差异增量备份(Differential Incremental Backups )：是指Rman备份上级及同级备份以来所有变化的数据块，差异增量是默认增量备份方式。
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差异备份或称增量备份 Dadabase-differential
下图阐述了差异增量备份的概念。
The diagram below illustrates the concept of differential incremental backup.
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。
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.
差异备份以上一次的增量备份或差异备份为基础。
Delta backups are based on the last incremental or delta backup.
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