OCP-1Z0-053-V12.02-272题

272.You issue the following RMAN command to set a retention policy on a database:

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RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2;

What will be the outcome of issuing this command?

A. After two days, a backup will be marked obsolete

B. After two days, a backup will be deleted from the media

C. If the RMAN repository has records of two or more recent backups of a file, then older backups will be

deleted from the media.

D. If the RMAN repository has records of two or more recent backups of a file, then older backups will be

marked obsolete.

Answer: D

答案解析：

Configuring a Redundancy-Based Retention Policy

The REDUNDANCY parameter of the CONFIGURE RETENTION POLICY command specifies how many full or level 0 backups of each data file and control file that RMAN should keep. If the number of full or level 0 backups for a specific data file or control file exceeds the REDUNDANCY setting, then RMAN considers the extra backups as obsolete. The default retention policy is REDUNDANCY 1.

官方参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmconfb.htm#i1019345