What are the different concurrency control methods in databases?

What are the different concurrency control methods in databases?

There are several concurrency control methods, including pessimistic locking, optimistic locking, and timestamp ordering. Would you like to know more about each?

Yes, can you explain pessimistic locking?

Pessimistic locking involves locking the data when a transaction is being processed, preventing other transactions from accessing it until the lock is released. This ensures data integrity but can lead to reduced performance due to waiting.

What about optimistic locking?

Optimistic locking allows transactions to proceed without locking the data initially. Instead, it checks for conflicts before committing. If a conflict is detected, the transaction is rolled back. This method is more efficient in low-contention scenarios.

Which method is generally preferred?

It depends on the application. Pessimistic locking is preferred in high-contention environments, while optimistic locking is better for low-contention scenarios.