Data replication
Data Replication refers to a data storage and backup strategy that replicates the data on the host machine. The data is then copied onto a remote data storage location.
Data replication is a new trend in data storage technologies wherein the data backup is entirely independent of local data center physical storage.
Online data replication
In online data replication, the data backup is made on a real time basis wherein the data from the host server is copied onto the remote location as soon as the data is changed
Offline data replication
In offline data replication, a backup of the datafile is taken on a remote location on an offline basis,say once a day. Offline data replication is preferred in environments where the number of transactions is very huge and doing real time data replication may affect the performance of the system.