Question

Identify the correct statement a) Logical level Abstraction: hide details of data types. b) Logical level Abstraction: describes how schema is stored in a data base. c) Logical level Abstraction: describes how a record is stored. d) Logical level Abstraction: describes accessibility of the database by an individual user

Answer 1

Data base abstraction has three levels.

Physical level abstraction describes how data is stored in database.

Logical level abstraction describes what data is stored along with data types and their relationship with other data.

View level abstraction describes the user interaction with database and hides the details of data types.

None of the given options are best described for a logical level abstraction.

Logical level abstraction shows data types, does not show how record is stored but shows what data is stored. Accessibility of database with user is actually in the view level.

Answer 2

The given options are not suited for a logical level abstraction.

Explanation:

• The logical level abstraction describes the structure of the whole 'database' for the community of users. This schema masks knowledge about physical storage systems and focuses on the definition of data types, objects, relationships, etc.
• This logical level comes between the user level and physical storage view. However, there is only a single conceptual view of a single database. At the logical level, the data available to the user must be stored in or extracted from the physical level.

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