本文介绍了不同类型的数据库备份方法，重点对比了累积级别1备份、差异级别1备份、完整备份及全备份的区别。累积级别1备份仅包含自上次级别0增量备份以来更改的数据块。
QUESTION 146
Which type of backup contains only the blocks that have changed since the last level 0 incremental backup?
A. a cumulative level 1 backup
B. a differential level 1 backup
C. a full backup
D. a whole backup
Answer: A
同234题：http://blog.youkuaiyun.com/rlhua/article/details/11820583
Explanation/Reference:
Section: Backup, Recovery & Recovery Manager (RMAN)
A cumulative level 1 backup contains only the blocks that have changed since the last level 0 incremental backup.
A full backup contains all used data blocks.
A whole backup contains all used and unused data blocks.
A differential level 1 backup contains only the datablocks that have changed since the last level 1 or level 0 incremental backup.
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