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May 6, 2020 · Databases

Understanding Percona QAN: Architecture, Slow‑Log Processing, and Performance Metrics

This article introduces Percona QAN, explains its three‑component architecture (QAN‑Agent, QAN‑API, QAN‑APP), describes the MySQL slow‑log format and key fields, and details the web UI metrics such as Load, Count, Latency, and additional diagnostic information for database performance analysis.