Chapter 67. Database Physical Storage

Table of Contents

67.1. Database File Layout
67.2. TOAST
67.2.1. Out-of-line, on-disk TOAST storage
67.2.2. Out-of-line, in-memory TOAST storage
67.3. Free Space Map
67.4. Visibility Map
67.5. The Initialization Fork
67.6. Database Page Layout

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