Pessimistic Concurrency Control
Pessimistic Concurrency Control is a database management technique that prevents conflicts by locking data resources during transactions, assuming that conflicts are likely to occur. It ensures data consistency by allowing only one transaction to access a resource at a time, typically using locks like shared or exclusive locks. This approach is common in relational databases to maintain ACID properties and avoid issues like dirty reads or lost updates.
Developers should use Pessimistic Concurrency Control in high-conflict environments, such as financial systems or inventory management, where data integrity is critical and concurrent updates could lead to errors. It is ideal for scenarios with long-running transactions or when strict consistency is required, as it prevents race conditions by serializing access to resources. However, it can reduce performance due to lock contention, so it's best suited for applications where accuracy outweighs throughput concerns.