Chapter 64. Database Physical Storage

Table of Contents
64.1. Database File Layout
64.2. TOAST
64.2.1. Out-of-line, on-disk TOAST storage
64.2.2. Out-of-line, in-memory TOAST storage
64.3. Free Space Map
64.4. Visibility Map
64.5. The Initialization Fork
64.6. Database Page Layout

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