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You are using RMAN to backup your ARCHIVELOG mode database. You have enabled control-file
autobackups. Which files are not backed up during the RMAN backup?
A. Database Datafiles
B. Database Control Files
C. Online redo logs
D. Archived redo logs
E. The database SPFILE
F. None of the above, all these files are backed up.

　　The online redo logs are never backed up by Oracle no mater what kind of backup you are performing.
注:ARCHIVELOG mode时，rman backup中会发出alter system switch logfile 的命令，并备份archivelog ,等同于备份了online redo 而noARCHIVELOG mode时，不能online backup,所以，redo log是没有用的.另外，如果你备份online redo log，并在恢复时使用，覆盖现有的online redo log，可能会引起数据丢失