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Chapter 68. Database Physical Storage

Table of Contents

68.1. Database File Layout
68.2. TOAST
68.2.1. Out-of-Line, On-Disk TOAST Storage
68.2.2. Out-of-Line, In-Memory TOAST Storage
68.3. Free Space Map
68.4. Visibility Map
68.5. The Initialization Fork
68.6. Database Page Layout
68.6.1. Table Row Layout

This chapter provides an overview of the physical storage format used by PostgreSQL databases.