32、choose three
Backup requirements for a database:
-
Level 0 backup on Sunday
-
Cumulative incremental level 1 backup on Monday, Wednesday, and Saturday
- Differential incremental level 1 backup on Tuesday, Thursday, and Friday
Which three statements are true about the strategy?
A) Level 1 backup on Tuesday, Thursday, and Friday contains all the blocks that have been changed since the last level 0 backup.
B) Level 1 backup on Tuesday, Thursday, and Friday contains all the blocks that have been changed since the last level 1 backup.
C) Level 0 backup on Sunday contains all the blocks that have been formatted.
D) Level 0 backup on Sunday contains all the blocks that have been changed since the last level 1 backup.
E) Level 1 backup on Monday, Wednesday, and Saturday contains all the blocks that have been changed since the last level 0 backup.
Answer：BCE
(解析：答案B是差異增量備份，備份的是自從上一次同一級或者更低一級的改變的數據塊;0級備份類似於full備份，備份的是所有的有數據的數據塊;累積增量備份備份的自從上一次更低一級的以來的改變的塊，所以E答案是對的。來自3組：1015267481)