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。
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。
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。
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