# The Internals of PostgreSQL

- HackerByte page: <https://hackerbyte.net/en/stories/exploration-of-the-internal-workings-of-postgresql-50358702>
- Original source: <https://www.interdb.jp/pg/index.html>
- Hacker News discussion: <https://news.ycombinator.com/item?id=50358702>
- Submitted to Hacker News: 2026-11-03T21:51:06.000Z

Exploration of the internal workings of PostgreSQL.

## AI-generated summary

This extensive documentation delves into the internal workings of PostgreSQL, covering its database cluster, process and memory architecture, query processing, and concurrency control. It aims to provide a comprehensive understanding of each subsystem for administrators and developers. The content is intended for versions 19\-beta and earlier, with recent updates including sections on Asynchronous I/O and Logical Replication.

## Key points

- Comprehensive documentation detailing PostgreSQL's internal architecture and subsystems.
- Covers versions 19\-beta and earlier, including process/memory, query processing, and replication.
- Written by Hironobu SUZUKI, author of multiple PostgreSQL and MySQL books.
- Documentation is available for free use in educational settings and non\-commercial lectures with attribution.
- Commercial use options include revenue share \(20%\) or a full buyout for €5,000,000.