PostgreSQL

Table of Contents

73.1. Database File Layout

73.2. TOAST

73.2.1. Out-of-Line, On-Disk TOAST Storage

73.2.2. Out-of-Line, In-Memory TOAST Storage

73.3. Free Space Map

73.4. Visibility Map

73.5. The Initialization Fork

73.6. Database Page Layout

73.6.1. Table Row Layout

73.7. Heap-Only Tuples (HOT)

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

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