則該啟動操作會自動進行。實例會裝載控制文件，然后嘗試打開數(shù)據(jù)文件。如果實例發(fā)現(xiàn)數(shù)據(jù)文件在關閉期間尚未同步，則會使用重做日志組中包含的信息將數(shù)據(jù)文件前滾到關閉時的狀態(tài)，此時利用的重做日志信息即是自最后一次檢查點以來所有的重做信息。然后，將打開數(shù)據(jù)庫，并回退所有未提交的事務處理。