Your database operates in ARCHIVELOG mode. User­managed consistent backups are performed every Sunday night. 
On Tuesday， client A drops a table at 8：00 a.m. as follows： 
SQL> DROP TABLE cust_ord PURGE; 
Table dropped. 
Client B executes a query at 9：00 a.m. on the same table as follows： 
SQL> SELECT * FROM cust_ord;
SELECT * FROM cust_ord
* 
ERROR at line 1： 
ORA­00942： table or view does not exist 
Client B needs the dropped table and reports the problem to you. With reference to this scenario， which action should you take？（）

多项选择题You are connected to Recovery Manager （RMAN） without a recovery catalog. There is no copy of the control file available. You want to restore the control file from an autobackup. To retrieve the autobackup，you need the database ID （DBID）.  In which two sources would you find the DBID？ （）

A.the trace file
B.the alert log file
C.an RMAN session log file
D.the server parameter file
E.the formatted name of a control file autobackup

多项选择题You used the following command in Recovery Manager （RMAN） as part of the recovery process： RESTORE CONTROLFILE FROM AUTOBACKUP  How does RMAN find the control file autobackup？（）

A.by using the trace file
B.by using the alert log file
C.by using the database ID
D.by using the server parameter file
E.by using the V$CONTROLFILE view
F.by using the autobackup format configuration setting

多项选择题In your database， all the tablespaces are locally managed. You started Recovery Manager （RMAN） using recovery catalog and restored the control file by using the following command： RMAN> RESTORE CONTROLFILE  Which two operations do you need to perform after restoring the control file from backup？（）

A.shut down and restart the instance
B.add new tempfiles to the temporary tablespaces after recovery
C.perform a media recovery and open the database with the RESETLOGS option
D.perform a media recovery and bring the database to NOARCHIVELOG mode

单项选择题In your database， all the tablespaces are locally managed. You started Recovery Manager （RMAN） using recovery catalog. The following commands are used in the process of recovering the database by using the backup control file：  In what sequence would you use this process to perform the recovery？（）

A.7， 2， 3， 1， 4， 6， 5
B.7， 1， 3， 2， 6， 5， 4
C.2， 1， 7， 6， 3， 5， 4
D.2， 7， 3， 5， 1， 6， 4

单项选择题The loss of the control file forced you to re­create the control file. After re­creating it and opening the database， you find that some of the data files are named as MISSINGnnnnn， where nnnnn is a five­digit number starting with 0.  What could be the possible reason？（）

A.These are the data files that are corrupted.
B.There is no SYSAUX tablespace in your database
C.There is a read­only tablespace in your database.
D.These are the data files that cannot be recovered.