You issue the following command:
RMAN>CONFIGURE BACKUP OPTIMIZATION ON;
What is the result of this command on your backups?
A.
An incremental backup strategy will be used automatically.
B.
Read-only datafiles will not be backed up as long as backups of those files already exist
and those backups meet established retention criteria.
C.
RMAN will configure itself for maximum performance at the cost of CPU.
D.
RMAN will configure itself for minimal OS/CPU impact at the cost of time to back up the
database.
E.
RMAN will automatically compress backups.
B is correct:
Backup Optimization for SBT Backups With Redundancy Retention Policy
Assume that you configure a retention policy for redundancy. In this case, RMAN only skips backups of offline or read-only datafiles to SBT when there are r + 1 backups of the files, where r is set in CONFIGURE RETENTION POLICY TO REDUNDANCY r.
For example, assume that you enable backup optimization and set the following retention policy:
CONFIGURE DEFAULT DEVICE TYPE TO sbt;
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE RETENTION POLICY TO REDUNDANCY 2;
With these settings, RMAN only skips backups when three identical files are already backed up. Also assume that you have never backed up the users tablespace, which is read/write, and that you perform the actions described in Table 5-5 over the course of the week.