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单项选择题Which is not a valid way of backing up a control file？（）  

A、 Backing up the control file to trace

B、 Copying the existing control file of the database to the backup location during a hot backup 

C、 Copying the existing control file of the database to the backup location during a cold backup

D、 Creating a backup control file

E、 Using the create controlfile command

  • B

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