Mysql ?

MySQL is an Oracle-backed open source relational database management system (RDBMS) based on Structured Query Language (SQL). MySQL runs on virtually all platforms, including Linux, UNIX and Windows. Although it can be used in a wide range of applications, MySQL is most often associated with web applications and online publishing.

Use Mysql with a Ruby on Rails application

Ensure the MySQL gem is defined in your Gemfile

gem ‘mysql2’

and bundle install

Create a new MySQL database for a Rails application