Which of the following commands cannot be executed when the database open？（）

单项选择题Whichofthefollowingviewsmustyouquerytoidentifyanycorruptdatafileblocksthathavebeendetectedduringbackupsetcreation？（）

A.V$COPY_CORRUPT
B.V$COPY_CORRUPTION
C.V$BACKUP_CORRUPT
D.V$BACKUP_CORRUPTION

单项选择题Whichdatadictionaryviewsdisplaystheerrorinformationrelatedtoadatafile，whenaninternalreadfailsonthatfile？（）

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

单项选择题AfteranumberofdayssetbytheparameterCONTROL_FILE_RECORD_KEEP_TIME，theinformationinthecontrolfileisoverwrittenbyRMAN.Whatisthisparameter’sdefaultvalue？（）

A.1 day
B.5 days
C.7 days
D.31 days

单项选择题WhichofthefollowingstepsisincorrectinthefollowingsequenceofenablingtheARCHIVELOGmodeofadatabase？（）

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.

单项选择题WhatisthemaximumdatabaseblocksizesupportedfortheOracle9idatabase？（）

A.16KB
B.32KB
C.64KB
D.128KB