Реферат тақырыбы: The conceptual, logical and physical data models
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| Disadvantages of Data model:
To develop Data model one should know physical data stored characteristics. This is a navigational system produces complex application development, management. Thus, it requires a knowledge of the biographical truth. Even smaller change made in structure require modification in the entire application. There is no set data manipulation language in DBMS. Conclusion Data modeling is the process of developing data model for the data to be stored in a Database. Data Models ensure consistency in naming conventions, default values, semantics, security while ensuring quality of the data. Data Model structure helps to define the relational tables, primary and foreign keys and stored procedures. There are three types of conceptual, logical, and physical. The main aim of conceptual model is to establish the entities, their attributes, and their relationships. Logical data model defines the structure of the data elements and set the relationships between them. A Physical Data Model describes the database specific implementation of the data model. The main goal of a designing data model is to make certain that data objects offered by the functional team are represented accurately. The biggest drawback is that even smaller change made in structure require modification in the entire application. Reading this Data Modeling tutorial, you will learn from the basic concepts such as What is Data Model? Introduction to different types of Data Model, advantages, disadvantages, and data model example. жүктеу/скачать 23.78 Kb. Достарыңызбен бөлісу:
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