Introduction to Database System
An-owner-member set in the CODASYL specifications may have

more than one member but only one occurrence per member
only one owner but many owner occurrences
All of the listed here
only one member but many member occurrence

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

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