How to Address High CPU Load on a Single MySQL Core
To resolve a MySQL single‑core CPU bottleneck, examine and tune slow queries and indexes, eliminate heavy lock contention, break large transactions into smaller ones, and employ tools like perf top to pinpoint performance hotspots, as recommended by Tencent Cloud Database expert Liu Di.
【DiB Classroom】 is a series of training courses for database developers, DB operations staff, and cloud operations staff led by Tencent Cloud Database product manager DiB. This Q&A episode answers the question: MySQL runtime system shows high CPU pressure on a single core – how to handle it?
Problem: MySQL experiences a single‑core CPU bottleneck during runtime.
Core advice:
Inspect slow SQL statements, optimize index usage and business logic, and avoid massive lock conflicts.
Reduce the use of large transactions; split them into smaller transactions.
Use the perf top tool to investigate performance bottlenecks.
Author: Liu Di, Tencent Cloud Database product manager, Vice President of the Open‑Source Database Committee of the China Computer Industry Association. He works in the Tencent Cloud Database (TencentDB) product team and has managed MySQL, MongoDB, and Redis platforms for major Tencent services.
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