MySQL Foreign Key Cascade Operations Hit the Binary Log

3 months ago

MySQL 9.6 moves foreign key enforcement from InnoDB to the SQL layer, addressing a long-standing limitation.
Previously, cascading operations were invisible to the binary log, causing issues with replication and CDC pipelines.
The new approach ensures all cascaded operations are logged in the binary log, providing complete visibility.
A new variable, innodb_native_foreign_keys, allows reverting to the old behavior for migration purposes.
Performance benchmarks show no significant impact from the architectural change.
Future enhancements may include support for triggers on cascaded changes and broader storage engine compatibility.

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