Contributed a review of MariaDB: Easy to use with a simple initial setup and a fast implementation

Contributed a review of MongoDB: Easy to implement and create a cluster, very stable, and very scalable

Contributed a review of MySQL: Easy to set up but the stability needs to be improved

Contributed a review of PostgreSQL: Easy to install, easy to manage, and free

Contributed a review of Oracle Database: Straightforward to install, stable, and scalable