What do you know about three levels of data abstraction?



Suraj Said

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The three levels of data abstraction in a database management system (DBMS) are the physical level, the logical level, and the view level.
The physical level (also known as the internal level) deals with the physical storage of data on a storage device such as a hard drive. It deals with the lowest-level details of how data is stored, including the specific file structure, access methods, and storage devices used. The user does not interact directly with the physical level, but rather interacts with the higher levels of abstraction.
logical level (also known as the conceptual level) deals with the logical organization of data. It defines the overall structure of the database and the relationships between the different data elements. The logical level is independent of the physical implementation and is the main point of interaction for the user.
view level (also known as the external level) provides the user with a specific view of the data in the database. Users may have different views of the same data, and the view level allows the user to access only the data that is relevant to them. The view level also provides a level of security, as it can be used to restrict access to specific parts of the database.



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