Tencent Database Technology

Aug 4, 2020 · Databases

Root Cause Analysis of MySQL OOM in Tencent Cloud CDB Instances

This article details a comprehensive investigation of MySQL out‑of‑memory (OOM) alerts on a Tencent Cloud CDB instance during a high‑traffic marketing event, covering background, observed symptoms, step‑by‑step debugging, analysis of server and engine memory usage, relevant MySQL bugs, fetch_cache behavior, and the final configuration recommendations to prevent OOM.