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Why Synchronization or Replication?
Working Offline
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Perhaps the biggest reason for synchronization and replication is to accord users the ability to work off-line in a disconnected model. Now, mobile users are able to download the data they need before they travel, can edit that data and then synchronize upon their return.
Data Availability
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One of the key benefits of a data replication system is that data is made available locally, rather than through potentially expensive, less reliable, and slow connections to a single central database. Data is accessible locally even in the absence of any connection to a central server, so that you are not cut off from data in the event of a failure of a long-distance network connection.
Response time
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Replication improves response times for data requests for two reasons. Retrieval rates are faster because requests are processed on a local server, without accessing a wide area network. Also, local processing offloads work from a central database server so that competition for processor time is decreased.
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