Introduction to Database System
A database management system

None of the listed here
allows simultaneous access to multiple files
Both of the listed here
can do more than a record management system

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Introduction to Database System
The activity of a file

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

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