多项选择题

What methods of point-in-time recovery are available？（）

A. Change-based
B. Cancel-based
C. Time-based
D. Sequence number-based
E. Transaction number-based

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单项选择题

Which are the correct steps， in order， to deal with the loss of an online redo log if the database has not yet crashed？（） a. Issue a checkpoint. b. Shut down the database. c. Issue an alter database open command to open the database. d. Startup mount the database. e. Issue an alter database clear logfile command. f. Recover all database datafiles.

A.a， b， c， d
B.b， d， e， c
C.a， b， d， e， c
D.b， f， d， f， c
E.b， d， a， c

多项选择题

WhichfileswillyouneedtoperformafullrecoveryofadatabasebackedupinNOARCHIVELOGmode？（）

A. Database datafiles
B. Control files
C. Archived redo logs
D. Online redo logs
E. Flashback logs

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