A DBA takes a full backup of the PRODUCTS database every Sunday.  During the week, two other backups are taken, one on Tuesday and one on Thursday.  The weekly backup images are retained for two months.   The PRODUCTS database is about 800 GB, and minimal updates to the database occur during the week.  Assuming that storage costs are the primary concern, which of the following commands would produce the smallest image for Thursday's backup?
A.
BACKUP DATABASE PRODUCTS TO /fs1/products/backup COMPRESS        
B.
BACKUP DATABASE PRODUCTS INCREMENTAL TO /fs1/products/backup        
C.
BACKUP DATABASE PRODUCTS TO /fs1/products/backup EXCLUDE LOGS        
D.
BACKUP DATABASE PRODUCTS INCREMENTAL DELTA TO /fs1/products/backup

我选D

没人继续答题？

我选D

DDDDDDDDDDDDDD

大家不妨试验一下

从我做项目的角度来说，我会选择b

先给个理论上的理由吧。

如果不是d，就只能是b了。既然搂主这么说，b的可能性比较大

是否因为minimal update，所以delta的overhead反而比数据变化本身更大？谁知道不同backup image的组成？

开始我也认为是D，但测试结果……
我这里没有大的数据库，用sample测试的结果，却是A 。

有哪位有大的测试下？