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21. Which of the following products was an early implementation of the relational model developed by E.F. Codd of IBM?
a. IDMS
b. DB2
c. dBase-II
d. R:base
Answer: (b).DB2

22. The following are components of a database except ________ .
a. user data
b. metadata
c. reports
d. indexes
Answer: (c).reports

23. An application where only one user accesses the database at a given time is an example of a(n) ________ .
a. single-user database application
b. multiuser database application
c. e-commerce database application
d. data mining database application
Answer: (a).single-user database application

24. An on-line commercial site such as Amazon.com is an example of a(n) ________ .
a. single-user database application
b. multiuser database application
c. e-commerce database application
d. data mining database application
Answer: (c).e-commerce database application

25. Which of the following products was the first to implement true relational algebra in a PC DBMS?
a. IDMS
b. Oracle
c. dBase-II
d. R:base
Answer: (d).R:base

26. Because it contains a description of its own structure, a database is considered to be ________ .
a. described
b. metadata compatible
c. self-describing
d. an application program
Answer: (c).self-describing

27. The following are functions of a DBMS except ________ .
a. creating and processing forms
b. creating databases
c. processing data
d. administrating databases
Answer: (a).creating and processing forms

28. Helping people keep track of things is the purpose of a(n) ________ .
a. database
b. table
c. instance
d. relationship
Answer: (a).database

29. Which of the following products implemented the CODASYL DBTG model?
a. IDMS
b. DB2
c. dBase-II
d. R:base
Answer: (a).IDMS

30. An Enterprise Resource Planning application is an example of a(n) ________ .
a. single-user database application
b. multiuser database application
c. e-commerce database application
d. data mining database application
Answer: (b).multiuser database application

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