Why distributed?

There are number of reasons why data may need to be distributed over a number of databases. Businesses or institutions may be spread over a particular region (city/county) or even a national area. Data that is required at a particular database on a regular basis would be stored on a local database. This data may occasionally be required for processing by a different user from a different database. This different database could be in the same building as the local database or a location far removed from the local database. Not all data on a database may be accessible by all users, local or distributed.

There are three distinct approaches to distributing data:

• Client Multi-Server
• Distributed Database
• Replication Systems

The main differences in these systems are the extent to which the user process needs to know the location of the data, and how the processing of data takes place.

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Stuart Banner