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Why Every Developer Should Learn Database Internals in 2026

Maya Patel
June 18, 2026 Deep Dive 12 min read

Understanding how databases work under the hood — from B-trees to WAL files — transforms the way you design systems. Here's why it matters more than ever.

-- Understanding EXPLAIN ANALYZE output EXPLAIN ANALYZE SELECT u.id, u.name, COUNT(o.id) AS order_count FROM users u JOIN orders o ON o.user_id = u.id GROUP BY u.id;
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