Discussion
Needing to assess the validity of assumed referential integrity constraints on foreign keys is a(n) ________ of normalization.
Answer: D
Correct answer: disadvantage
Normalization decomposes one relation into several linked by foreign keys, and every foreign key brings a referential integrity constraint that must be assessed and then enforced. That work would not exist without the decomposition, so it counts as a cost of normalizing - the second of the two standard disadvantages, alongside the more complicated SQL that the extra tables require.
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