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Troubleshooting tldr
1.
Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | MySQL Troubleshooting TL;DR Ligaya Turmelle Principal Technical Support Engineer - MySQL ligaya.turmelle@oracle.com @lig rootconf - May 2017
2.
Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | MySQL Troubleshooting TL;DR Ligaya Turmelle Principal Technical Support Engineer - MySQL ligaya.turmelle@oracle.com @lig rootconf - May 2017
3.
Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle. 3
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
13.
Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | MySQL Troubleshooting TL;DR Ligaya Turmelle Principal Technical Support Engineer - MySQL ligaya.turmelle@oracle.com @lig rootconf - May 2017
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