SAP DB gives you additional downtime security by supporting the setup of standby databases.
A standby instance is a copy of the active database
instance (original instance). To keep the contents of your database
up-to-date, the log backups of the
original instance are imported at regular intervals.
The standby instance
always has the
operational state
ADMIN.
If you experience problems with the original instance, you start operating the standby instance immediately, and carry on working without a lengthy period of downtime.
Depending on the configuration, you can also restore the standby instance to a specified state in the past.
See also: Example