Chapter 80. Database Physical Storage
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Chapter 80. Database Physical Storage

Table of Contents

80.1. Database File Layout
80.2. TOAST
80.2.1. Out-of-Line, On-Disk TOAST Storage
80.2.2. Out-of-Line, In-Memory TOAST Storage
80.3. Free Space Map
80.4. Visibility Map
80.5. The Initialization Fork
80.6. Database Page Layout
80.6.1. Table Row Layout
80.7. Heap-Only Tuples (HOT)

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

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79.2. Implementation Home 80.1. Database File Layout