单项选择题
A.The data files can be recovered till the last committed transaction.
B.The data files can be recovered without shutting down the database.
C.The data file is taken offline automatically; the database remains open.
D.The data files can be recovered to the time of the most recent backup.
多项选择题 Inyourdatabase，theLogWriter（LGWR）processisunabletowritetoamemberofacurrentredologgroupduetoread/writefailure.Whichtwoeffectswouldyouseeinyourdatabase？（）
多项选择题 Your database is configured in NOARCHIVELOG mode. All the control files have been lost due to a hard disk failure but the data files are not lost. You have the closed whole database backup available to you. Which two statements are true in this scenario？（）
单项选择题 Accordingtoyourbackupstrategy，youperformedanincrementallevel0backupofyourdatabase.Whichstatementregardingthisbackupistrue？（）