Can Foreign Key Constraints Be Deferred Until Commit in MySQL?

Question: Can Foreign Key Constraints Be Deferred Until Commit in MySQL?

This question arises when performing bulk inserts in MySQL, particularly when attempting to insert data into tables linked by foreign keys. Despite executing insertions within a transaction, constraint errors can occur.

Answer:

Unfortunately, according to MySQL documentation, referential integrity checks in InnoDB are performed immediately during each row insertion, rather than deferred until transaction commit. This behavior deviates from the SQL standard, which specifies deferred constraint checking.

The immediate checks impose limitations, especially when handling self-referential tables or scenarios where foreign key references need to be updated sequentially. Until MySQL implements deferred constraint checking, such operations may require alternative approaches.

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