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.（）
发布日期：2022-06-30
A
The data file backup is done with multiple channels
B
The data files is in the read-write mode after being backed up in the read only mode
C
The backup was taken after the data files was taken offline-normal or is in the read only mode
D
The data file backup complies with the back retention policy and the backup duplexing feature
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