多选题To enable faster incremental backups, you enabled block change tracking for the database.Which two statements are true about the block change tracking file? （）(Choose two.)AMultiple change tracking files can be created for a database.BThe change tracki

第1题：

You enabled block change tracking for faster incremental backups in your database. Which background process writes to the change tracking file？（）

• A、 RBAL
• B、 CKPT
• C、 SMON
• D、 PMON
• E、 MMON
• F、 CTWR
• G、 DBWR

第2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3题：

第4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5题：

You issued the following command： ALTER DATABASE ENABLE BLOCK CHANGE TRACKING；  What will be the result of issuing this command？（）

• A、 The block change tracking feature is enabled， and the information about the system change number is written in the change tracking file.
• B、 The block change tracking feature is enabled， and the information about the log sequence number is written in the change tracking file.
• C、 The block change tracking feature is enabled， and the information about the blocks that are changed since the last backup is written in the change tracking file.
• D、 The block change tracking feature is enabled， and the information about the locations of the datafiles and the online redo log files are written in the change tracking file.

第6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7题：

To enable faster incremental backups, you enabled block change tracking for the database.Which two statements are true about the block change tracking file?（）

• A、Multiple change tracking files can be created for a database.
• B、The change tracking file must be created after the first level 0 backup.
• C、RMAN does not support backup and recovery of the change tracking file.
• D、The database clears the change tracking file and starts tracking changes again, after whole database restore and recovery operations.

第8题：

第9题：

Which RMAN backup command is used to create the block-change tracking file？（）  

• A、 alter database create block change tracking file
• B、 alter database enable block change file
• C、 alter database enable block change tracking using file ，/ora01/opt/ block_change_tracking.fil
• D、 alter system enable block change tracking using file ’/ora01/opt/block_ change_tracking.fil’
• E、 alter system block change tracking on

第10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