单项选择题

A.Issue ALTER DATABASE BACKUP CONTROLFILE TO filenameB.……

ou are implementing control file multiplexing. Which of the following choices identifies the method you can use in order to generate the control file copies that Oracle will maintain?（）

A.Issue ALTER DATABASE BACKUP CONTROLFILE TO filename
B.Make a copy of the control file with the database shut down
C.Issue ALTER DATABASE BACKUP CONTROLFILE TO trace
D.Make a copy of the control file with the database still running

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单项选择题YouareidentifyingdictionaryobjectsintheOracledatabase.Whichofthefollowingisaviewinthedatadictionary?（）

A.V$DATABASE
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A.SYSTEM
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D.When the database is closed