A database without proper indexes can work well during testing and fail badly in production. When records grow from hundreds to millions, full-table scans become expensive. Indexes help the database find data faster, especially on columns used in WHERE, JOIN, ORDER BY, and dashboard filters. The key is not to index everything, but to index according to real query patterns.

#DatabaseDesign #SQL #MySQL #PostgreSQL #BackendEngineering #PerformanceOptimization #DataEngineering #SoftwareDevelopment
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