History[02]

This DBMS was started by Marcelo Boeira in 2016 as a learning vehicle for understanding the development of NoSQL database systems, such as Redis. Originally written for Crystal, it has since been built out to additionally support Python, Ruby, and Elixir with help from Mauricio Antunes, Hugo Abonizio, and Vitalii Elenhaupt. Its last commit was made in early 2018, and Boeira has since archived the Github repository.

Checkpoints

Concurrency Control[03]

BoJack does not provide any kind of concurrency control. Concurrent client requests are handled by the Crystal language's concurrent Channel class, which is an abstraction of threads.

Data Model[01]

BoJack's data model relies on a key/value store which maps string keys to string array values.

Foreign Keys[01]

As BoJack is a key-value store, SQL joins are not supported.

Indexes

Joins

Logging[04]

Bojack logs, in addition to errors, individual commands for any client action, along with the date and time of interaction, and the client's address and port.

This includes anytime a client connects, or a key is set, updated, or deleted.

Query Compilation

Query Interface[05]

Bojack provides a standard command-line interface for starting the server and connecting clients.

Storage Architecture[06]

Storage Model[06]

BoJack uses Crystal's default in-memory hash table to store its data as key-value pairs.

Storage Organization

Stored Procedures

System Architecture

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