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Database Concurrency Control

The process of managing simultaneous operations against a database so that data integrity is maintained and the operations do not interfere with each other in a multi-user environment. When more than one transaction is being processed against a database at the same time, the transactions are considered to be concurrent. In Database environment several users access and manipulate data at the same time. A database without concurrency control will be compromised due to interference between users. Two main problems caused by concurrency Lost update problem Inconsistent read problem Uncommitted dependency problem