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What is the property of InnoDB that enforces foreign key relationships stay intact?

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What is the property of InnoDB that enforces foreign key relationships stay intact?

(a) atomicity

(b) durability

(c) consistency

(d) referential integrity

The question was posed to me in examination.

The query is from Maintaining Logs in chapter General MySQL Administration of MySQL

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Right answer is (d) referential integrity

For explanation I would say: The storage engine responsible for providing foreign key support is InnoDB. It enforces that the rules guarantee the foreign key relationship stays intact with no mismatching of data.

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