which versions are you using (SonarQube, Scanner, Plugin, and any relevant extension)
Community 7.7
what are you trying to achieve
Trying to understand what is exactly meant by the warning that the default database is not scalable. Does it have size limitations? What limitations does it have?
First of all, if you use embedded database you won’t be able to upgrade the SonarQube server to a newer version. To use a newer version (like 7.8) you’ll lose everything and you’ll need to start from scratch. You also cannot move the data from it to a real database (PostgreSQL, Oracle, SQL Server…) later. The embedded database is designed for basic demos/testing.
For “real” instances, you should use a real database.