Cs403 Assignment 2 Solution Spring 2022

These models are records based and are not in similarity to those of semantic data models. These models handle the data at almost all the three levels of the three layers of the database architecture. Semantic data models are generally used for designing the logical or conceptual model of the database system, once very common example of the semantic data model is ER-Data Model which is very much popular for designing databases. No DBMS is based on ER Data model because it is purely used for designing whereas a number of DBMS are available based on the OO data model, network data model, relational data model l, and hierarchical data model.

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By separating the three design levels we get the benefit of abstraction on the one hand whereas, on the other hand, we can create our logical and conceptual designs using better design tools, which would have not been possible if we are using the same design tool for all the three levels. Moreover if in the future there is a need to make a change in the physical implementation of the data we will have to make no changes in the logical or conceptual level of the database design, rather the change can be achieved by only using the existing conceptual model and implementing it again on Physical model using a separate DBMS. CS403 Assignment 2 Solution Spring 2022.

As has been mentioned before that the term entity is used for all of the three terms mentioned above, and it is not wrong. Most of the time it is used to mention an entity type, next it is used for an entity instance and least times for an entity set. We will be precise most of the time, but if otherwise, you can judge the particular meaning from the context.

Cs403 Assignment 2 Solution Spring 2022, cs403 assignment 2 solution 2022, cs403 assignment 2 solution.

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