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War Story: How a PostgreSQL 17 Deadlock Caused 30 Minutes of Downtime for Our E-Commerce Checkout Flow

DEV Community·ANKUSH CHOUDHARY JOHAL·6 months ago
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At 14:17 UTC on October 12, 2024, our e-commerce checkout flow ground to a halt for 30 minutes, costing $142,000 in lost sales and 12,000 abandoned carts. The root cause? A silent, self-deadlock in PostgreSQL 17’s new parallel query executor that no monitoring tool caught until we dug into raw WAL logs.

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