DBMS-Database System Architecture
DBMS-Database System Architecture
11. The primary difference between the different data models lies in the methods of expressing relationships and constraints among the data elements.
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12. In a database, the data are stored in such a fashion that they are independent of the program of users using the data.
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14. The physical schema is concerned with exploiting the data structure offered by a DBMS in order to make the scheme understandable to the computer
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15. The logical schema, deals with the manner in which the conceptual database shall get represented in the computer as a stored database.
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16. Subschemas act as a unit for enforcing controlled access to the database.
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17. The process of transforming requests and results between three levels are called mappings.
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18. The conceptual/internal mapping defines the correspondence between the conceptual view and the stored database.
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19. The external/conceptual mapping defines the correspondence between a particular external view and organisation
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20. A data model is an abstraction process that concentrates essential and inherent aspects of the organization's application while ignores supefluous or accidental details.
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