Conquering Database Counter Lock Contention: The Slotted Counter Pattern

Updating database counters in high-concurrency scenarios often leads to lock contention, causing performance degradation and even deadlocks. This article introduces a pattern called "slotted counters" that effectively mitigates lock contention by distributing counters across multiple slots. This pattern distributes update operations across multiple rows, eliminating the bottleneck of single-row updates and improving concurrency performance. GitHub used a similar solution to address counting issues; the core idea is to distribute update operations across multiple rows and then aggregate them to get the final count.