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2 General information
This chapter provides general information on maintaining data and us ing databases. It also
explains the various database models and the differences between them. It concludes with
a general overview of UDS/SQL.

2.1 Modern data organization

Now that data processing is used at all levels in an organization, the qualit ative and quanti-
tative demands on data storage and organization have increased considerably. Moreover,
they are subject to constant change.
The reasons for this change are:
– rapid growth of data volumes
– client/server applications
– transition from data to information processing
– influence of new communication media and technology
– increasing tendencies towards decentralization.
It is now widely recognized that data is as an independent factor in production alon gside
traditional factors such as accounting, personnel and infrastructure.