Troubleshooting tldr
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The document discusses steps for troubleshooting MySQL issues: (1) define the problem precisely, (2) collect diagnostic data from the operating system and MySQL, and (3) examine the error log. It then provides guidance on diagnosing specific issues like crashes, performance problems, table corruption, and replication errors.
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Oow MySQL Whats new in security overview sept 2017 v1
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Do you feel like you are rolling the dice when deploying changes?
Are you content with the current State of Affairs or do you aspire to raise your game by several levels?
Finally, are you willing to make the required sacrifices to achieve high performance DevOps?
Warning:
This session is NOT about the latest/coolest set of technologies that promise to solve your problem.
This session is NOT about a product you can buy.
This session is about recognizing and understanding the First Order Principles that underlie successful DevOps.
Based on this we are going to develop a set of goals, how to measure them and specific steps on how to achieve them.
Furthermore, we will discuss the pitfalls that derail so many Organizations in this endeavor, how to circumvent them and even turn them into opportunities.
However, be advised, this session is not for those that look for an easy & quick solution.
The session is intended to be interactive, and challenge the way you think.
If you are willing to have an open mind and put up the extra effort, by the end of this session, we are going to have built a roadmap with goals and specific steps that lead to High Performance DevOps.
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- 4. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Step 1 • Define the problem • Must know what is “normal”, to know what is not “normal” - and how much • Be exact! • Read and understand the manual for the problematic area 4
- 5. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Step 2 • Collect the diagnostic data – OS data – MySQL data • May need to collect the diagnostic data during the problem – Monitoring – Maybe pt_stalk 5
- 6. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Error Log • First place to look • Can give history and context to any problem • Error message(s) 6
- 7. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | General Server Crash • Error log – Stack trace and error message(s) • OS error log around the crash time – OOM • Any and all diagnostic data available – MySQL and OS monitoring data (graphs and raw data) – Core file? • Any information about what was happening before and during the crash – External scripts running / Applications / Cronjobs / Backups / Etc. 7
- 8. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | General Performance Issues • Error log • COS data (Ex: IO, CPU, Memory, NUMA, etc.) • SHOW GLOBAL VARIABLES • SHOW GLOBAL STATUS • SHOW FULL PROCESSLIST • SHOW ENGINE INNODB STATUS • Information from PERFORMANCE_SCHEMA 8
- 9. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Query Performance Issues • Error log • Slow query log • EXPLAIN • SHOW CREATE TABLE • SHOW TABLE STATUS • SHOW INDEXES • Profile the query 9
- 10. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Table Corruption • InnoDB – System may or may not be able to start back up – Error log • Error message • Stack trace – Known issue? • Bug • Data dictionary issues – Rebuild • Go to a backup • Force recovery 10
- 11. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Table Corruption • MyISAM – Error log – Marked as crashed? – myisamchk or mysqlcheck • Server up or down? • Backup corrupted files before - some data loss can happen – Backups are always an option (con’t) 11
- 12. Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Replication Issues • Error log • SHOW MASTER STATUS • my.cnf / my.ini • SHOW GLOBAL VARIABLES • SHOW SLAVE STATUS 12