Architecture Digest

Jan 28, 2018 · Backend Development

Handling High-Concurrency Flash Sale in PHP: Preventing Overselling with Database Locks, Transactions, File Locks, and Redis Queues

This article explains the challenges of high‑concurrency flash‑sale systems, analyzes the overselling problem caused by simultaneous database updates, and presents four optimization strategies—including unsigned fields, MySQL transactions, file locks, and Redis queues—accompanied by complete PHP code examples and test data.