3. Why use a distributed database?
Many organisations have branches and offices located across the country or even the world.
It may be that each branch only needs to access their own data 90% of the time and only occasionally have a need to access remote information. On the other hand the central office needs to have an up to date version of all the data as well.
With a single central database, all queries and updates have to travel across a network. This may cause a heavy load on the system. It also means if the central database breaks or the network goes down, the entire organisation is affected.
A distributed database solves some of these issues.
With a distributed database, the central database is updated over night as a batch operation, but day-to-day work in the branches is carried out using the local portion of the database. If the network fails, then they can carry on as normal until it is fixed.
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