I have done this for simple web apps in the past. And I have had programmers who used the resulting apps call me a liar and tell me it's not possible. The fil

I have done this for simple web apps in the past. And I have had programmers who used the resulting apps call me a liar and tell me it's not possible. The file system is itself a multi-user indexed data store built right into the OS kernel. However, it obviously is not a relational DBMS. So if your needs are limited and can be satisfied by a simple indexed data store, this can work remarkably well. Even though some "software engineers" will tell you it can't because they have been trained differently.