Which of the following represents the correct way to perform an online recovery of datafile 4， which is assigned to a tablespace called USERS？（）  

单项选择题What will be the end result of this set of RMAN commands？（）   shutdown abort startup mount  restore datafile 4 until time ，，09 30 2008：15：00：00；  recover datafile 4 until time ，，09 29 2008：15：00：00；  alter database open resetlogs；

A. Datafile 4 will be recovered until 9/30/2008 at 15：00 and the database will open.
B. The restore command will fail.
C. The recover command will fail.
D. The alter database open resetlogs command will fail.
E. All these commands will fail because they must be in the confines of a run block.

单项选择题IfyoufinderrorsintheviewV$DATABASE_BLOCK_CORRUPTIONwithastatusofMEDIA_CORRUPT，whatRMANcommandwouldyouruntocorrecttheproblem？（）

A. recover lost blocks
B. recover corrupt blocks
C. recover media corrupt blocks from list
D. recover corrupt blocks from list
E. recover corruption list

多项选择题You have a database with the following tablespaces： SYSTEM， SYSAUX， UNDO， USERS， TEMP. You want to roll back  the data in the USERS tablespace to the way it looked yesterday.  Which tablespaces do you need to perform a point-in-time restore operation on in order to complete this task？（）

A. SYSTEM
B. SYSAUX
C. UNDO
D. USERS
E. TEMP
F. This restore is not possible

单项选择题Whichofthefollowingdoestherecovercommandnotdo？（）

A. Restore archived redo logs.
B. Apply archived redo logs.
C. Restore incremental backups.
D. Apply incremental backups.
E. Restore datafile images.

多项选择题Whichofthefollowingarevaliduntilcommandoptionswhenattemptingpoint-in-timerecoveryinRMAN？（）

A. until time
B. until change
C. until sequence
D. until SCN
E. until commit