Oracle试题:032的144题
添加时间: 2008-4-18 22:21:00 作者: Oracle题库 阅读次数:171 来源: http://www.d9soft.com
QUESTION NO: 144
After running the CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS command, what has been accomplished?
A. Retain the data file backup for 7 days.
B. Run the recover process every 7 days.
C. Destroy the physical backup files every 7 days.
D. Destroy the physical backup files older than 7 days.
E. Retain one backup of each data file for at least 7 days.
F. Keep the catalog information in the control file for 7 days.
答案是 E，
请问A，E 有什么区别吗？
解答:
如果在 7 天內還沒有新的備份，那麼即使舊的備份已超過 7 天，但仍然還是要保留的。這就是 A 與 E 的不同之處。
答案是E
A是說 db 的datafile
E是說 backup set 的datafile
RETENTION POLICY 是定義backup保存的時間 所以答案是E
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