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Jun 5, 2019 · Databases

How to Scale SQL Databases for 20,000+ Concurrent Users: Single Instance, Sharding, and Read‑Write Separation

This article explains how to handle 20,000+ concurrent SQL requests by moving from a simple single‑instance setup to multi‑instance sharding and finally to read‑write separation, detailing the architectural decisions, routing algorithms, and practical limits for high‑traffic e‑commerce systems.