Introduction to Database System The activity of a file is a low percentages of number of records added or deleted from a file if high, reduces processing efficiency for sequential and nonsequential files None of these is a measure of the percentage of existing records updated during a run 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 None of these is a measure of the percentage of existing records updated during a run refers to how closely the files fits into the allocated ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A functional dependency is always an equation. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Large collections of files are called records None of these fields databases file system records None of these fields databases file system ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Data encryption techniques are particularly useful for protecting data in data communication systems reducing storage space requirements improving data integrity All of these None of these protecting data in data communication systems reducing storage space requirements improving data integrity All of these None of these ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Which of the following refers to something that can be identified in the user's work environment, something that the users want to track? Identifier Entity Relationship Attribute Identifier Entity Relationship Attribute ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System The functional dependency R → S means that the value of S can be determined when we are given a value of R. True False True False ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS