Chapter 72. Database Physical Storage

Table of Contents

72.1. Database File Layout
72.2. TOAST
72.2.1. Out-of-Line, On-Disk TOAST Storage
72.2.2. Out-of-Line, In-Memory TOAST Storage
72.3. Free Space Map
72.4. Visibility Map
72.5. The Initialization Fork
72.6. Database Page Layout
72.6.1. Table Row Layout

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