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PostgreSQL 9.6.0 Documentation
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Chapter 65. Database Physical Storage

Table of Contents
65.1. Database File Layout
65.2. TOAST
65.2.1. Out-of-line, on-disk TOAST storage
65.2.2. Out-of-line, in-memory TOAST storage
65.3. Free Space Map
65.4. Visibility Map
65.5. The Initialization Fork
65.6. Database Page Layout

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

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ExtensibilityUpDatabase File Layout