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MySQL Slow Queries

Structured Markdown documentation to diagnose, measure, and optimize MySQL.

This page is original PmaControl documentation. It keeps a practical index structure for MySQL optimization work, without copying third-party content or depending on an external product.

Reading

The slow log captures queries above a threshold. Group by digest to avoid treating thousands of variants of the same problem separately.

Useful Measurements

SHOW GLOBAL STATUS LIKE 'Questions';
SHOW GLOBAL STATUS LIKE 'Threads_running';
SHOW GLOBAL STATUS LIKE 'Slow_queries';
SHOW GLOBAL STATUS LIKE 'Aborted_clients';

Diagnosis

Always compare the metric with application load and time. An isolated counter is not enough: the per-minute delta and correlation with incidents provide the usable signal.

Possible Actions

  • Identify the responsible queries or connections.
  • Check MySQL and system limits.
  • Test a targeted correction, then measure the same metric after the change.