High Memory Consumption With Foreign Key Cascades in MySQL< 5.7.21

(Doc ID 2335142.1)

Last updated on DECEMBER 12, 2017

Applies to:

MySQL Server - Version 5.7 to 8.0 [Release 5.7 to 8.0]
Information in this document applies to any platform.

Symptoms

mysqld consumes a far higher than expected mount of memory when performing DML that modifies many rows via foreign key delete/update cascades.

 

Changes

 This issue only occurs in MySQL 5.7 (up to and including 5.7.20). What triggers the problem is doing bulk updates via cascaded foreign keys.

Cause

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