DISTRIBUTED DATA AND DATABASES
Our discussion of database architecture in Chapter 2, and particularly the three level schema architecture, was based on the assumption that all the data would be held in a single database at a single site. Such an arrangement is the logical solution for a small organisation that is based at a single site. A large enterprise that is geographically dispersed could still use a single centralised database and the users could access that database from the terminals or personal computers on their desks over a communications network. On the other hand, the enterprise could opt to have its data and databases distributed throughout its sites.
There are two principal reasons why the enterprise may choose to distribute its ...
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