@NivethanI believe that is mostly in respect to the naming convention for Unity Catalog items themselves. The  names we use for UC items are entirely composed of lowercase letters and underscores in our setup. The database name with spaces in this case, is a source system. We have no control over the naming scheme of that database and it shouldn't matter as a regular JDBC connection works fine within Databricks. So I think you're mixing up two different things in your answer.