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PostgreSQL Internals Mastery

Volume I: Foundations & Core Concepts

Stop treating PostgreSQL as a black box. Whether you are troubleshooting a production outage at 3 AM or designing a system to handle 10,000 transactions per second, you cannot optimize what you do not understand.

PostgreSQL Internals Mastery is a modular curriculum designed for senior engineers who need to understand the mechanical \"why\" behind database behavior. This first volume establishes the critical mental model required for all advanced performance tuning and architectural decision-making.

Why a Modular 5-Volume Series?

Traditional database books are often too shallow for experts or too academic for practitioners. By breaking this knowledge into five focused volumes, we allow you to:

Master one layer at a time: Focus deeply on foundations before moving to query optimization or high availability.
Just-in-time expertise: Buy only the volume you need for your current project or production bottleneck.
Stay current: Receive free updates as PostgreSQL 18 and future versions evolve.

What You Will Learn in Volume I

The Process Model: Why PostgreSQL uses processes instead of threads and how this impacts connection scaling.
Memory Architecture: Mastering the crucial split between shared_buffers and per-process memory like work_mem.
Physical Storage: How data lives in 8kB pages and how the system manages Free Space Maps (FSM) and Visibility Maps (VM).
MVCC Foundations: The engine behind multi-version concurrency and how snapshots provide isolation without locking readers.
PostgreSQL 18 Highlights: Get a first look at the new Asynchronous I/O (AIO) subsystem and how it overlaps disk I/O with computation.

Who This Book Is For

This series is written for database professionals who require an architectural understanding of the engine:

Database Administrators responsible for reliability and optimization.
Platform Engineers designing infrastructure at scale.
Senior Backend Developers needing to understand how code interacts with internals.
SREs troubleshooting complex performance stalls.

The Series Roadmap

Volume I: Foundations & Core Concepts (Available Now)
Volume II: Concurrency & Maintenance (Coming Soon)
Volume III: Query Execution & Optimization
Volume IV: Indexes & Advanced Topics
Volume V: Case Studies & Real Scenarios

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