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Chapter 69. Database Physical Storage
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Chapter 69. Database Physical Storage

Table of Contents

69.1. Database File Layout

69.2. TOAST

69.2.1. Out-of-line, on-disk TOAST storage
69.2.2. Out-of-line, in-memory TOAST storage

69.3. Free Space Map

69.4. Visibility Map

69.5. The Initialization Fork

69.6. Database Page Layout

69.7. Heap-Only Tuples (HOT)

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

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68.2. Implementation	Home	69.1. Database File Layout

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