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#Structural & #DataDependence #cs403
Structural Dependence.
Access to file is dependent on structure i.e. change in any structure will result into dependent/relying programs. It is because all programs are affected by changes and they exhibit structural dependence.
Structural Independence
When your programs are not affected by any structural change.
Data Dependence
When your programs are affected by any change in characteristics/attributes (Meta Data) of data.
Data Independence
⮚ When your program’s ability to access data is not affected by any change in file structure.
⮚ Logical Data Format: How Human Views Data.
⮚ Physical Data Format: How computer processes data.
⮚ Computer programmers & database specialist know the problems while they deal such file structures.