## Chapter 70. Database Physical Storage

**Table of Contents**

[70.1. Database File Layout](storage-file-layout.html)

[70.2. TOAST](storage-toast.html)

[70.2.1. Out-of-Line, On-Disk TOAST Storage](storage-toast.html#STORAGE-TOAST-ONDISK)

[70.2.2. Out-of-Line, In-Memory TOAST Storage](storage-toast.html#STORAGE-TOAST-INMEMORY)

[70.3. Free Space Map](storage-fsm.html)

[70.4. Visibility Map](storage-vm.html)

[70.5. The Initialization Fork](storage-init.html)

[70.6. Database Page Layout](storage-page-layout.html)

[70.6.1. Table Row Layout](storage-page-layout.html#STORAGE-TUPLE-LAYOUT)

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

