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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

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考题 多选题You have enabled backup optimization for the RMAN environment. Identify two criteria on which RMAN will skip the file， if it has already been backed up.（）AThe data file backup is done with multiple channelsBThe data files is in the read-write mode after being backed up in the read only modeCThe backup was taken after the data files was taken offline-normal or is in the read only modeDThe data file backup complies with the back retention policy and the backup duplexing fe ture
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考题 单选题You work as a database administrator for Certkiller .com. According to your backup strategy， you performed an incremental level 0 backup of your database. Which statement regarding this backup is true？（）A The backup is similar to image copy.B The backup contains all used data blocks.C The backup contains only unused data blocks.D The backup contains all data blocks changed since the last incremental level 1 backup.
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