Optimistic Locking

Database Locking & Concurrency Cheat Sheet

Covers pessimistic and optimistic locking, isolation levels, deadlocks, and MVCC for handling concurrent reads and writes safely.

Optimistic vs Pessimistic Locking: What is the Difference?

Pessimistic locking locks a row before reading it so no one else can change it, while optimistic locking allows concurrent reads and only checks for conflicts,…

How to Design an Airline Reservation System?

An airline reservation system is designed around a strongly consistent seat-inventory service that uses optimistic locking or short-lived holds to prevent doub…

How to Design a Bidding System?

A bidding system (such as a real-time ad auction or an online auction house) is designed around a strongly consistent bid-acceptance path that atomically valid…