Database deadlocks are one of those production issues that don't announce themselves with a flashy error page — they hide in your MySQL slow query log, surface as mysterious 500 errors during peak traffic, and leave your team scratching their heads at 2 AM. If you're running Magento 2 at scale, deadlocks are not a question of if , but when .

This guide covers the full picture: why deadlocks happen in Magento specifically, how to detect them before they cause real damage, and concrete prevention strategies you can implement today.

What Is a Database Deadlock?

A deadlock occurs when two or more transactions are each waiting for the other to release a lock, creating a circular dependency that can never resolve on its own.…