differential incremental backup

基本解釋

The diagram below illustrates the concept of differential incremental backup.
下圖闡述了差異增量備份的概念。
Differential incremental backup backs up all blocks changed after the most recent backup at level n or lower.
差異增量備份用來在級別 n 或更低級別上備份最近備份后更改的所有塊。
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.
在處理像數(shù)據(jù)倉庫環(huán)境中數(shù)據(jù)庫那樣的巨型數(shù)據(jù)庫方面，Oracle 和 DB2 都提供了增量和差異備份，避免復制未更改的數(shù)據(jù)頁。