1.

State the various levels of data abstraction in Database Management Systems.

Answer»

In Database Management Systems, there are three basic levels of data ABSTRACTION. They are as follows:

  • Physical Level: The physical level of abstraction specifies how data is stored and is the lowest DEGREE of abstraction.
  • Logical or CONCEPTUAL Level: After the Physical level, there is the Logical level of abstraction. This layer decides what data is saved in the database and how the data pieces relate to ONE another.
  • View Level: The greatest level of abstraction, the View Level describes only a PORTION of the entire database.


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