You can use mirrored disks to reduce the time taken for an offline backup with the Oracle database. If mirror disks are used, you can still do online and offline backups in the normal way, but there are additional aspects discussed in this section that you need to be aware of.
The method described here has the disadvantage that the database is not mirrored during the backup. If you must have disk mirroring all the time (for protection against disk failures) this method can be safely deployed if three-way mirroring is used.
You can perform offline backups while the database is online. You have to first shut down the database, then split the disk mirror and then you can restart the database on just one disk set. Next, you usually mount the split-off disk set on another system and perform an offline backup.
The downtime for this method is the time taken to shut down the database, split the mirror, and then restart the database.
If the split-off disk set is mounted on another system – possible for both the approaches outlined above – the backup processing load is removed from the production system, so there is no performance loss during backup.
Use BRBACKUP with mirrored disks
BRBACKUP supports backup for mirrored disks, using the
You have reduced the downtime for an Oracle offline backup or reduced performance loss during an Oracle online backup.