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Uses of Replication

Data replication is the capability of a system to automatically make copies of its data and application objects in remote locations. Any changes to the original or to the copies are propagated to all other copies. Data replication allows users to make changes to data offline at remote locations. Changes to either the original or the remote data are synchronized with other instances of the database.

The original database is referred to as the design master. Changes to definitions of tables or other application objects can be made only to the design master. The design master is used to make special copies called replicas. Although there is only one design master, replicas can be made from other replicas. The process of the design master and replicas sharing changes is referred to as synchronization. The design master and replicas that participate in the synchronization process are collectively referred to as a replica set.


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