Re: definitions for conceptual, logical, physical
Date: Sat, 24 Jun 2006 13:08:03 -0600
"Marshall" <marshall.spight_at_gmail.com> wrote in message news:1151082515.490597.297470_at_i40g2000cwc.googlegroups.com...
> Hi all,
> We use these terms a lot: conceptual, logical, physical.
> I believe I have a good intuitive understanding of these
> terms and how they are used. However, an intuitive
> understanding and a formal definition are not the same
> Anyone have formal definitions for the above terms?
This is far from formal.
Probably just a rehash of what you already know. This is my take.
Conceptual design follows requirements gathering.
Conceptual design models the problem space as the user sees the problem. So all of the terms in this model are terms that the user understands and uses to describe their world.
Make a choice as to how you are going to organize the data: relational, network, hierarchical, flat file, whatever. Map the conceptual model to your choice a logical model using whatever methods that model provides. This model uses language that is independent of any specific implementation.
Map the logical design to the implementation details of the chosen logical model. If you model the data relationally, then you would at this point pick a specific dbms, Oracle, MSSQL, MySQL, etc., but your logical design would map to any dbms.
----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- Received on Sat Jun 24 2006 - 21:08:03 CEST