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唸。
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(jí)別 n 或更低級(jí)別上備份最近備份後更改的所有塊。
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.
在処理像數(shù)據(jù)倉庫環(huán)境中數(shù)據(jù)庫那樣的巨型數(shù)據(jù)庫方麪，Oracle 和 DB2 都提供了增量和差異備份，避免複制未更改的數(shù)據(jù)頁。