1Z0-053章節(jié)練習(2019.11.04)

You are managing an Oracle Database 11g database. You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB. You have tape drives of 300 MB each. To accomplish the backup， you issued the following RMAN command：  
RMAN>BACKUP SECTION SIZE 300M TABLESPACE users；  
What configuration should be effected to accomplish faster and optimized backups by using the above command？（）

Your database has a backup that was taken yesterday （Tuesday） between 13：00 and 15：00 hours. This is the only backup you have. You have lost all the archived redo logs generatedsince the previous Monday， but you have archived redo logs available from the previous Sunday and earlier. You now need to restore your backup due to database loss. 
To which point can you restore your database？（）  

You plan to control idle sessions that are blocking other sessions from performing transactions.
Your requirement is to automatically terminate these blocking sessions when they remain idle for a specified amount of time.
How would you accomplish this task?（）