You are working on Oracle Database 10g， which is in ARCHIVELOG mode. All the archived log files are intact. 
In which scenario would performing a recovery require the opening of the database with the RESETLOGS option？（）

单项选择题You are using Oracle Database 10g. The LOG_ARCHIVE_FORMAT parameter is set to  ’LOG%t_%s_%r.dbf’.  Why is %r used in the file name format？（）

A.to uniquely identify the archived log files with the restore operation
B.to uniquely identify the archived log files with the redo log group number
C.to uniquely identify the archived log files for each incarnation of the database
D.to uniquely identify the archived log files with the number of recovery operations performed

单项选择题View the Exhibit.  One of the important tables in the USERS tablespace was dropped and purged from the recycle bin at 9：00 a.m. You noticed this at 11：00 a.m. and you want to perform an incomplete recovery to recover the table.  Which statement is true？（）

A.You must recover all data files to the required system change number （SCN）.
B.You must recover all data files， except those that are offline， to the required SCN .
C.You must recover all data files belonging to the USERS tablespace to the required SCN.
D.You cannot recover all data files because segment space management is performed manually for the undo tablespace.

多项选择题Your database operates in ARCHIVELOG mode and all the tablespaces are online. Due to a user error， you decided to perform an incomplete recovery.  Which two tasks would you be required to perform in the recovery process？ （）

A.open the database with the RESETLOGS option
B.open the database with the RESTRICTED option
C.recover all the data files to the same system change number （SCN）
D.recover to the required SCN only that data file in which the error occurred

单项选择题Your database operates in ARCHIVELOG mode. The redo log files are not multiplexed and one of the online redo logs is missing. The missing redo log sequence， 230， is not archived， and it contained information from 10：35 a.m. onwards.  The current time is 11：00 a.m. Because of a disk crash， you executed the following command to perform an incomplete recovery：  RMAN> RUN {  2> SET UNTIL SEQUENCE 230 THREAD 1  3> ALTER DATABASE MOUNT  4> RESTORE DATABASE  5> RECOVER DATABASE  6> ALTER DATABASE OPEN RESETLOGS 7> }  With reference to this scenario， which statement is true？（）

A.RMAN recovers up to log sequence 230， but not including 230.
B.RMAN returns an error because the log sequence number mentioned in the command should be 229.
C.RMAN returns an error because the log sequence number mentioned in the command may never be missing.
D.RMAN recovers up to and including log sequence 229 but then returns an error because log sequence 230 is missing.

多项选择题Foranincompleterecovery，whichfourbackuptypescanbeusedbyRecoveryManager（RMAN）torestoredatafiles？（）

A.RMAN image copies
B.RMAN database backups
C.RMAN tablespace backups
D.user­managed backups placed in the flash recovery area
E.user­managed backups that have been cataloged with RMAN
F.user­managed data file backups for which the full path name is specified