Data Replication refers to the process of representing database objects at more than one distinct site. High-availability data replication provides synchronous data replication for Dynamic Server. Use HDR if you require a hot standby.
One way of replicating data is simply to copy a database to a database server installed on a different computer. This copy allows reports to access the data without disturbing client applications that use the original database.
The database server implements nearly transparent data replication of entire database servers. All the data that one database server manages is replicated and dynamically updated on another database server, often at a separate geographical location. HDR provides a way to maintain a backup copy of the entire database server that applications can access quickly in the event of a catastrophic failure.