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What is the purpose of concurrency control for a database? To:
Assure the accuracy, completeness and consistency of data.
Not allow inadvertent or unauthorized release of data in the database.
Prevent updating of the database to authorized users.
Prevent integrity problems when two processes attempt to update the same data at the same time.
Concurrency controls prevent data integrity problems, which can arise when two update processes access the same data item at the same time. Access controls restrict updating of the database to authorized users, and controls such as passwords prevent the inadvertent or unauthorized disclosure of data from the database. Quality controls, such as edits, ensure the accuracy, completeness and consistency of data maintained in the database.
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