单项选择题
YouissuedthefollowingRMANcommand：RMAN>CONFIGURECONTROLFILEAUTOBACKUPON；WhatisNOTanimpactofusingtheabovecommand？（）
A.WhenasuccessfulbackupisrecordedintheRMANrepository，thenabackupofthecurrentcontrolfileisperformed.
B.Whenastructuralchangeismadetothedatabase，thenabackupofthecurrentcontrolfileisperformed.
C.WhenasuccessfulbackupisperformedintheRMANrepository，thenabackupofthespfileisperformed.
D.Whenastructuralchangeismadetothedatabase，thenabackupofthealertlogfilewillbeperformed.