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](storage-toast.md#STORAGE-TOAST-INMEMORY)

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.