If you find errors in the view V$DATABASE_BLOCK_CORRUPTION with a status of MEDIA_CORRUPT， what RMAN command would you run to correct the problem？（）

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

单项选择题What happens if you shutdown abort ASM instance?（）

A. The RDBMSs connected will shutdown abort too
B. CLUSTER SERVICE will shutdown
C. ASM wil do instance recovery after startup

单项选择题While tuning a SQL statement, the SQL Tuning Advisor finds an existing SQL profile for the statement that has stale statistics available. What would the optimizer do in this situation?（）

A. It updates the existing SQL profiles with current statistics.
B. It makes the statistics information available to GATHER_STATS_JOB
C. It initiates the statistics collection process by running GATHER_STATS_JOB
D. It logs a warning message in the alert log so that the DBA can perform statistics collection manually.