Chapter 71. Database Physical Storage

Table of Contents

71.1. Database File Layout
71.2. TOAST
71.2.1. Out-of-Line, On-Disk TOAST Storage
71.2.2. Out-of-Line, In-Memory TOAST Storage
71.3. Free Space Map
71.4. Visibility Map
71.5. The Initialization Fork
71.6. Database Page Layout
71.6.1. Table Row Layout

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