PostgreSQL Internals Documentation Reaches 11-Year Milestone

A comprehensive open-source guide to PostgreSQL’s internal architecture has reached its 11th anniversary since launching in September 2015. The documentation covers 12 major topic areas including process and memory architecture, query processing, concurrency control, VACUUM operations, write-ahead logging, replication strategies, and buffer management, with recent additions focusing on asynchronous I/O and logical replication.

The project aims to demystify PostgreSQL’s complex, interconnected subsystems for both database administrators and developers. It provides detailed explanations of how individual components function and interact within the broader system. The documentation has been referenced in academic papers, translated into Chinese, and remains actively maintained to cover current PostgreSQL versions including the 19 beta branch.