单项选择题
Which of the following best describes a full backup? （）
A.All datafiles of a database B.All datafiles, archive logs, and control files C.All datafiles and control files D.All the used blocks in a datafile
单项选择题 Howisblock-changetrackingenabled?（）
单项选择题 Youhavelostdatafile4fromyourdatabase.Whichistypicallythefastestwaytorestoreyourdatabase?（）
单项选择题 WhatdoestheSCNrepresent?（）
