Introduction to Database System Entities use identifiers while tables use keys. False True False True ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System The activity of a file 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 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 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 ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System An audit trail All of the listed here is used to make back-up copies is the recorded history of operations performed on a file can be used to restore lost information All of the listed here is used to make back-up copies is the recorded history of operations performed on a file can be used to restore lost information ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System An entity is something that can be identified in the user's work environment; something that the users want to track. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System The data-base environment has all of the following components except: None of these data-base administrator users data base separate files None of these data-base administrator users data base separate files ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Two files may be joined into a third file if they have no records with the same value in the common field they have a field in common both (b) and (c) None of these they have a row in common they have no records with the same value in the common field they have a field in common both (b) and (c) None of these they have a row in common ANSWER DOWNLOAD EXAMIANS APP
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