Distributed databases

Carla Taylor
Mind Map by Carla Taylor, updated more than 1 year ago
Carla Taylor
Created by Carla Taylor over 5 years ago
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Description

A2 ICT WJEC

Resource summary

Distributed databases
1 What is it?
1.1 A single logical database whose parts are physically located in more than one place, each location is accessible across a network
1.2 Many organisations have offices and branches all over the world
1.2.1 They have immediate access to their own information as that information is what they'll be needing to access most of the time
1.2.1.1 On the other had the central office needs to have an update version of the data as well
1.2.1.1.1 With a single central databse, all queries and updates have to travel across a network.
1.2.1.1.1.1 This may cause a heavy load on the system
1.2.1.1.1.2 This means if the central database breaks or the network goes down, the entire organisation is affected
1.2.1.1.1.3 With a distributed database, the central database is updated over night as a batch operation
1.2.2 A supermarket stock system with many branches
1.2.3 A travel company with branches across the country
1.2.4 An international car dealer with dealers around the world
2 partitioned database
3 duplicated database
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