（319）What is the end result of these commands if they are successful?

RMAN> show retention policy;

RMAN configuration parameters for database with db_unique_name ORCL are:

CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default

Backup database tag=gold_copy plus archivelog tag=gold_copy delete input;

Backup database tag=silver_copy plus archivelog tag=silver_copy delete input;

A. Attempting to restore silver_copy will fail.

B. Attempting to restore gold_copy will fail.

C. Both backups will be available for restore without question.

D. Attempting to restore gold_copy may or may not succeed.

E. You will not be able to restore either gold_copy or silver_copy.

答案：（D）

解析：

因为配置的保留策略为REDUNDANCY 1，故这里有两个备份，其中第一次备份的即gold_copy就会显示为obsolete

obsolete状态的备份机在用来恢复时，可能成功，可能不成功。