For an incomplete recovery， which four backup types can be used by Recovery Manager （RMAN） to restore data files？ （）

单项选择题Consider the recovery steps in each of the cases given below：  Case 1：  Shut down the database and perform a backup.  Restore all the data files.  Mount the database.  Recover the database.  Without applying all the redo log files， open the database using the RESETLOGS option.  Back up the database.  Case 2：  Shut down the database and perform a backup.  Restore only the data files of the tablespace where user error damaged the data.  Mount the database.  Recover the database.  Open the database with the RESETLOGS option.  Back up the database.  Case 3： Shut down the database  Restore the data files  Open the database  Perform recovery to the current point in time.  Which case has the correct steps for an incomplete recovery？（）

A.only case 1
B.only case 2
C.only case 3
D.case 1 and 2
E.case 2 and 3
F.case 1 and 3
G.all cases： case 1， case 2 and case 3

单项选择题You performed an incomplete recovery on your Oracle Database 10g database using the following command：  SQL> RECOVER DATABASE  2 UNTIL TIME ’2004­08­05：12：10：03’  3 USING BACKUP CONTROLFILE  In which situation would the above recovery be required？（）

A.A user table was lost at the specified time.
B.A redo log file was lost at the specified time.
C.The backup control file is on a faster disk than the current one.
D.The current control file has a different path compared with the intended time of recovery.
E.The current control file does not match the physical structure of the database at the intended time of recovery.

单项选择题The current time is 12：00 noon. You want to recover the USERS tablespace from a failure that occurred at 11：50 a.m. You discover that the only member of an unarchived redo log group containing information from 11：40 a.m. onwards is corrupt.  With reference to this scenario， if you are not using Recovery Manager （RMAN）， which recovery method would you use？（）

A.time­based recovery
B.log sequence recovery
C.cancel­based recovery
D.change­based recovery

多项选择题YourdatabaseisfunctioninginARCHIVELOGmode.Inwhichtwosituationswouldyouperformacancel­basedrecovery？（）

A.You find that one of the redo log members in each redo log group is lost.
B.You find that a data file that belongs to the USERS tablespace is damaged.
C.You find that a data file that belongs to the SYSTEM tablespace is damaged.
D.You find that the current redo log group is damaged and is not available for recovery.
E.You realized while performing a recovery that an archived redo log file needed for recovery is lost.

单项选择题You have only two redo log groups and these groups get overwritten several times in a day. Your database operates in NOARCHIVELOG mode and user­managed consistent backups are performed every Sunday night. On Thursday morning， you find that an important table has been dropped and purged.  With reference to this scenario， up to what point in time can the data be recovered？（）

A.until Thursday morning
B.until last Sunday’s backup
C.until Wednesday evening
D.until that point in time when the database is opened
E.until that point in time when the recovery is performed
F.until that point in time when the table is dropped and purged