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what is Data Independence ?
Data Independence A major objective for the three-level architecture is to provide data independence, which means that upper levels are unaffected by changes to lower levels. There are two kinds of data independence: Logical Data Independence: The immunity of the external schema to changes in theRead more
Data Independence
A major objective for the three-level architecture is to provide data independence, which means that upper levels are unaffected by changes to lower levels.
There are two kinds of data independence:
Logical Data Independence: The immunity of the external schema to changes in the conceptual schema
Physical Data Independence: The immunity of the conceptual schema to changes in the internal schema
See lesswhat is Three-Level Architecture?
Three-Level Architecture:- External Level: The users’ view of the database describes that part of the database that is relevant to each user Conceptual Level: The logical view of the database describes what data is stored in the database and the relationships among the data. Internal Level: ThRead more
Three-Level Architecture:-
External Level: The users’ view of the database describes that part of the database that is relevant to each user
Conceptual Level: The logical view of the database describes what data is stored in the database and the relationships among the data.
Internal Level: The physical representation of the database on the computer describes how the data is stored in the database
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