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MySQL Deadlocks

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

A deadlock is a normal resolution of a transactional conflict. The problem is its frequency and the absence of application retry.

Collection

systemctl status mysql
journalctl -u mysql --since "1 hour ago"
SHOW FULL PROCESSLIST;
SHOW ENGINE INNODB STATUS\G

Correction

  1. Confirm the symptom with logs and metrics.
  2. Isolate the responsible account, database, query, or limit.
  3. Apply a targeted correction.
  4. Verify that the signal decreases after deployment.