单项选择题
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
单项选择题 WhichofthefollowingstepsisincorrectinthefollowingsequenceofenablingtheARCHIVELOGmodeofadatabase？（）
单项选择题 WhatisthemaximumdatabaseblocksizesupportedfortheOracle9idatabase？（）
单项选择题 AsADBA，whichofthefollowingmethodscanyouusetomakeabackupofyourtable？（）
