Database integrity ensures that data in the database is correct and consistent. Database integrity mechanisms can be divided into those mechanisms that support system integrity, and those that enforce relational database integrity properties (like entity integrity. referential integrity. transaction integrity. and business rules).· Traditional system integrity involves ensuring that the data inserted into the system is the same as the contents of that data when it is subsequently retrieved. Further, data must not be altered or deleted by a user who is not authorized to do so.
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