PostgreSQL Internals: Free Deep-Dive Reference Hits 11 Years
Original: The Internals of PostgreSQL
Why This Matters
One of the most detailed free PostgreSQL internals references, actively maintained for 11 years.
Hironobu Suzuki's 'The Internals of PostgreSQL' marks its 11th anniversary in Sept 2026, adding Chapter 12 on Logical Replication and Section 8.5 on Async I/O, with 85,577 words total—29% growth since 2018.
Hironobu Suzuki's 'The Internals of PostgreSQL' — a free, openly available technical reference at interdb.jp — turned 11 on September 26, 2026. The site has grown substantially since tracking began in June 2018: word count climbed from 66,417 to 85,577, a 29% increase, with 49 new diagrams added along the way.
Recent additions include Chapter 12 on Logical Replication (published May 2026 in beta), Section 8.5 covering Asynchronous I/O (June 2026), and earlier additions on Parallel Query, Incremental Backup, and Cardinality Estimation. A May 2026 refactor trimmed 4,890 words (5.6%) for clarity, while older content targeting PostgreSQL 9.5 and below has been progressively retired in favor of 9.6-and-later coverage.
Suzuki notes he is open to international roles — particularly in Europe, Southeast Asia, or the Southern Hemisphere — seeking either visa-sponsored PostgreSQL positions or remote work compatible with a digital nomad lifestyle.