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Data Access · interview question

What is the healthiest performance judgment around repository boundaries?

Multiple choiceHardchapter-11-curatedpremiumdata-accessrepository-boundaries
python
class OrderRepository:
    def by_id(self, order_id: str) -> tuple | None:
        return connection.execute("SELECT id FROM orders WHERE id = ?", (order_id,)).fetchone()
Choose one answer
Answer and explanation

Correct answer

B. Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.

Why

Premature optimization is usually weaker than targeted optimization backed by measurement.

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