Master MySQL Composite Indexes: Unlock the Leftmost Prefix Principle

This article explains what MySQL composite (multi‑column) indexes are, how they are built and ordered, the leftmost‑prefix rule that governs their usage, factors such as cardinality and selectivity for optimal design, and common scenarios where the index may become ineffective.

Composite IndexDatabase OptimizationIndex Selectivity

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Master MySQL Composite Indexes: Unlock the Leftmost Prefix Principle

Aikesheng Open Source Community

Jan 20, 2021 · Databases

Understanding MySQL Prefix Indexes and Their Optimization

This article explains the concept, creation, and performance benefits of MySQL prefix indexes, demonstrates how to choose an optimal prefix length using selectivity calculations, and presents practical techniques for handling both prefix and suffix search patterns.

Index Selectivitymysqlsql

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Understanding MySQL Prefix Indexes and Their Optimization