Slow Database, High Cpu Usage, and Many InnoDB Semaphore Waits With All Performance Schema Instruments Enabled; MySQL Workbench Performance Reports
Last updated on MARCH 10, 2017
Applies to:MySQL Server - Version 5.6 and later
MySQL Workbench - Version 6.1 and later
Information in this document applies to any platform.
After enabling all the Performance Schema instruments, one or more of the following symptoms are observed:
- The performance of MySQL is slow.
- The CPU usage is higher than normal.
- The number of InnoDB semaphore waits are higher than normal, although SHOW ENGINE INNODB STATUS does not necessarily show any semaphore waits.
The Performance Schema instruments have all been enabled.
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