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The "Build Your Own Database" book is finished

James Smith

2023-04-20

01. Why Database?

Databases are a fascinating topic. They are a foundation of modern
computing. Learning how they work should be an important part of
software engineering education.

As many of today's (2023+) coders do not have a formal CS/SE
education, basic things such as databases, compilers, operating
systems, etc. are often seen as magical black boxes. That's why I
started the "Build Your Own X" book series. To learn and teach the
basics in a "from scratch" approach, through succinct & condensed
books.

There are some important topics that we can learn from database
systems:

 1. Persistence. How not to lose or corrupt your data. Recovering
    from a crash.
 2. Indexing. Efficiently querying and manipulating your data.
    (B-tree).
 3. Concurrency. How to handle multiple (large number of) clients.
    And transactions.

02. The Book

As with my other books, this book follows the step-by-step approach
while covering the 3 topics above. We start from a B-tree, then to a
KV store, finally to a mini database with a SQL-like query language.

The book is divided into 2 parts. Part I implements a KV store. Part
II implements a mini database and a query language based on the KV
store from Part I.

Part I is self-contained and can be used as a standalone book for
persistent KV stores, it is also freely available online.

The whole book is available as paperback or ebook.

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             * Persistence.
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