多项选择题
What two are the prerequisites for enabling Flashback Database？（）
A. The database must be in ARCHIVELOG mode
B. The database must be in MOUNT EXCLUSIVE mode
C. The database must be opened in RESTRICTED mode
D. The database instance must be started in the NOMOUNT state
E. The database instance must have the keep buffer pool defined
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Whichtypeofbackupmustbeperformedfirstwithanincrementalbackup？（）
A. Level 1
B. Level 0
C. Level 2
D. Level 3 -
单项选择题
Whichtypeofbackupbacksuponlydatablocksmodifiedsincethemostrecentbackupatthesamelevelorlower？（）
A. Differential incremental backup
B. Different incremental backup
C. Cumulative backup
D. Cumulative incremental backup -
单项选择题
Whichisthecorrectcommandtobackupthedatabase，backupthearchivedredologs，andthenremovethebacked-uparchivedredologs？（）
A. backup database
B. backup database and archivelogs
C. backup database plus archivelogs
D. backup database plus archivelog delete input
E. backup database and archivelog delete input
