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Long Semaphore Wait For Mutex Created in File and Locked in File When Querying a Table That Is Parent Of Many Foreign Keys (Doc ID 2039457.1)

Last updated on MARCH 21, 2019

Applies to:

MySQL Server - Version 5.5 to 5.7 [Release 5.5 to 5.7]
Information in this document applies to any platform.


When a query triggers many foreign keys to read into the InnoDB data dictionary, and then executing another DDL or INSERT, UPDATE, DELETE, or similar query, an error similar to the following occurs:


This is most likely to be an issue in releases earlier than 5.5.39, 5.6.20, and 5.7.5.




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