单项选择题

How is block-change tracking enabled？（）

A. With alter database enable block change tracking
B. With alter system enable block change tracking
C. With an init.ora parameter change
D. With an spfile parameter change

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多项选择题

During recovery， you need to know if log sequence 11 is in the online redo logs， and if so， you need to know the names of the online redo logs so you can apply them during recovery. Which view or views would you use to determine this information？（）

A. V$LOGFILE
B. V$RECOVER_LOG
C. V$RECOVER_DATABASE
D. V$LOG_RECOVER
E. V$LOG

多项选择题

You are trying to recover your database. During the recovery process， you receive the following error： ORA-00279： change 5033391 generated at 08 17 2008 06：37：40 needed for thread 1ORA-00289： suggestion ： oracle01 flash_recovery_area ORCL archivelog 2008_08_17 o1_mf_1_11_%u_.arc ORA-00280： change 5033391 for thread 1 is in sequence #11 ORA-00278： log file ，， oracle01 flash_recovery_area ORCL archivelog 2008_08_17 o1_mf_1_10_4bj6wnqm_.arc no longer needed for this recovery Specify log： {=suggested | filename | AUTO | CANCEL} ORA-00308： cannot open archived log ，， oracle01 flash_recovery_area ORCL archivelog 2008_08_17 o1_mf_1_11_%u_.arc ORA-27037： unable to obtain file status Linux Error： 2： No such file or directory Additional information： 3 How do you respond to this error？（）

A. Restore the archived redo log that is missing and attempt recovery again.
B. Recovery is complete and you can open the database.
C. Recovery needs redo that is not available in any archived redo log. Attempt to apply an online redo log if available.
D. Recover the entire database and apply all archived redo logs again.
E. Recovery is not possible because an archived redo log has been lost.