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Historical version. PostgreSQL 9.3 has reached end of support. 2018-11-08. See the current manual.

Chapter 58. Database Physical Storage

Table of Contents
58.1. Database File Layout
58.2. TOAST
58.3. Free Space Map
58.4. Visibility Map
58.5. The Initialization Fork
58.6. Database Page Layout

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

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Read the upstream documentation. For corrections, first check the current manual.