YouaremanaginganOracleDatabase11gdatabasewiththefollowingbackupstrategy：1.OnSunday，anincrementallevel0tapebackupisperformed.2.MondaythroughSaturday，acumulativeincrementallevel1tapebackupisperformed.Whichtwostatementsaretrueregardingthebackupsperformed（）A.
题目
YouaremanaginganOracleDatabase11gdatabasewiththefollowingbackupstrategy：1.OnSunday，anincrementallevel0tapebackupisperformed.2.MondaythroughSaturday，acumulativeincrementallevel1tapebackupisperformed.Whichtwostatementsaretrueregardingthebackupsperformed（）
A.Thebackupperformedinstep1backsupallblocksthathaveeverbeeninuseinthedatabase.
B.Thebackupperformedinstep2copiesalltheblockschangedsincethemostrecentlevel0backup.
C.Thebackupperformedinstep1backsupalltheblockschangedsincethemostrecentlevel1backup.
D.Thebackupperformedinstep2backsupallblocksthathavechangedsincethemostrecentincrementalbackupatlevel1.
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参考答案和解析
参考答案：A, B