NOTE
MySQL Performance Tuning
Evidence-driven tuning across schema, SQL, indexes, memory, concurrency, I/O, and architecture.
This is a historical learning note and may contain outdated or incomplete understanding.
Tune from measured bottlenecks. Start with workload/query patterns and plans, then schema/index design, lock/contention behavior, buffer-pool/cache efficiency, storage latency, connection/concurrency limits, and replication/backup load.
Configuration knobs cannot rescue a fundamentally expensive query or missing data model boundary. Establish a baseline, change one important variable at a time, and validate p95/p99 latency and resource behavior under representative load.