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Archive file format LOG_ARCHIVE_FORMAT is defined as arch_%s.arc. A week ago， you just archived arch_4.arch to tape， then removed all archived files to save disk space. Yesterday you saw arch_10.arc and arch_11.arc on the disk. Today， you see arch_3.arc in the archive directory.  Which two could you happened？（）
A:Redo logs were restored from tape for recovery. 
B:The file names are only used when they are copied to tape. 
C:The database was opened with the RESETLOGS option and log numbers restarted. 
D:Log names run in circular fashion; arch_3.arc is re-created by the ARCn process. 
E:A file name is randomly chosen by the archive process; as long as it is unique, it does not have to be sequential.

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出自：Oracle认证

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