Nice for fault-tolerant databases too
... in cases where the standby system and database instance(s) are physically remote from the live instance.
Typically this type of replication means sending copies of the live system's transaction log to the backup system(s) and applying the transferred log items to the standby database(s) in as close to real-time as possible. Speeding up transaction log transfer minimizes cut-over time because a standby system must not accept the live workload until its database is fully up to date.