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PostgreSQL 9.5.3 Documentation
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Chapter 63. Database Physical Storage

Table of Contents
63.1. Database File Layout
63.2. TOAST
63.2.1. Out-of-line, on-disk TOAST storage
63.2.2. Out-of-line, in-memory TOAST storage
63.3. Free Space Map
63.4. Visibility Map
63.5. The Initialization Fork
63.6. Database Page Layout

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

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ExtensibilityUpDatabase File Layout