Oracle OCP认证考试题库解析052-4

QUESTION 4

In which of the scenario will the DBA perform recovery? (Choose all that apply.)
A. The alert log file is corrupted
B. A tablespace is accidentally dropped
C. One of the redo log members is corrupted
D. A database user terminates the session abnormally
E. The hard disk on which the data files is stored is corrupted

Correct Answer: BE

Explanation/Reference: DBA一般在数据库出现介质损坏的时候执行恢复操作. A: 错误,alert日志损坏数据库不会丢失数据,不需要恢复. B: 正确,表空间在操作系统改名需要执行恢复,数据库找不到表空间对应的数据文件.C: 错误,丢失redo成员,不会丢失数据,不需要执行恢复操作.D: 错误,会话异常终止不会丢失数据,不需要恢复,数据库会释放异常会话占用的资源.E: 正确,磁盘损坏会导致在该磁盘的数据文件损坏,需要执行恢复操作.

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