You can think of this as a kind of differential backup!
你能想到这是一个种差异备份！
A full database backup is required before a differential backup can be performed.
需要执行完整备份后，才能执行差异备份。
Differential backup — Backs up all of the modified pages in a database after the last successful full backup is completed.
差异化备份——只对上次完全备份之后有过更改的页面进行备份。
Dealing with huge databases such as those in data warehouse environment, both Oracle and DB2 provide incremental and differential backup to avoid copying unchanged data pages.
在处理像数据仓库环境中数据库那样的巨型数据库方面，Oracle和DB 2都提供了增量和差异备份，避免复制未更改的数据页。
The diagram below illustrates the concept of differential incremental backup.
下图阐述了差异增量备份的概念。
Differential partial backup — This backup only records data that has changed in the filegroups since the preceding partial backup.
差异化部分备份——差异化部分备份仅记录自上一次部分备份以来文件组中发生更改的数据区。
This let you supplement a partial backup with a short series of differential partial backups.
这样，您可以通过为数不多的几个部分差异备份来补充部分备份。
A differential partial backup is based on a partial backup.
部分差异备份，基于部分备份。
A differential partial backup is based on a partial backup.
部分差异备份，基于部分备份。
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