OCP-1Z0-053-200题-99题-10

QUESTION 99

Consider the following scenario for your database:

- Backup optimization is enabled in RMAN.

- The recovery window is set to 7 days in RMAN.

- The most recent backup to disk for the TOOLS tablespace was taken on November 3, 2007.

- The TOOLS tablespace is read-only since November 4, 2007.

On November 23, 2007, you issue the RMAN command to back up the database to disk.

Which statement is true regarding the backup of theTOOLS tablespace?

A. The RMAN backup fails because the TOOLS tablespace is read-only

B. The RMAN skips the backup of the tablespace becausebackup optimization is enabled

C. The RMAN makes backup because optimization can be enabled only for backups to disk

D. The RMAN makes the backup because no backup of thetablespace exists within the seven day window

Answer: D

同10题：http://blog.youkuaiyun.com/rlhua/article/details/12361087

Explanation/Reference:

Section: Backup, Recovery & Recovery Manager (RMAN)

http://web.njit.edu/info/limpid/DOC/backup.102/b14191/rcmconc1008.htm

With a recovery window-based retention policy:

For backups to tape, RMAN takes another backup of a file, even if a backup of an identical file exists,if the

most recent backup is older than the configured recovery window. This is done to allow media to be recycled

after the media expires.

For backups to disk, RMAN skips taking the backup ifan identical file is available from a backup on disk, even

if that backup is older than the beginning of the recovery window. The retention policy causes RMAN to retain

the old backup for as long as it is needed.