多选题You perform differential incremental level 1 backups of your database on each working day and level 0 backup on Sundays， to tape. Which two statements are true about differential incremental backups（）AThe backup performed on Sundays contains all the b
题目
多选题
You perform differential incremental level 1 backups of your database on each working day and level 0 backup on Sundays， to tape. Which two statements are true about differential incremental backups（）
A
The backup performed on Sundays contains all the blocks that have ever been used in the database.
B
The backup performed on Sundays contains all the blocks that have changed since the last level 1backup.
C
The backup performed on each working day contains all the blocks that have changed since the lastlevel 0 backup.
D
The backup performed on Monday contains all the blocks that have changed since the level 0 backup，and every other working day contains all the blocks that have changed since the level 1 backup.
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参考答案和解析
正确答案：
A,D
解析：
暂无解析