单项选择题
A. alter database create block change tracking file
B. alter database enable block change file
C. alter database enable block change tracking using file ，/ora01/opt/ block_change_tracking.fil
D. alter system enable block change tracking using file ’/ora01/opt/block_ change_tracking.fil’
E. alter system block change tracking on
单项选择题 WhichofthefollowingRMANstructurescandatafromadatafilespan？（）
多项选择题 WhichofthefollowingfilescannotbebackedupbyRMAN？（）
单项选择题 Your database has a backup that was taken yesterday （Tuesday） between 13：00 and 15：00 hours. This is the only backup you have. You have lost all the archived redo logs generatedsince the previous Monday， but you have archived redo logs available from the previous Sunday and earlier. You now need to restore your backup due to database loss. To which point can you restore your database？（）