Lesson 1k Concurrency control .
Concurrency is when more than one user can access the same file simultaneously.
A good example is the bank ATM machine. The answer is concurrency control . The purpose of concurrency control is to allow more than one user access to the same file simultaneously while ensuring database accuracy. In a concurrent environment, this accuracy is sustained when the final state of the database is the same as if the transactions were completed serially. Concurrency control is commonly achieved with locks.