Slow Database, High Cpu Usage, and Many InnoDB Semaphore Waits With All Performance Schema Instruments Enabled; MySQL Workbench Performance Reports
(Doc ID 1682627.1)
Last updated on FEBRUARY 26, 2020
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.
One way this can happen is when you go to see one of the Performance Reports in MySQL Workbench 6.1 or later. This requires enabling all of the Performance Schema instruments and most of the consumers.
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