（多选题）
You want to perform an RMAN backup of database as a copy. Which two factors will you consider while performing the backup operation？（）
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
正确答案
答案解析
略
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