FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Which among the following is not a level of abstraction? Explanation: Abstraction is generally divided into 3 different levels, namely, logical, physical and view level. External level is not defined in terms of abstraction.

Detailed explanation-2: -However, the data abstraction level that describes how the data was actually stored in the user’s machine (or system) is known as the Physical level. Therefore the correct answer is B.

Detailed explanation-3: -Physical or Internal Level It is the lowest level of abstraction for DBMS which defines how the data is actually stored, it defines data-structures to store data and access methods used by the database.

Detailed explanation-4: -There are three levels of abstraction : Physical Level: Defines how the data is actually stored employing various data structures. Logical level: Describes the relationship which exists among the stored data. View level: Provides a high level view of a section of data.