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
Long term scheduler calculates which processes are admitted to the machine for processing. It accepts the degree of multiprogramming. Once accepted, a job converts a process.

Describe the internal layout of the file system in windows 2000. The basic entity in NTFS is a volume and a volume is created by the Windows 2000 disk administrator utility and

FIXED PARTITIONING Using fixed partitioning we are able to allocate the memory Here we are dividing the memory into a few fixed partitions.Every partition may not be of the si

Operating Systems have evolved tremendously in the last few decades. The first approach for building Operating Systems, taken during the 40s through early 60s, was to allow only on

THE PROGRAM WILL CHOOSE TWO RANDOM NUMBERS,THEN PRINT THEM OUT AS AN ADDITION PROBLEM.THE PROGRAM WILL THEN ASK THE USERTO ENTER THE CORRECT ANSWER.IF THE ANSWER IS CORRECT,THE PRO

explain about design issues of network operating system

UNIX Shell and History feature. 1.Creating a child process. 2.Creating a history feature. Its exactly "programming project 1 - Unix Shell and History Feature (p.157-159)" in the Si

Define properties of Real time operating system Real time :- Often used in a dedicated application, this system reads information from sensors and must respond within a fixed a

Q. Compare the utilization of networking sockets with the use of shared memory as a mechanism for communicating data between processes on a single computer. What are the merits of

List disadvantages of using a single directory. Users have no privacy. Users must be careful in choosing file names, to avoid names used by others. Users may destroy each othe