Oracle OCP IZ0-053 Q319(Rman Retention)

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.
Answer: D

http://blog.csdn.net/rlhua/article/details/17025459

因為配置的保留策略為REDUNDANCY 1，故這裡有兩個備份，其中第一次備份的即gold_copy就會顯示為obsolete。

obsolete狀態的備份機在用來恢復時，可能成功，可能不成功。

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