Re: bottom up model

From: Tobin Harris <>
Date: Fri, 11 Oct 2002 12:34:53 +0100
Message-ID: <ao6d1h$ingk5$>

"sophie" <> wrote in message news:3da4c762$

> hi,
> i need to find some infomation on bottom up modeling and dbms software
> slection.  can anyone point me in the right direction

Bottom up modelling usually entails trawling through existing systems and documents to find potential data required for a system. This can then be normalised into an ER model. Top down is usually gathered by talking to domain experts and deriving a model from the concepts they explain. It's usually a good idea to do each, because you're 2 models should validate each other. Searching for "bottom up ER modelling" on google might get you some interesting resources.

As for selecing a dmbs, look up "dmbs comparison" on google. I can't guarantee that you'll find what you're looking for, but this may help. In general, selecting a dmbs (relational?) will depend on many factors unique to the project. These might include:

  • Expected size/growth of data (in MB, or rows & tables)
  • Expected number of users
  • Expected Transactions executed per hour/second etc
  • Ineroperation with other pieces of software and systems
  • The need to distribute the data geographically
  • Project Budget
  • Staff Skills
  • Project Development Time
  • The companies alliances with other vendors

HTH Tobin Harris

Received on Fri Oct 11 2002 - 13:34:53 CEST

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