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1329430
Distributed databases
Description
A2 ICT WJEC
Mind Map by
Carla Taylor
, updated more than 1 year ago
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Created by
Carla Taylor
over 9 years ago
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Resource summary
Distributed databases
What is it?
A single logical database whose parts are physically located in more than one place, each location is accessible across a network
Many organisations have offices and branches all over the world
They have immediate access to their own information as that information is what they'll be needing to access most of the time
On the other had the central office needs to have an update version of the data as well
With a single central databse, all queries and updates have to travel across a network.
This may cause a heavy load on the system
This means if the central database breaks or the network goes down, the entire organisation is affected
With a distributed database, the central database is updated over night as a batch operation
A supermarket stock system with many branches
A travel company with branches across the country
An international car dealer with dealers around the world
partitioned database
duplicated database
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