请用100字以内的文字简要说明逻辑数据流图(Logical Data Flow Diagram)和物理数据流图(Physical Data Flow Diagram)之间的主要差别。相关知识点: 试题来源: 解析 正确答案:这是一道要求读者掌握逻辑数据流图和物理数据流图区别点的简答题。本题所涉及的知识点如下。 ①数据流图是系统分析阶段用于描述系统逻辑模型的...
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...
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 didNOTrecord 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 alogicalDFD. ...
Data modeling is a technique to document a software system using entity relationship diagrams (ER Diagram) which is a representation of the data structures in a table for a company’s database. It is a very powerful expression of the company’s business
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。查看答案更多“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”相关的问题 第1题 阅读下列说明,回答问题1和问题2,将解答写在答卷的对应栏内。【说明】 ...
A ___ data flow diagram focuses on business events and the data they require and produce. logical physical detailed automated Worksheet PrintWorksheet 1. In a physical DFD, the processes shown represent: Personal computers Servers Routers Programs...
Google Share on Facebook Ethernet (redirected fromlogical vs. physical topology) Thesaurus Medical Encyclopedia Related to logical vs. physical topology:bus topology E·ther·net (ē′thər-nĕt′) A trademark for a LAN protocol. American Heritage® Dictionary of the English Language, Fifth ...
A single logical network diagram is often not enough to capture the complexity of your entire network, but sometimes you don’t have the time to perform constant scans. With NTM, you can use a single scan to create multiple maps with detailed graphics and statistics to help you drill down ...
It is also known as the entity–relationship (E–R) diagram. An entity can be called as a concept, a piece of data, or an object about which the data (and the relations surrounding the data) is stored. Object-relational Model We can think of the object-relational model as a ...