请说明逻辑数据流图(Logical Data Flow Diagram)和物理数据流图(Physical DataFlow Diagram)之间的主要区别。相关知识点: 试题来源: 解析 正确答案:物理数据流图关注的是系统中的物理实体,以及一些具体的文档、报告和其他输入/输出硬拷贝。物理数据流图用做系统构造和实现的技术性蓝图。逻辑数据流图强调参与者所做的...
[问题4] 试说明逻辑数据流图(logical data flow diagram)和物理数据流图(physical data flow diagram)之间的主要差别。 (分数:4.00) ___相关知识点: 试题来源: 解析 正确答案:() 解析:物理数据流图关注的是系统中的物理实体,以及一些具体的文档、报告和其他输入输出硬拷贝。物理数据流图用...
A logical DFD focuses on the business and business activities, while a physical DFD looks at how a system is implemented. So while any data flow diagram maps out the flow of information for a process or system, the logical diagram provides the “what” and the physical provides the “how....
Summary Logical vs Physical DFD Note that the Context Diagram did NOT record the movement of merchandise, but rather the information flow surrounding the underlying business processes. Let's summarize their differences: A DFD that shows the movement of information is called a logical DFD. A DFD ...
A closeup of an E/R diagram. Source: https://gistbok.ucgis.org/bok-topics/physical-data-models. Logical data models use ERDs to represent data entities and relationships, while physical data models define the actual tables, columns, and constraints in the DBMS. Data Normalization vs. Denormal...
Related to logical vs. physical topology:bus topology E·ther·net (ē′thər-nĕt′) AtrademarkforaLANprotocol. AmericanHeritage®DictionaryoftheEnglishLanguage,FifthEdition.Copyright©2016byHoughtonMifflinHarcourtPublishingCompany.PublishedbyHoughtonMifflinHarcourtPublishingCompany.Allrightsreserved. ...
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An example of a conceptual data model is an entity-relationship diagram (ERD) that outlines high-level entities like “Customer,”“Order,” and “Product” without technical details. A logical data model adds more structure, such as defining attributes like “CustomerID” and “OrderDate,” an...
The logical model defines how the model should be implemented. It broadly includes all kinds of data that need to be captured such as tables, columns, etc. This model is generally designed by Business Analysts and Data Architects. Physical Model The physical model defines how to implement a da...
4.Side by Side Comparison – Logical Address vs Physical Address in Tabular Form 5.Summary What is Logical Address? CPU generates logical address. From the perspective of a program that is running, an item seems to be located at the address provided by the logical address. Application programs...