Introduction to Database System
Which of the following is true of a network structure?

It is a physical representation of the data
It is conceptually simple
It will be the dominant data base of the future
It allows a many-to-many relationship

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Introduction to Database System
The activity of a file

is a measure of the percentage of existing records updated during a run
None of these
refers to how closely the files fits into the allocated
is a low percentages of number of records added or deleted from a file
if high, reduces processing efficiency for sequential and nonsequential files

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