An experimental, distributed database.

xdb is an experimental, distributed SQL database, written in Go.

The goal of this project is to build a database from scratch which is well documented, fully tested, and easy to understand. Implementing as much as possible from the ground up.

It is also currently a work in progress. Feel free to follow along with the development of each component, from parser to pager.

The database is made up of a few separate components. These handle the SQL parsing, the intermediary representation generation, the multi-node consensus, the execution of the IR, and the (persistent) storage.

For a brief overview of the purpose of each component, have a look at the overview.

Inspiration has been taken from the brilliantly documented codebase of SQLite. However the codebase has been heavily optimized, and is difficult to follow without spending significant time.

Work has also already been done to build a distributed version of SQLite called rqlite. The project uses raft consensus in order to keep nodes consistent across the network.

xdb doesn't aim to be nearly as performant as SQLite nor rqlite, and hopefully trades this instead for slightly more clarity and simplicity.

xdb originates from lbadd, but it was branched to follow slightly different goals. xdb will always be free to use and open source.

Contributors are more than welcome and much appreciated. Please feel free to open a PR to improve anything you don't like, or would like to add. No PR is too small! Go check out our contributing guide for more detailed info about how to get started with a contribution.

This project is licensed under the MIT license.