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Which problems does data redundancy cause?

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Data redundancy is a data organization issue that allows the unnecessary

duplication of data within your Microsoft Access database. A change

or modification, to redundant data, requires that you make changes

to multiple fields of a database. While this is the expected behaviour

for flat file database designs and spreadsheets, it defeats the purpose

of relational database designs. The data relationships, inherent in

a relational database, should allow you to maintain a single data

field, at one location, and make the database's relational model

responsible to port any changes, to that data field, across the database.

Redundant data wastes valuable space and creates troubling database

maintenance problems
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