Describe the three levels of data abstraction, Operating System

There are three kinds of Data Abstraction:

  • Physical level: The minimum level of abstraction defines how data are saved.
  • Logical level: The next bigger level of abstraction, defines what data are saved in database and what relationship among those data.
  • View level: The biggest level of abstraction defines only part of whole database

 

1217_Data Abstraction.png

Posted Date: 7/30/2012 1:28:24 AM | Location : United States







Related Discussions:- Describe the three levels of data abstraction, Assignment Help, Ask Question on Describe the three levels of data abstraction, Get Answer, Expert's Help, Describe the three levels of data abstraction Discussions

Write discussion on Describe the three levels of data abstraction
Your posts are moderated
Related Questions
Question 1 Explain single Partition Allocation and Multiple Partition Question 2 What is PCB? What useful information is available in PCB? Question 3 Explain Preemptive and No

What is the benefits OS co-operating process? Information sharing. Computation speeds up. Modularity. Convenience.

Explain the Types of System Calls The major types of system calls are like this: a. Process Control: These types of system calls are employed to control the processes.

Why is it not possible to enforce memory protection at compile time?   Every process should be protected against unwanted interference by other process, whether intentional or

Q. What is the major advantage of the layered approach to system design? What are the de-merits of using the layered approach? Answer: As in all cases of modular design as well

Explain about threading issues? The fork and exec system calls In a multithreaded program of few UNIX systems have chosen to have two versions of fork, one that duplicates e

Q. How Program execute in operating system? Program execution- The operating system fills the contents (or sections) of a file into memory as well as begins its execution. A us

What is a multiprocessing system? Multiprocessor systems are those systems that use additional than a single processor for program execution. It is done for raising the executi

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Explain the Request or Response interface The Request/Response interface is ideal for a message based client-server interaction. By modeling components to interact via a reque