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Test Bank

Chapter Nine (Database Systems)

Multiple Choice Questions

1. Which of the following accesses a database in terms of a database

model?

A. Application software

B. Database management system

C. Actual database

ANSW!"

A

#. Which of the following describes only the portion of a database a$

ailable to a particular user?

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A. Database model

B. Schema

C. Subschema

D. DB%S

ANSW!"

C

&. Which of the following relational operations combine data from mo

re than one relation?

A. S'C(

B. )!*+C(

C. +*,N

ANSW!"

C

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-. Which of the following relational operations etracts entire column

s from a relation?

A. S'C(

B. )!*+C(

C. +*,N

ANSW!"

B

/. Which of the following relational operations etracts entire rows fr

om a relation?

A. S'C(

B. )!*+C(

C. +*,N

ANSW!"

A

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0. Which of the following relational operations is performed by the S

' statement below?

select A2 B2 C

from 3

A. S'C(

B. )!*+C(

C. +*,N

ANSW!"

B

4. 5i$en the relation 3 below

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3"

A

B

C

#

/

4

&

&

&

-

&

#

/

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#

6

what $alue will be etracted by the following 7uery?

(%)

S'C( from 3 where B 8 C

!S9'(

)!*+C( A from (%)

A.

#

B.

&

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C.

-

D.

/

ANSW!"

C

6. 5i$en the relation 3 below

3"

A

B

C

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#

/

4

&

&

&

-

-

#

/

#

6

what $alue will be retrie$ed by the following 7uery?

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(%)

S'C( from 3 where B : C

!S9'(

)!*+C( B from (%)

A.

#

B.

&

C.

-

D.

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/

ANSW!"

B

;. 5i$en the relation below

3"

A

B

C

#

/

4

&

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&

0

-

-

#

/

#

#

what $alues will be retrie$ed by the following S' statement?

select A2 B

from 3

where 3.B : 3.C

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A. #2 /

B. &2 0

C. #2 #

D. /2 #

ANSW!"

D

1

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A. 'ost update problem

B. Clustering

C. Deadloc@

D. ,ncorrect summary problem

ANSW!"

B

1#. Which of the following features within a DB%S is not pro$ided to

maintain database integrity?

A. Concurrent transaction processing

B. 'og

C. 'oc@ing protocol

D. Commit points

ANSW!"

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A

1&. Which of the following data mining techni7ues would be applied w

hen trying to identify traits that

characteri>e the citi>ens of a democracy who fail to $ote?

A. Class description

B. Class discrimination

C. Cluster analysis

D. Association analysis

ANSW!"

A

1-. Which of the following data mining techni7ues would be applied w

hen trying to identify traits that

predict whether a citi>en in a democracy will or will not $ote?

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A. Class description

B. Class discrimination

C. Cluster analysis

D. Association analysis

ANSW!"

B

1/. Which of the following data mining techni7ues would be applied w

hen trying to identify any

underlying heterogeneity within housing patterns in a community?

A. Class description

B. Class discrimination

C. Cluster analysis

D. Association analysis

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ANSW!"

C

10. Which of the following data mining techni7ues would be applied w

hen trying to identify common

properties between dierent groups of shoppers?

A. Class description

B. Class discrimination

C. Cluster analysis

D. Association analysis

ANSW!"

D

14. Which of the following le structures is most ecient in cases in w

hich the le is always

processed in its entirety a predetermined order?

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A. Se7uential

B. ,ndeed

C. ash

ANSW!"

A

16. Which of the following le structures is commonly used for the st

orage of tet les?

A. Se7uential

B. ,ndeed

C. ash

ANSW!"

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A

1;. Which of the following le structures is associated with the proble

m of clustering?

A. Se7uential

B. ,ndeed

C. ash

ANSW!"

C

#

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