Navigation : PostgreSQL 15.4 Documentation > Chapter 67. B-Tree Indexes Chapter 67. B-Tree Indexes Chapter 67. B-Tree Indexes Prev Up Part VII. Internals Home Next Table of Contents 67.1. Introduction 67.2. Behavior of B-Tree Operator Classes 67.3. B-Tree Support Functions 67.4. Implementation 67.4.1. B-Tree Structure 67.4.2. Bottom-up Index Deletion 67.4.3. Deduplication