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是差异增量备份，备份的是自从上一次同一级或者更低一级的改变的数据块;0级备份类似于full备份，备份的是所有的有数据的数据块;累积增量备份备份的自从上一次更低一级的以来的改变的块，所以E答案是对的。来自3组：1015267481)