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Data redundancy — AQA GCSE Computer Science Definition

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Computer Science
Key terms
Data redundancy

GCSE Computer Science · key term

Data redundancy

Definition

Unnecessary duplication of the same data within a database.

Used by AQA

How each exam board covers it

AQA GCSE Computer Science · 8525

Paper 2

The student names describe different people, but each copy of Ms Green and B4 describes the same tutor and room. This unnecessary duplication is data redundancy. It uses extra storage and means that maintaining one fact can require changes to many records.
Revise: Benefits of Relational Databases

AQA Computer Science past papers

Related key terms

Data inconsistency
Foreign key
Primary key
Relational database

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