The Internals of PostgreSQL is a comprehensive, open-source documentation project explaining the inner workings of the PostgreSQL database system. First published on 26 September 2015, it covers versions up to 19-beta and details subsystems like Query Processing, Concurrency Control, Buffer Manager, and Streaming Replication. Updated regularly, recent additions include Logical Replication (Beta) and Asynchronous I/O.
Authored by Hironobu Suzuki, a seasoned software engineer and former director of the Japan PostgreSQL Users Group, the documentation aims to provide a holistic understanding of PostgreSQL’s architecture for administrators and integrators. It has been referenced in academic papers and translated into Chinese (June 2019). The content is freely usable by educators and students, with clear guidelines to prevent misuse.
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