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2.5 What is the difference between logical data independence and physical data independence?
Wiki User
∙ 13y ago
The logical data independence is the ability to modify a logical schema without making external view or application program change.
The physical data independence is the ability to modify a physical schema without making external view or application prrogram change.
Wiki User
∙ 13y ago
Logical data independence refers to the ability to change the conceptual schema without affecting the external schema or application programs. Physical data independence, on the other hand, refers to the ability to change the physical schema without affecting the conceptual schema. This allows changes in the storage structure or access methods without changing how data is viewed or accessed by applications.
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Is it harder to achieve logical data independence or physical data independence?
It is generally considered more difficult to achieve logical data independence compared to physical data independence. Logical data independence involves separating the conceptual structure of the data from the physical storage aspects, which can be complex depending on the database design. Physical data independence primarily deals with shielding the application from changes in the storage structure, which is usually more straightforward to achieve.
What is the difference between network architecture and network topology?
Network architecture refers to the design and structure of a network, including components, protocols, and technologies used for communication. Network topology, on the other hand, refers to the physical or logical layout of devices and how they are connected in a network, such as bus, star, ring, or mesh. In essence, network architecture defines how components work together, while network topology defines how components are arranged.
Why logical data independence is more difficult than physical data independence?
Logical data independence is considered more difficult than physical data independence because it involves changes to the conceptual schema and external schema, which are more closely tied to the way data is organized and viewed in the application. Physical data independence, on the other hand, deals with changes to the internal schema, which is more abstract and can be modified with less impact on the overall system.
What do you mean by data independence?
Data independence refers to the ability to make changes in the database structure without affecting the applications that use the data. It is achieved through different levels: physical, logical, and view-level independence. This helps in isolating the applications from underlying changes, providing flexibility and reducing dependency.
Is a logical unit of data and is a physical unit of data?
A logical unit of data is a virtual representation of data while a physical unit of data is the actual storage of data on a physical device. The logical unit of data is how data is organized and manipulated from a software perspective, while the physical unit of data is how data is stored on hardware such as disks or memory.
Difference between physical and logical DFD?
difference between physical and logical data flow diagrams.
Which one between logical and physical data independent is harder to achieve and why?
the logical data independence is hard to achieve because all the manipulation is belonging in logical data independence but in physical data independence only show the physical view .
What is the difference between network architecture and network topology?
Network architecture refers to the design and structure of a network, including components, protocols, and technologies used for communication. Network topology, on the other hand, refers to the physical or logical layout of devices and how they are connected in a network, such as bus, star, ring, or mesh. In essence, network architecture defines how components work together, while network topology defines how components are arranged.
Why logical data independence is more difficult than physical data independence?
Logical data independence is considered more difficult than physical data independence because it involves changes to the conceptual schema and external schema, which are more closely tied to the way data is organized and viewed in the application. Physical data independence, on the other hand, deals with changes to the internal schema, which is more abstract and can be modified with less impact on the overall system.
What Logical data independence and physical data?
what is physical datd independence
What are the difference between logical and physical tag?
While physical tags are also referred to as presentational mark-up, logical tags are useless for appearances. Physical tags are newer versions while logical tags are old and concentrate on content.
What is the difference between physical and logical topology?
Physical topology are says how the wire are interconnected, while Logical topology is how the network behaves and interoperates.Sk wasim ul HaqueKharagpur, Madpur
What is the difference between physical structure and logical structure of a disk?
well of course one is logical and the other is physical. but one involves the brain while the other has to do with your body or movement
Difference between logical database and physical database?
The logical database is how the data is percieved in the tables, the way the data is actually stored on the storage medium is the physical view of the database.
What is difference between physical data flow diagram and logical data flow diagram?
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How it is related to data independence?
Hi, Data Independence refers to the immunity of user application to make changes in the definition and organization of Data. There are three types of Data Independence - 1. Logical Data Independence - The ability to change the logical (conceptual) schema without changing the External schema (User View) is called logical data independence. 2. Physical Data Independence - The ability to change the physical schema without changing the logical schema is called physical data independence. 3. View Data Independence - always independent,no effect.
What is the difference between virtual logical and physical address spaces?
The concept of a logical address space is simply involved the process of mapping the Logical addresses to their Physical Addresses . Logical addresses are generated by the CPU; also referred to as virtual addresses.while Physical Address is the actual address of the data stored on the physical device and mapped by MMU.
