OCP-1Z0-053-V12.02-89题

89.You are using recovery Manager (RMAN) with a recovery catalog to backup up your production

database. The backups and the archived redo log files are copied to a tape drive on a daily basis. The

database was open and transactions were recorded in the redo logs. Because of fire in the building you

lost your servers having the production database and the recovery catalog database. The archive log files

generated after the last backup are intact on one of the remote locations. While performing a disaster

recovery of the production database what is the next step that you must perform after restoring the data

files and applying archived redo logs?

A. Open the database in NORMAL mode

B. Open the database in read-only mode

C. Open the database in RESTRICTED mode

D. Open the database with the RESETLOGS option

Answer: D

答案解析：

参考：灾难性恢复：http://blog.csdn.net/rlhua/article/details/12346829

灾难恢复包括在丢失了整个目标数据库、所有当前控制文件、所有联机重做日志文件、所有参数文件和恢复目录数据库（如果有）后还原和恢复目标数据库。

要执行灾难恢复，至少需要以下备份：

• 数据文件的备份

• 在备份之后生成的相应归档重做日志

• 至少一个控制文件自动备份

基本过程：

• 还原服务器参数文件的自动备份。

• 启动目标数据库实例。

• 从自动备份还原控制文件。

• 装载数据库。

• 还原数据文件。

• 恢复数据文件。

• 使用RESETLOGS选项打开数据库。