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When CONFIGURE CONTROLFILE AUTOBACKUP is set to ON， RMAN automatically performs a control file autobackup in which three situations？（）
A:At the end of every RUN block. 
B:After every SET CONTROLFILE AUTOBACKUP FORMAT command. 
C:After every BACKUP or COPY command issued at the RMAN prompt. 
D:At the end of every RUN block if the last command in the block was either BACKUP or COPY. 
E:Whenever a BACKUP or COPY command within a RUN block is followed by a command that is neither BACKUP nor COPY. 
F:After every BACKUP or COPY command within a RUN block that is followed by the CONFIGURE CONTROLFILE AUTOBACKUP FORMAT command.

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出自：Oracle认证

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