61.
For some relations, changing the data can have undesirable consequences called:
Answer: B
Correct answer: modification anomalies.
A poorly structured relation makes some changes impossible to perform cleanly: an insertion anomaly prevents a fact being recorded until some unrelated fact is known, a deletion anomaly destroys information as a side effect, and an update anomaly requires the same value to be changed in many places. Normalisation exists to remove them.
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