differential_incremental_backup

1.The diagram below illustrates the concept of differential incremental backup.
下图阐述了差异增量备份的概念。
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2.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。
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