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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 Persistence

Data persistence means that in a DBMS all data is maintained as long as it is not deleted explicitly. The life span of data needs to be determined directly or indirectly be the user and must not be dependent on system features. Additionally data once stored in a database must not be lost.
Changes of a database which are done by a transaction are persistent. When a transaction is finished even a system crash cannot put the data in danger.

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