0. Introduction and overview

Introduction

Database systems are fundamental components of modern software applications, serving as the backbone for storing, retrieving, and managing vast amounts of data. Understanding the internal workings of databases is crucial for developers, system architects, and database administrators to design efficient, scalable, and reliable systems.

This section provides an overview of database internals, covering key concepts and components that form the foundation of database management systems. We'll explore:

1. Storage Engines: The mechanisms used to store and retrieve data from disk or memory.

2. Indexing Structures: Various techniques for organizing data to enable fast lookups and queries.

3. Query Processing: How databases interpret, optimize, and execute user queries.

4. Transaction Management: Ensuring data consistency and integrity in multi-user environments.

5. Concurrency Control: Managing simultaneous access to shared data resources.

6. Recovery Mechanisms: Strategies for handling system failures and maintaining data durability.

By delving into these topics, we aim to provide a comprehensive understanding of the intricate systems that power modern databases, enabling readers to make informed decisions when designing, implementing, and maintaining database-driven applications.