Final answer:
Concurrency control in a DBMS ensures data integrity and consistency when multiple transactions occur concurrently. It prevents update conflicts, temporary inconsistencies, and deadlocks, while maintaining ACID properties for successful database operations and recovery.
Step-by-step explanation:
Concurrency control is a critical aspect of a Database Management System (DBMS). It refers to the mechanisms a DBMS employs to manage simultaneous operations without allowing interference between transactions. The main goal is to ensure the integrity and consistency of data when it is being accessed by multiple users or processes at the same time. Furthermore, concurrency control is responsible for maintaining isolation between transactions while ensuring that the database operations are performed efficiently.
Without proper concurrency control, databases may encounter several issues such as update conflicts, the temporary inconsistency of data, and deadlocks. For example, if two users try to update the same record at the same time, without concurrency control, the last update might overwrite the first, leading to potential loss of data. Additionally, in ensuring data consistency, concurrency control also enables a database to recover from faults and maintain transaction atomicity, consistency, isolation, and durability (ACID properties).