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Lesson Navigation IconIntroduction DBS

Unit Navigation IconDefinition of Terms

Unit Navigation IconCharacteristics

LO Navigation IconConcurrent Use

LO Navigation IconStructured Data

LO Navigation IconSeparation of Data and Applications

LO Navigation IconData Integrity

LO Navigation IconTransactions

LO Navigation IconData Persistence

LO Navigation IconData Views

Unit Navigation IconExample Applications

Unit Navigation IconAdvantages and Disadvantages

Unit Navigation IconTasks

Unit Navigation IconSummary

Unit Navigation IconRecommended Reading

Unit Navigation IconGlossary

Unit Navigation IconBibliography

Unit Navigation IconMetadata


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Data Integrity

Data integrity is a byword for the quality and the reliability of the data of a database system. In a broader sense data integrity includes also the protection of the database from unauthorised access (confidentiality) and unauthorised changes.

Data reflect facts of the real world. Logically, it is demanded that this reflection is done correctly. A DBMS should support the task to bring only correct and consistent data into the database. Additionally, correct transactions ensure that the consistency is maintained during the operation of the system.

An example for inconsistency would be if contradictory statements were saved in the same database.

Two Database Tables with Contradictory DatasetsTwo Database Tables with Contradictory Datasets
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