Database
There are two database varieties available for GitLab: PostgreSQL and MySQL/MariaDB. The use of the latter is not recommended because the fast development of iterations of GitLab, as a product, have focused primarily on PostgreSQL, meaning that a number of optimizations are not available on MySQL. Furthermore, the zero-downtime method is not available when using MySQL, and neither are features such as subgroups and GEO, which will be explained later in this book.
As explained earlier, Ruby on Rails uses a so-called MVC approach. MVC is a well known architectural pattern that was developed by Trygve Reenskaug in the Smalltalk language. It was later enhanced for web applications (Model 2). The model in MVC is implemented by the ActiveRecord ...
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