Configuring Backup Optimization

Run the CONFIGURE command to enable and disable backup optimization. Backup optimization skips the backup of files in certain circumstances if the identical file or an identical version of the file has already been backed up. Full details on the backup optimization algorithm are provided in "Backup Optimization".

Note that backup optimization applies only to the following commands:

BACKUP DATABASE
BACKUP ARCHIVELOG with ALL or LIKE options
BACKUP BACKUPSET ALL

You can override optimization at any time by specifying the FORCE option on the BACKUP command. For example, you can run:

BACKUP DATABASE FORCE;
BACKUP ARCHIVELOG ALL FORCE;

By default, backup optimization is configured to OFF. To enable backup optimization, run the following command:

CONFIGURE BACKUP OPTIMIZATION ON;

To disable backup optimization, run the following command:

CONFIGURE BACKUP OPTIMIZATION OFF;

To clear the current backup optimization setting, that is, return backup optimization to its default setting of OFF, run this command:

CONFIGURE BACKUP OPTIMIZATION CLEAR;

Displaying Backup Optimization Setting: SHOW BACKUP OPTIMIZATION

You can use SHOW BACKUP OPTIMIZATION to view the current settings of backup optimization as configured with the CONFIGURE BACKUP OPTIMIZATION command. After connecting to the target database and recovery catalog (if you use one), issue the SHOW BACKUP OPTIMIZATION command. For example, enter:

SHOW BACKUP OPTIMIZATION;

Sample output for SHOW BACKUP OPTIMIZATION follows:

RMAN configuration parameters are:
CONFIGURE BACKUP OPTIMIZATION ON;