12.1. Introduction
Transaction is a logical unit of work that represents real-world events of any organisation or an enterprise whereas concurrency control is the management of concurrent transaction execution. Transaction processing systems execute database transactions with large databases and hundreds of concurrent users, for example, railway and air reservations systems, banking system, credit card processing, stock market monitoring, super market inventory and checkouts and so on. Transaction processing and concurrency control form important activities of any database system.
In this chapter, we will learn the main properties of database transaction and how SQL can be used to present transactions. We will discuss the concurrency control ...
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