Chapter 66. Database Physical Storage
| Up | Part VII. Internals | Home |

## 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
  66.6.1. Table Row Layout
66.7. Heap-Only Tuples (HOT)

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

| Up |
| Home |