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.