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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

正确答案:B

答案解析:有

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