Platform.sh supports both MariaDB and Oracle MySQL to manage your relational databases.
To add a database service:
1. The first step to adding a service is to add an entry to your .platform/services.yaml file, and configure the service's name and its parameters, such as the allocated storage size and version.
2. The second step is to then grant your app (or apps) access to the service by creating a relationship to the service.
For more information on this feature, please see the following page in the Platform.sh documentation: