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

Which files will you need to perform a full recovery of a database backed up in NOARCHIVELOG mode？（）

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

单项选择题

You have discovered that one of three control files has been lost. What steps would you follow to recover that control file？（）
a. Shut down the database.
b. Restore a control-file copy from backup media.
c. Use the create control file command to create a new control file.
d. Copy the backup control file into place.
e. Create a new copy of the control file from one of the surviving control files.
f. Recover the database using the recover database using backup control file command.
g. Start up the database.

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