單項選擇題

Which data dictionary views displays the error information related to a data file， when an internal read fails on that file？（）

A.V$DATAFILE
B.V$DATAFILE_HEADER
C.DBA_DATA_FILES
D.V$DBFILE
E.V$DATAFILE_ERRORS

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單項選擇題
After a number of days set by the parameter CONTROL_FILE_RECORD_KEEP_TIME， the information in the control file is overwritten by RMAN. What is this parameter’s default value？（）
A.1 day
B.5 days
C.7 days
D.31 days
單項選擇題
Which of the following steps is incorrect in the following sequence of enabling the ARCHIVELOG mode of a database？（）
A.Shut down the database.
B.Set the appropriate parameters in init.ora file.
C.Start the database in NOMOUNT state.
D.Issue the ALTER DATABASE ARCHIVELOG command.
E.Open the database.
F.Take a full closed backup.