1.Put the database into a consistent mode that permits a snapshot to be taken.
2.Perform a snapshot of the application data.
3.Return the database to normal operating mode.
This configuration enables an offline backup of a very large database in a short time, as well as an online backup that creates very few archive log files, since the backup mode time of the database is kept to a minimum.
The small number of archive logs reduces the space needed for the archive logs in total, as well as speeding up the recovery process of the database. After a restore of an online database, a recovery is needed to return the database to a consistent state. All archive logs that have been created during the backup must be applied. In a snapshot backup, only the archive log files created during the snapshot are applied.
Other supported configurations
Figure 84 Multiple disk arrays - dual host
With this solution, both hosts are connected to multiple disk arrays. The I/O infrastructure of the RAID systems is shared between the application client and the backup client.
282 | Snapshot concepts |