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MediumSystem designTechnical
A full export requires every eligible row. Transfer dominates request time. Why is adding LIMIT 50 not a valid optimization, and what alternatives preserve the contract?
1Give yourself 5 minutes
2Answer out loud, not in your head
3Then compare with the answer below
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Reference answer
Then expect these follow-ups
How do mutable sort keys affect pagination?
What does EXPLAIN ANALYZE actually execute?
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