23rd May 2019: PostgreSQL 12 Beta 1 Released!
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PostgreSQL 9.1.24 Documentation
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Chapter 55. Database Physical Storage

Table of Contents
55.1. Database File Layout
55.2. TOAST
55.3. Free Space Map
55.4. Visibility Map
55.5. The Initialization Fork
55.6. Database Page Layout

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

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Examples Up Database File Layout