Database VS Data Structure

[olivthill2]

Sorry, I don't understand very well your question.

1. What do you mean by "data structure source code" and "database" ?

To me, a "database" is usely a word used by an analyst, and a "data structure source code" is an expression used by a programmer. Both things are almost the same, but they are used on different levels.

2. Your main criteria seems to be the speed of loading.
In the real world, who cares if a Select takes two miliseconds or two tenth of a second ?
You are neglecting other very important issues, such as readability, time to program, compatibility with several environments, etc.

3. You are talking about a global choice, but it is better to be pragmatic.
If your program is really too slow, then start to think about various solutions to improve the speed. But unless speed is really an issue, then you'd better spend your time finding bugs and adding new functions to your application.

4. It is a good question.
It seems you are a student and you don't agree with a professor. That's a good thing, because there are many professors who are wrong. You know the old saying, that those who know, are doing things, and those who don't know are teaching others how to do things.