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To enable faster incremental backups, you enabled block chan

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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.

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相似问题和答案

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

正确答案:F

第2题：

What purpose would you achieve by enabling the block change tracking feature？（）

  • A、 Eliminate the necessity for backups.
  • B、 Perform optimized image copy backups.
  • C、 Perform optimized incremental backups.
  • D、 Enable checkpoint （CKPT） to perform checkpointing at every block change.
  • E、 Enable database writer （DBWn） to write changed blocks to data files faster.

正确答案:C

第3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 <path>;

C. ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE <path>;

D. ALTER SYSTEM ENABLE BLOCK CHANGE TRACKING;


参考答案：C

第4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

正确答案:D

第5题：

How is block-change tracking enabled？（）  

  • A、 With alter database enable block change tracking
  • B、 With alter system enable block change tracking
  • C、 With an init.ora parameter change
  • D、 With an spfile parameter change

正确答案:A

第6题：

How is block-change tracking enabled?（）

  • A、With alter database enable block change tracking
  • B、With alter system enable block change tracking 
  • C、With an init.ora parameter change 
  • D、With an spfile parameter change 

正确答案:A

第7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.

正确答案:C

第8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.


参考答案：B, C, E

第9题：

What are the two advantages of RMAN Block Media Recovery （BMR） over file/x7flevel recovery？（）

  • A、BMR lowers the mean time to recover （MTTR）.
  • B、BMR supports point­in­time recovery of individual data blocks.
  • C、BMR enables you to use incremental backups for block recovery.
  • D、BMR enables recovery even when the database is not mounted or open.
  • E、BMR enables you to use proxy backups to perform block media recovery.
  • F、BMR enables increased availability of data during recovery because the data file that requires a recovery can remain online.

正确答案:A,F

第10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.

正确答案:C,D

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