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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.
Snapshot concepts282