What is database concurrency and why is it important?

What is database concurrency and why is it important?

Database concurrency refers to the ability of multiple users to access and modify a database simultaneously. It's important because it ensures that users can work efficiently without interfering with each other's operations.

How does concurrency control work in databases?

Concurrency control is a mechanism that manages simultaneous operations without conflicting. It uses techniques like locking, timestamps, and optimistic concurrency to maintain data integrity.

What are the different types of concurrency control methods?

The main types of concurrency control methods include pessimistic locking, optimistic locking, and multi-version concurrency control (MVCC). Each has its own advantages and use cases.

Can you explain optimistic vs pessimistic locking?

Sure! Pessimistic locking assumes conflicts will happen and locks resources upfront, while optimistic locking assumes conflicts are rare and checks for conflicts before committing changes.