A customer is backing up a 1 TB Oracle database to an EMC Avamar server. They plan to
reconfigure it to use an incremental strategy. Their goals are to shorten the backup runtime while
maintaining the most simple recovery procedure possible.
What is the recommended configuration?
A.
Configure differential Level-1 backup.
Activate Block Change Tracking.
Increase RMAN channels, periodically schedule a new Level-0.
B.
Configure cumulative Level-1 backup.
Activate Block Change Tracking.
Increase RMAN channels, periodically schedule a new Level-0.
C.
Configure differential Level-1 backup.
Activate Block Change Tracking.
Increase RMAN channels.
D.
Configure cumulative Level-1 backup.
Activate Block Change Tracking.
Increase RMAN channels.
A Level 1 cumulative backs up all data since the most recent Level 0 backup. The amount of changed
data since the most recent Level 0 backup increases with time. This means that the size of a
cumulative backup also increases with time, until another Level 0 backup is taken. Restoring from a
cumulative backup is faster than restoring from a differential backup. However, they will take longer
to complete.
It is recommended to perform Level 0 backups on a regular basis instead of doing Level 1 backups
forever, so that the restore operation from the user perspective is simplified and performed as a
single step. On the backend, the plug-in restores the Level 0 backup first, then the Level 1 backups.
Two schedules should be created; one to perform Level 0 backups and another to perform Level 1
backups. For example, you may have one schedule that performs level 0 backups every Sunday, and
another schedule that performs level 1 backups on all other days.
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