单项选择题

What is the proper procedure to recover a lost tempfile？（）

A. Restore the backup copy of the tempfile from the backup media.
B. Re-create the tempfile with the create tempfile command.
C. Copy an existing tempfile from another database.
D. Re-create the tempfile with the create tablespace command.
E. Re-create the tempfile with the alter tablespace command.

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多项选择题

Which files are required for a full recovery of the database in ARCHIVELOG mode？（）

A. Database datafiles
B. Online redo logs
C. Archived redo logs
D. Backup control file
E. Control file from a backup

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

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