本文讨论了在使用RMAN进行数据库备份作为拷贝操作时，需要考虑的两个重要因素。重点是备份是否可以只保存数据库中已使用的和未使用的所有块，以及备份操作是否仅限于实例关闭状态。通过分析，了解了这些关键点对于有效管理和保护数据库的重要性。
QUESTION 3
You want to perform an RMAN backup of database as a copy. Which two factors will you consider while
performing the backup operation? (Choose two).
A. The backup as copy can only be taken to disk
B. The backup as copy can only be taken to tape
C. Backup can be performed only when the instance is shutdown
D. Backup will constitute all used and unused blocks in the database
Answer: AD
同87题：http://blog.youkuaiyun.com/rlhua/article/details/18791979
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