Chapter 66. Database Physical Storage

Table of Contents

66.1. Database File Layout

66.2. TOAST

66.2.1. Out-of-line, on-disk TOAST storage
66.2.2. Out-of-line, in-memory TOAST storage

66.3. Free Space Map

66.4. Visibility Map

66.5. The Initialization Fork

66.6. Database Page Layout

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