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Data Model in DBMS




Data Model in DBMS

A model is an abstraction process that represent essential features without including the background details or explanations. It hides superfluous details while highlighting details pertinent to the application at hand. A data model is a mechanism that provides this abstraction for database applications. Data modelling is used for representing entities of  interest and their relationships in the data base. A data model defines the logical structure of a data base means that how data is connected to each other and how they are processed and stored inside a system.
data model in DBMS

https://en.wikipedia.org/wiki/Data_model#/media/File:Data_modeling_context.svg

A number of models for representing data have been developed. As with programming languages, there is no best choice for all applications but the models maintains the integrity of the by enforcing a set of constraints. Data models differ in their method of representing the associations amongst entities and attributes. The main models or approach are: Click on these models to know more .

Data Model Structure and Constraints -

Data Model Operations -

These operations are used for specifying database retrievals and updates by referring to constructs of the data model. The Operations may include basic model operations as well as user defined operations. Basic Model Operations : User Defined Operations Example : The hierarchical model is the oldest DBMS model and the object oriented DBMS being the newest data model.
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Identifying and Non Identifying Relationships Hierarchical Model

 

 


Post date: 2015-07-30 09:33:30
Post date GMT: 2015-07-30 09:33:30
Post modified date: 2015-12-16 12:58:36
Post modified date GMT: 2015-12-16 12:58:36

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