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What separates the physical aspects of data storage from the logical aspects of data representation?
A schema separates the physical aspect of data storagefrom the logical aspects of data representation.
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.
What is raid volume?
A logical representation of one or more physical disks configured to provide redundant and/or large storage space for the system.
Does the network diagram usually refers to the physical layout of the network cable and devices?
No, a network diagram typically refers to a logical representation of a network, illustrating how devices and systems communicate with each other. It highlights the relationships and configurations among various components, such as routers, switches, and servers, rather than their physical layout. While a physical network diagram may depict the actual placement of cables and devices, the term "network diagram" generally encompasses both logical and sometimes physical aspects depending on the context.
What difference between logical and physical design?
Logical design refers to the abstract representation of the data and the relationships among data elements, focusing on how data is organized and accessed without considering the physical storage details. In contrast, physical design involves the actual implementation of the logical design, specifying how data will be stored on hardware, including file structures, indexing methods, and data storage formats. Essentially, logical design is about "what" data is needed and "how" it relates, while physical design deals with "where" and "how" that data is physically stored and retrieved.
A logical representation of where you store your files on a computer?
folder
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.
Difference between physical and logical DFD?
difference between physical and logical data flow diagrams.
The printer que is a representation fo the printer's input and output.?
logical
What is a logical representation of multiple hierarchical levels within a directory?
Tree
Can a single physical topology support multiple logical topology?
Yes, a physical topology can support multiple logical topologies.
What is difference between logical file and physical file?
* Physical file (PF) contains the data and have only one record format. Logical file (LF) is a view of the physical file which does not contain any data may be based on one physical file or more then one physical file. Logical file can have more then one record format. Logical can be non join or join logical file. Performance becomes better if you use the logical file in the program.
