At what point is it worth using a database?

Question

I have a question relating to databases and at what point is worth diving into one. I am primarily an embedded engineer, but I am writing an application using Qt to interfa

Answer 1

When you have a lot of data that you're not sure how they will be exploited in the future.

For example you might want to add an SQLite database in an embedded application that need to register statistics that you're not sure how will be used. Later you send the full database for injection in a bigger one running on a central server and those data can easily be exploited, using requests.

In fact, if your application's purpose is to "gather data" then having a database is a must have.