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physical layer or application data access strategy running on the outer level will require a change because
they will not be able to correctly access the changed internal or physical levels. As a result, these applications will stop works and eventually the entire system may fail. Data independence achieved as a result of three levels architecture proves to be very useful because once we have data, databases and data applications independent of each other.
Can easily make changes to any part of the system, without affecting the functionality and operation of others
interrelated components. Data and program independence is an advantage of 3-L
Architecture another main advantage is that the ant changes in the lower level of the 3-L architecture does not affect the structure or functionality at higher levels. I-e we get external/conceptual and conceptual/internal independence at three levels Architecture.
Data independence can be divided into two types based on the level at which independence is obtained.
o Logical data independence o Physical independence of data Logical data independence Logical data independence provides independence in a way that changes in the conceptual model do not affect external views. Or it can simply be stated on the Immunity of the outer level from changes at the conceptual level.
MGT201 Short Notes for Final Term and Mid Term
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