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)