单项选择题
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？（）
单项选择题 WhichofthefollowingstepsisincorrectinthefollowingsequenceofenablingtheARCHIVELOGmodeofadatabase？（）
单项选择题 WhatisthemaximumdatabaseblocksizesupportedfortheOracle9idatabase？（）