Question

What is data abstruction? Brieflywrite about different leve ofdata abstraction?

Answer 1

Hey, here's the answer :-

Abstraction refers to the act of representing essential features without including the background details.

The 3 levels of abstraction are as follows:

Physical level: The lowest level of abstraction describes how data are stored.

Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.

View Level: The highest level of abstraction describes only part of entire database

Answer 2

Answer:

Abstraction in general, is the process of taking away or removing characteristics from something in order to reduce it to a set of essential characteristics. As in abstract art, the representation is likely to be one potential abstraction of a number of possibilities. A database abstraction layer, for example, is one of a number of such possibilities.

Data abstraction is usually the first step in database design. A complete database is much too complex a system to be developed without first creating a simplified framework. Data abstraction makes it possible for the developer to start from essential elements -- data abstractions -- and incrementally add data detail to create the final system.

The are three levels of abstraction are as follows:

Physical level: The lowest level of abstraction describes how data are stored.

Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.

View level: The highest level of abstraction describes only part of entire database.