MySQL troubleshooting tldr
Sometimes the biggest problem is not knowing the correct question(s) to ask for the problem. This talk will teach you what “questions” to ask a MySQL server so you will be able to gather the necessary data to be able diagnose various generic problems in MySQL.
With a given generic server problem - what data should you initially be collecting to diagnose the root cause of the problem.
General Server Performance Issues
- Error log
- OS Data (Ex: IO, CPU, Memory, NUMA, etc)
- SHOW GLOBAL VARIABLES
- SHOW GLOBAL STATUS
- SHOW FULL PROCESSLIST
- SHOW ENGINE INNODB STATUS
- Information from INFORMATION_SCHEMA
Ligaya Turmelle is a full time Goddess, part time MySQL DBA, occasional PHP programmer, and frequent world traveler. She currently has visited or lived in 21 countries and now resides in Florida with her husband and their Belgian Malinois. As a MySQL Support Engineer for Oracle she still manages to stay involved with the PHP Community as a founding Principal of phpwomen.org, blogger and long-time busy body of the PHPCommunity channel (#phpc) on freenode. She hopes to one day actually meet all the people she talks to. Now for all the letters – OCP: MySQL 5.6 DBA, OCP: MySQL 5.6 Dev, CMDBA (5.0), CMDEV (5.0), MySQL Core (4.1), ZCE (PHP4&5) and Oracle ACE for MySQL.