Table of Contents
- 1 What is the difference between logical and physical data?
- 2 What are logical data independence and physical data independence What is the difference between them which of these harder to realize why?
- 3 What is the difference between logical and physical schema?
- 4 What is the meaning of physical logical?
- 5 What is the purpose of logical data independence?
- 6 What is logical data independence Mcq?
- 7 What does logical mean in information technology?
- 8 What is the difference between physical memory and logical memory?
- 9 What is the difference between logical and physical data independence?
- 10 What is the difference between conceptual mapping and physical data independence?
- 11 What is physical data independence in DBMS?
What is the difference between logical and physical data?
The main difference between Logical and Physical Data Model is that Logical data models help to define the data elements and their relationships, while the physical data models help to design the actual database based on the requirements gathered during the logical data modelling.
What are logical data independence and physical data independence What is the difference between them which of these harder to realize why?
The physical data independence is basically used to separate conceptual levels from the internal/physical levels….Difference between Physical and Logical Data Independence :
Physical Data Independence | Logical Data Independence |
---|---|
It is easy to retrieve. | It is difficult to retrieve because the data is mainly dependent on the logical structure of data. |
Why physical and logical data independence is important?
Physical data independence helps you to separate conceptual levels from the internal/physical levels. It allows you to provide a logical description of the database without the need to specify physical structures. Compared to Logical Independence, it is easy to achieve physical data independence.
What is the difference between logical and physical schema?
Physical schema represents the actual connection to the data source or data target. Logical schema represents the logical name associated to that source or target.
What is the meaning of physical logical?
Logical implies a higher view than the physical. Users relate to data logically by data element name; however, the actual fields of data are physically located in sectors on a disk. For example, to find out which customers ordered how many of a particular product, the logical view is customer name and quantity.
What is logical data model with example?
For example, a simple logical data model for a retail company can organize all necessary facts by store, product, and time, which are three common business perspectives typically associated with a retail business. Logical data models are independent of a physical data storage device.
What is the purpose of logical data independence?
Logical data independence is used to separate the external level from the conceptual view. If we do any changes in the conceptual view of the data, then the user view of the data would not be affected. Logical data independence occurs at the user interface level.
What is logical data independence Mcq?
Logical Data Independence: The ability to change the conceptual schema without having to change the view level schema. Physical Data Independence: The ability to change the internal schema without having to change the conceptual schema.
What is logical database?
Logical Database is an special ABAP program which retrieves data from various tables Which are interrelated and provides a read only view of the data. A Logical Database is a hierarchical structure of tables. Logical databases contain Open SQL statements that read data from the database.
What does logical mean in information technology?
(1) Refers to a user’s view of the way data or systems are organized. For example, a logical description of a file is that it is a collection of data stored together. This is the way files appear to users.
What is the difference between physical memory and logical memory?
Physical memory is RAM; Actually belongs to main memory. Logical address is the address generated by CPU. In paging,logical address is mapped into physical address with the help of page tables.
What is physical data representation?
A physical data model (or database design) is a representation of a data design as implemented, or intended to be implemented, in a database management system. Analysts can usually use a physical data model to calculate storage estimates; it may include specific storage allocation details for a given database system.
What is the difference between logical and physical data independence?
It is difficult to retrieve because the data is mainly dependent on the logical structure of data. As compared to the logical independence it is easy to achieve physical data independence. As compared to the physical independence it is not easy to achieve logical data independence.
What is the difference between conceptual mapping and physical data independence?
Any change done would be absorbed by the mapping between the conceptual and internal levels. Physical data independence is achieved by the presence of the internal level of the database and then the transformation from the conceptual level of the database to the internal level.
What is the difference between logical data model and physical data model?
Another difference between logical and physical data model is that the logical data models define the data elements and their relationships, while the physical data models allow developing the actual database.
What is physical data independence in DBMS?
Relations stored as unordered files. Index on the first column of Students. Physical data independence helps you to separate conceptual levels from the internal/physical levels. It allows you to provide a logical description of the database without the need to specify physical structures.
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