Postgres-XC 1.0.4 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

Note: At present, this section is just taken from PostgreSQL documentation and is subject to revision for Postgres-XC.

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

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