COMPUTER APPLICATIONS
DATABASE MANAGEMENT SYSTEMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Physical Level
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Critical Level
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Logical Level
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View Level
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Detailed explanation-1: -14. 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: -Data abstraction means displaying or sharing only the data that is needed and hiding from all other data until it is necessary to share it. 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.
Detailed explanation-3: -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.