Masterdata - when to use it and when not to use it

Hi!
I have had some discussion with my colleagues about the use of masterdata on Oracle databases. Some of them tells me that I should use it if the data don't change often (ofcourse.....). This should ALWAYS be done they say. But I don't agree on this..
Is it really necessary to make a lot of masterdata (and also views that has to be used) if the data is only to be loaded once a day, and the number of records is max 1000?
I can't see the effect on this...
Can someone give me a guideline for when to use masterdata, and when I don't need to use masterdata (if there are any article on this, please give it to me).
Best Regards
Helge

Hi
Answering this question usually requires a few books, so, I'm sorry, it's not really as simple as choosing between using a screwdriver vs. a hammer.
But, very short, inheritance should ideally only be used when there exist a strict 'is-a' relationship. However, sometimes it may be clever to inherit when you have a 'is-almost-a' relationship... And sometimes this is a stupid move. This depends on the context/circumstances.
Aggregation is normally considered a 'has-a' relationship, thereby differing clearly from inheritance. The old 'car' model says "a car is-a vehicle and has-some (at least) wheels."
The wheels are aggregated to the car class, that itself is inherited from vehicle.
However, this is just a good rule-of-thumb and there may be circumstantial reasons for not following these guidelines.

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