Chapter 70. Database Physical Storage

Table of Contents

70.1. Database File Layout
70.2. TOAST
70.2.1. Out-of-Line, On-Disk TOAST Storage
70.2.2. Out-of-Line, In-Memory TOAST Storage
70.3. Free Space Map
70.4. Visibility Map
70.5. The Initialization Fork
70.6. Database Page Layout
70.6.1. Table Row Layout
70.7. Heap-Only Tuples (HOT)

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