Exercise: Database Systems

Questions for: Database Systems

The files stored on a secondary stage device are composed of a hierarchy of data. What does a record in a file contain?
A:
Bits
B:
Characters
C:
Data field
D:
Schema
Answer: C
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The relational model uses some unfamiliar terminology. A tuple is equivalent to a:
A:
record
B:
field
C:
file
D:
data base
Answer: A
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If the record management system allows you to edit values before they are recorded on disk, you can
A:
correct spelling changes before they are recorded
B:
change the name of a field
C:
change the width of a field
D:
All of the above
Answer: A
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In SQL, which command(s) is(are) used to enable/disable a database trigger?
A:
MODIFY USER
B:
CHANGE USER
C:
ALTER TRIGGER
D:
All of the above
Answer: C
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The data dictionary tells the DBMS
A:
what files are in the database
B:
what attribute are possessed by the data
C:
what these files contain
D:
All of the above
Answer: D
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