🛒Company Switches Redis to MySQL for Inventory Reservations
MySQL's SKIP LOCKED Feature Saves The Day For Inventory Management
TL;DR
A company swapped Redis with MySQL to manage inventory reservations during checkout. This move ensures items are available and prevents overselling or underselling on Black Friday.
The company replaced Redis with MySQL for inventory reservations, ensuring availability during peak sales periods like Black Friday. The switch was driven by the need for high-throughput and ACID compliance, addressing previous contention issues. During the record-breaking $5.1 million per minute in sales on Black Friday 2025, MySQL's SKIP LOCKED feature allowed for one row per inventory unit, significantly improving performance and reliability.
Key Points
MySQL's SKIP LOCKED feature introduced a new design: one row per inventory unit, improving performance and reliability.
The system hit high-throughput targets during the record-breaking $5.1 million in sales per minute on Black Friday 2025.
A composite primary key (shop_id, inventory_item_id, inventory_group_id, id) was used to reduce lock count and improve throughput.
Consistent lock ordering was implemented to avoid deadlocks by standardizing the order: reserve always DELETEs from units table first, then INSERTs into reserved_quantities.
The solution uses READ COMMITTED transaction isolation level for replenishment transactions to avoid gap locks.
Why It Matters
If you're managing inventory in a high-traffic e-commerce platform, MySQL's SKIP LOCKED feature can significantly improve performance and reliability. This move ensures items are available during peak sales periods without overselling or underselling.
Frequently Asked Questions
Why does this matter?
If you're managing inventory in a high-traffic e-commerce platform, MySQL's SKIP LOCKED feature can significantly improve performance and reliability. This move ensures items are available during peak sales periods without overselling or underselling.
What happened?
A company swapped Redis with MySQL to manage inventory reservations during checkout. This move ensures items are available and prevents overselling or underselling on Black Friday.
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