A. With alter database enable block change trackingB. W……

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.

单项选择题You have lost all your online redo logs. As a result， your database has crashed. You have tried to restart the database and clear the online redo log files， but when you try to open the database you get the following error.   SQL> startup ORACLE instance started.  Total System Global Area 167395328 bytes Fixed Size 1298612 bytes Variable Size 142610252 bytes Database Buffers 20971520 bytes Redo Buffers 2514944 bytes Database mounted.  ORA-00313： open failed for members of log group 2 of thread 1 ORA-00312： online log 2 thread 1： ，， oracle01 oradata orcl redo02a.log ORA-27037： unable to obtain file status Linux Error： 2： No such file or directory Additional information： 3  ORA-00312： online log 2 thread 1： ，， oracle01 oradata orcl redo02.log ORA-27037： unable to obtain file status Linux Error： 2： No such file or directory Additional information： 3  SQL> alter database clear logfile group 2； alter database clear logfile group 2 * ERROR at line 1：  ORA-01624： log 2 needed for crash recovery of instance orcl （thread 1） ORA-00312： online log 2 thread 1： ，， oracle01 oradata orcl redo02.log ORA-00312： online log 2 thread 1： ，， oracle01 oradata orcl redo02a.log   What steps must you take to resolve the error？（） a. Issue the recover database redo logs command.  b. Issue the Startup Mount command to mount the database.  c. Restore the last full database backup.  d. Perform a point-in-time recovery， applying all archived redo logs that are available.  e. Restore all archived redo logs generated during and after the last full database backup.  f. Open the database using the alter database open resetlogs command.  g. Issue the alter database open command.

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