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Payments & fintechHardSDE-3
During a flash sale, one large merchant receives 8,000 payments per second. Every payment updates the merchant's balance row in your ledger, and the database is choking on lock contention. How do you fix it?
Asked at
FlipkartPhonePeRazorpay
Think first
Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.
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