differential incremental backup

基本解释

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 incremental backup backs up all blocks changed after the most recent backup at level n or lower.
差异增量备份用来在级别 n 或更低级别上备份最近备份后更改的所有块。
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 DB2 都提供了增量和差异备份，避免复制未更改的数据页。