Home » Oracle » 1z0-070 » Which two statements are true about backup performance when using Recovery Manager (RMAN) on an X5 Database Machine?
Which two statements are true about backup performance when using Recovery Manager (RMAN) on an X5 Database Machine?
A. Backups are fast because the Infiniband network is faster than fiber channel storage, so RMAN read I/O operations are faster than in traditional storage networks.
B. Backups are fast, because physical I/Os operations are reduced by the use of the Storage Index by cellsrv.
C. Backups are fast, because data blocks are read from the Database Flash Cache.
D. Backups are fast, because all data blocks are read from the Exadata Smart Flash Cache.
E. For incremental backups using Block Change Tracking, cellsrv filters blocks and returns only those that have changed since the last backup.
Correct Answer: DE
Explanation/Reference:
D: The storage server software manages the flash cache and can recognize different types of I/O requests so that non-repeatable data access like RMAN backup
I/O does not flush database blocks from the cache. It also prioritizes frequently accessed block types such as redo logs, control files, and index root blocks.
E: RMAN block change tracking allows incremental backups to run very quickly and efficiently. With block change tracking, only the areas of the database that have been modified since the last incremental backup or full backup are read from disk.
Incorrect Answers:
C: Database Flash Cache is separate from Exadata Smart Flash Cache. The Database Smart Flash Cache feature and increase the buffercache of your database from like 100G or 200G to 300-700G on that same server.
References: https://logicalread.com/using-oracle-exadata-flash-cache-mc05/#.Wd80zmiCyUk http://www.oracle.com/technetwork/database/availability/maa-techwp- sundbm-backup-11202-183503.pdf
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