A. Backup setB. Image copyC. Backup sectionD. Backup gr……

单项选择题Howisblock-changetrackingenabled？（）

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

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.

单项选择题Youhavelostdatafile4fromyourdatabase.Whichistypicallythefastestwaytorestoreyourdatabase？（）

A. Restore and recover the datafile.
B. Restore and recover the tablespace.
C. Restore and recover the database.
D. Restore and recover the control file.
E. Restore and recover the parameter file.

单项选择题WhatdoestheSCNrepresent？（）

A. The system change number， which is a point in time relative to transactions within a given database.
B. A number that represents time. Thus， at 1300 hours， the SCN is the same on all databases. 
C. The security change number， which represents the security code that is needed to access any database structure.
D. A conversion factor that converts internal database time to external clock time.
E. UTC time in the database，providing a standardized way of tracking time in Oracle.