多选题You lost a data file that belongs to an index tablespace in your database， which operates in ARCHIVELOG mode. Loss of the data file resulted in increased response time on your queries. Which two options would you use to solve this problem？ （）ARestore t

第1题：

Your Certkiller .com database is in ARCHIVELOG mode. The data file that belongs to the SYSTEMtablespacehas become corrupted. Up to what point can you recover the database？（）

• A、Until last commit
• B、Until the time you perform recovery
• C、Until the time the date file got corrupted
• D、Until the point where the last transaction begun
• E、You cannot recover the SYSTEMtablespaceand must re-create the database.

第2题：

Your database is open and running in ARCHIVELOG mode. You take RMAN full backups every Sunday night. On Monday morning， while querying the user1.employees table， you receive the following error message：  01578： ORACLE data block corrupted （file # 5， block # 51） ORA-01110： data file 5：  ’/u01/app/oracle/oradata/orcl/example01.dbf’  You need to rectify the corruption while ensuring the following： The data file should remain online.  The mean time to recover （MTTR） should be minimal.  You are not using a backup control file， and all the archived logs are accessible.   Which option would you choose？（）

• A、flash back the corrupted blocks
• B、use the DBMS_REPAIR package
• C、use the RMAN TSPITR command
• D、use the RMAN BLOCKRECOVER command
• E、use the RESTORE DATABASE and RECOVER DATABASE commands
• F、investigate the time at which the corruption occurred and perform a point-in-time recovery

第3题：

A data file became corrupted in your database due to bad sectors on the disk. Because of corruption， you lost all the important tables in that data file. Which method would you use for recovery？（）

• A、flash back all the tables in the data file， one by one
• B、restore the data file to a new location and perform a media recovery
• C、flash back the database; there is no need to restore the data file
• D、restore the data file from the most recent backup and flash back the database

第4题：

The database is running in NOARCHIVELOG mode. A data file is lost. Which two are valid options for recover？（）

• A、Restore the data file and perform incomplete recovery.
• B、Restore the data file and perform point-in-time recover.
• C、Drop the tablespace and lose all data in the tablespace.
• D、Restore the database and lose all data since the last backup.

第5题：

You work as a database administrator for Certkiller .com. Your database is in NOARCHIVELOG mode. The database has been configured with three redo logs groups， and there have been five log switches. You lost one non-system-critical data file from your database.  Which method would you use to recover the data file？（）

• A、Restore all the data files and open the database
• B、Create the data file and performtablespacerecovery
• C、No need to restore any file， just recover the database
• D、Restore only the system data file and recover the database
• E、Restore only lost date file and performtablespacerecovery

第6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 RESTRICTED option
• B、 open the database with the RESETLOGS option
• C、 recover to the required SCN only that data file in which the error occurred
• D、 recover all the data files to the same system change number （SCN）

第7题：

Your Supportcenter.cn database is in ARCHIVELOG mode. The data file that belongs to the SYSTEM tablespace has become corrupted. Up to what point can you recover the database？（）

• A、Until last commit
• B、Until the time you perform recovery
• C、Until the time the date file got corrupted
• D、Until the point where the last transaction begun
• E、You cannot recover the SYSTEMtablespaceand must re-create the database.

第8题：

You lost a temporary file that belongs to the default temporary tablespace in your database. From the options provided， which approach would you take to solve the problem？ （）

• A、flash back the database
• B、import the temporary tablespace from the last export
• C、restore all the data files and temporary files from the last full database backup and perform a recovery
• D、not perform a recovery， but create a new temporary tablespace， make it the default temporary tablespace and then drop the old tablespace

第9题：

Your database is in NOARCHIVELOG mode. After which two operations you should take the backup of control file？（）

• A、adding a new user to the database
• B、dropping a user from the database
• C、dropping a table from the database
• D、dropping a data file from a tablespace
• E、adding a new tablespace to the database

第10题：

A data file become corrupted in your database due to bad sectors on the disk. Because of corruption， you lost all the important tables in that data file. Which method would you use for recovery？（）

• A、 Flash back all the tables in the data file， one by one.
• B、 Restore the data file to a new location and perform a media recovery.
• C、 Flash back the database， there is no need to restore the data file.
• D、 Restore the data file from the most recent backup and flash the database.