Block Media recovery, BMR

OCP 053:

399. Which of the following is not an advantage of Block Media recovery (BMR )?

A. Reduced MTTR.

B. datafiles remain offline while loading upt blocks are retried red.

C. datafiles remain online while uploading upt blocks are retried red.

D. A and C

Answer: B

Answer:

According

 

• Lowers the mean time to recover (MTTR) because only blocks needing recovery are restored and recovered

• Enables affected data files to remain online during recovery

B is not unique to Block Media recovery (BMR.

 

 

Block Media recovery

The recovery of specified blocks within a data file with the recovery ManagerRECOVER ... BLOCKCommand. Block Media recovery leaves the affected data files online and restores and recovers only the damaged or upted blocks.

Purpose of Block Media recovery

You can use Block Media recovery to recover one or more than upt data blocks within a data file. Block Media Recovery provides the following advantages over data file media recovery:

• Lowers the mean time to recover (MTTR) because only blocks needing recovery are restored and recovered

• Enables affected data files to remain online during recovery

  Without Block Media recovery, if even a single block is too upt, then you must take the data file offline and restore a backup of the data file. you must apply all redo generated for the data file after the backup was created. the entire file is unavailable until media recovery completes. with Block Media recovery, only the blocks actually being recovered are unavailable during the recovery.

Block Media recovery is most useful for physical authentication uption problems that involve a small, well-known number of blocks. block-level data loss usually results from intermittent, random I/O errors that do not cause widespread data loss, and memory before uptions that are written to disk. block Media recovery is not intended for cases where the extent of data loss or partition uption is unknown and the entire data file requires recovery. in such cases, data file media recovery is the best solution.