单选题You have not configured Oracle Managed Files （OMF） in your database. You do not want to scan the entire datafile every time an incremental backup is performed. You decide to enable the block change tracking feature.  Which statement should you use to e

第1题：

You performed an incremental level 0 backup of a database: RMAN > BACKUP INCREMENTAL LEVEL 0 DATABASE; To enable block change tracking after the incremental level 0 backup, you issued this command: SQL > ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ‘ /mydir/rman_change_track.f’; To perform an incremental level 1 cumulative backup, you issued this command: RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which three statements are true?（）

• A、Backup change tracking will sometimes reduce I/O performed during cumulative incremental backups.
• B、The change tracking file must always be backed up when you perform a full database backup.
• C、Block change tracking will always reduce I/O performed during cumulative incremental backups.
• D、More than one database block may be read by an incremental backup for a change made to a single block.
• E、The incremental level 1 backup that immediately follows the enabling of block change tracking will not read the change tracking file to discover changed blocks.

第2题：

You want to drop the TBS1 tablespace from your database.  You also want to delete the corresponding data files automatically， and not have to do it manually.  What should you do？（）

• A、Use the DROP DATAFILE command.
• B、Use the DROP TABLESPACE command.
• C、Ensure that all database files are Oracle Managed Files before using the DROP TABLESPACE command.
• D、Ensure that the DB_FILE_CREATE_DEST initialization parameter is set before using the DROP TABLESPACE command.

第3题：

You are maintaining your database in Oracle10g. While performing an incremental backup of the database， you want to back uponly those blocks that have changed since the last backup. Which file will you create to increase the performance of the backup operation while performing the incremental backup of the database？（）

• A、 redo log files
• B、 password file
• C、 control file
• D、 change tracking file

第4题：

You are managing an Oracle Database 10g database that uses Oracle Managed Files （OMF）. You enabled the block change tracking feature for the database. Which statement regarding the change tracking file is true？（）

• A、 One block change tracking file is created for each data file. By default， the file is created in DB_CREATE_FILE_DEST.
• B、 One block change tracking file is created for each data file. By default， the file is created in BACKGROUND_DUMP_DEST.
• C、 One block change tracking file is created for the database. By default， the file is created in DB_CREATE_FILE_DEST.
• D、 One block change tracking file is created for the database. By default， the file is created in BACKGROUND_DUMP_DEST.

第5题：

You are managing a database for which incremental backups can be very time consuming. In order to perform optimized incremental backups you enable the block change tracking feature.How would you instruct RMAN to use the block change tracking feature when performing incremental backups？（）

• A、 You need to mention it with every BACKUP command.
• B、 The block change tracking feature is used automatically by RMAN.
• C、 You need to configure it using the CONFIGURE command.
• D、 You need to set the necessary initialization parameters to direct RMAN to use the feature.

第6题：

You are performing flashback of the ORDERS table in the Scott’s schema because some important data is deleted in the table by mistake. The SCN number was 771513 at the time of deletion. You issued the following statement to perform Flashback Table：  SQL> FLASHBACK TABLE ORDERS TO SCN 771513；   What is the prerequisite to perform Flashback Table？（）

• A、 You must configure OMF in your database.
• B、 You must enable block change tracking feature in your database.
• C、 You must enable ROW MOVEMENT feature on the ORDERS table.
• D、 You must use the Flashback Version Query before using the Flashback Table feature.

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第13题：

You have not configured Oracle Managed Files （OMF） in your database. You do not want to scan the entire datafile every time an incremental backup is performed. You decide to enable the block change tracking feature. Which statement will you use to enable the block change tracking feature？（）

• A、 ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING；
• B、 ALTER DATABASE ENABLE BLOCK CHANGE TRACKING；
• C、 ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING USING FILE ；
• D、 ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ；

第14题：

Examine the following command used to perform incremental level 0 backup：   RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE；   To enable the block change tracking， after the incremental level 0 backup you issued the following command：   SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ’/mydir/ rman_change_track.f’；To perform incremental level 1 cumulative backup， you issued the following command：   RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE；   Which two statements are true in the above situation？（）

• A、 The block change tracking data will be used only from the next incremental 0 backup.
• B、 The incremental backup will use change tracking data for accomplishing the backup.
• C、 The incremental backup will not use change tracking data for accomplishing the backup.
• D、 The block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.

第15题：

You have configured OMF in your database. You enabled the ALTER DATABASE ENABLE BLOCK CHANGE TRACKING； statement to enable the block change tracking feature.  What information will be written in the change tracking file？（）

• A、 the system change number
• B、 the locations of the redo log files
• C、 the locations of the datafiles
• D、 the physical location of all the database changes

第16题：

You enable block change tracking. You issue the following command: BACKUP INCREMENTAL LEVEL 0 DATABASE; The next day, you issue the following command: BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE; Which statement about the use of the change tracking file is true?（）

• A、RMAN reads the block change tracking file only when it performs the incremental level 0 backup.
• B、RMAN reads the block change tracking file when it performs both incremental backups.
• C、RMAN reads the block change tracking file only when it performs the incremental level 1 backup.
• D、RMAN does not read the block change tracking file when it performs either incremental backup.

第17题：

You have not configured Oracle Managed Files (OMF) in your database. You do not want to scan the entire datafile every time an incremental backup is performed. You decide to enable the block change tracking feature.Which statement should you use to enable the block change tracking feature?（）

• A、ALTER DATABASE ENABLE BLOCK CHANGE TRACKING
• B、ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING USING FILE
• C、ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE
• D、ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING

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