Please provide a short (approximately 100 word) summary of the following web Content, written in the voice of the original author. If there is anything controversial please highlight the controversy. If there is something surprising, unique, or clever, please highlight that as well. Content: Title: Build Your Own Database from Scratch Site: Introduction Databases are not black boxes. Understand them by building your own from scratch! This book contains a walk-through of a minimal persistent database implementation. The implementation is incremental. We start with a B-Tree, then add a new concept with each chapter, and eventually go from a simple KV to a mini relational DB. Although the book is short and the implementation is minimal, it aims to cover three important topics: Persistence. How not to lose or corrupt your data. Recovering from a crash. Indexing. Efficiently querying and manipulating your data. (B-tree). Concurrency. How to handle multiple (large number of) clients. And transactions. Contents Part I: Simple KV Store (Completed) Introduction Files vs Databases Indexing B-Tree: The Ideas B-Tree: The Practice (Part I) B-Tree: The Practice (Part II) Persist to Disk Free List: Reusing Pages Part II: Mini Relational DB (Work in Progress) Rows and Columns Range Query Secondary Index Transactions Concurrent Readers and Writers Query Language Work in Progress… Subscribe to be notified of new chapters and print releases. [🔔 Subscribe] Pre-order the ebook via Leanpub. [🙂 Pre-Order] See also: offers “Build Your Own X” courses in many programming languages. Including Redis, Git, SQLite, Docker, and more. Check it out