Fichas
Data Modeler
Fichas del conjunto (4)
- 1What are Data Modeler Tools?Oracle data modeller tools aided in the design process by simplifying the identification of key processes. Specifically the implementation and mapping of entities. Creating entities and attributes is simplified in Data Modeler, naming them too is a simple process. The modelling tools available in Oracle Data Modeler helped in the overall design process and produced good and generally error free code.
- 2Modeler Aesthetics.According to Hay (1998) modellers differ in their approach to how they display notations. Some use over complicated and sometimes unreadable diagrams while others concentrate overly on aesthetics. Oracle Data Modeler uses a simple design paradigm utilising simple rounded boxes to represent entities. UML diagrams generally use more symbols which in my opinion can lead to over complicated diagrams.
- 3Modeler OrderThe order in which the entities are displayed is important in trying to understand an ER diagram. Hay (1998) states that automated tools usually place entities randomly without any rational to positions on the diagram. Although Oracle Data Modeler worked well producing the conceptual model, when the design was engineered to the logical model the position of entities was not always accurately engineered.
- 4Symbols and TypesHay (1998) asserts that the appearance of any model can be improved by minimising the use of symbols and figures. The diagrams produced using Oracle Data Modeler used a minimum number of symbols to represent entities, relationships and inheritance concepts. Hay (1998) continues saying that attributes should only be displayed if necessary. Oracle Data Modeler uses the hash charchter to display the primary key which follows the principles of simplicity laid out by Hay (1998). I believe for these reasons the diagrams produced resulted in cohesive and logical diagrams which accurately reflected the Branson Railways case study.
Información
- Descripción
- Database Design Fichas sobre Data Modeler, creado por adamelvin786 el 21/01/2015.
- Creado por
- adamelvin786
- Visitas
- 2
- Valoración