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2018年的时候，OCP 11g考试题库大更新，052 053出现了很多新题，
2019年，11g即将停考的前期，Oracle又出现了一次大变动，12c出现了很多新题，比如062 063题库大更新
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40题、choose three
You perform RMAN backups for your database and use a recovery catalog for managing the backups. To free space, you execute this command:
RMAN> DELETE OBSOLETE;
Which three statements are true in this scenario?
A) The physical files related to the backup are deleted automatically.
B) The backup sets marked as expired are deleted.
C) The physical files related to the backup need to be manually deleted.
D) The information related to the backups is removed from the recovery catalog and the control file.
E) The backups deleted are based on the backup retention policy.
Answer：ADE
(解析：该类似的题目出现多次，delete obsolete删除的是跟冗余策略相关的备份，有关的备份的信息和备份片都会自动更新和删除。)
