1410+ DataBase Management System (DBMS) Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Computer Science Engineering (CSE) , Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Science in Computer Science SY (BSc CS) , Bachelor of Science in Information Technology SY (BSc IT) , Bachelor of Computer Applications (BCA) .

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1351.	Relations produced from an E-R model will always be in
A.	First normal form
B.	Second normal form
C.	Third normal form
D.	Fourth normal form
Answer» C. Third normal form

1352.	Third normal form is inadequate in situation where the relation
A.	Has multiple candidate keys
B.	Has candidate keys that are composite
C.	Has overlapped candidate keys
D.	None of the above
Answer» A. Has multiple candidate keys

1353.	If a relation scheme is in BCNF, then it is also in
A.	First normal form
B.	Second normal form
C.	Third normal form
D.	Fourth normal form
Answer» C. Third normal form

1354.	A primary key when combined with a foreign key create
A.	Parent child relationship between the tables that connect them.
B.	Network model between the tables that connect them.
C.	Many-to-many relationship between the tables that connect them.
D.	None of the above.
Answer» A. Parent child relationship between the tables that connect them.

1355.	The set of permitted value for each attribute is called its
A.	Attribute set
B.	Attentive range
C.	Domain
D.	Group
Answer» C. Domain

1356.	The airline reservation system, the enables are date, flight number, place of departure, destination, type of plane & seats available. The primary key is
A.	Flight number
B.	Flight number + place of departure
C.	Flight number+ date
D.	Flight number + destination
Answer» C. Flight number+ date

1357.	A functional dependency of the form X→Y is trivial if
A.	YC= X
B.	Y C X
C.	X C =Y
D.	X C Y and Y C X
Answer» A. YC= X

1358.	The concept of locking can be used to solve the problem of
A.	Lost update
B.	Uncommitted dependency
C.	Inconsistent data
D.	Deadlock
Answer» A. Lost update

1359.	Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.
A.	It will result in a deadlock situation.
B.	It will immediately be granted.
C.	It will immediately be reject
Answer» B. It will immediately be granted.

1360.	A schedule S of n transactions is serializable if it is equivalent to some
A.	Serial schedule of the same n transactions.
B.	Non-serial schedule of the same n transactions.
C.	Serial schedule of different n transactions.
D.	Non-serial schedule of different n transactions.
Answer» A. Serial schedule of the same n transactions.

1361.	In two-phase locking protocol.
A.	All unlocking operations precede the first lock operation.
B.	All locking operations precede the first unlock operation.
C.	Locking and unlocking takes place simultaneously.
D.	None of the above.
Answer» B. All locking operations precede the first unlock operation.

1362.	Transaction timestamp is:
A.	Not unique for each transaction
B.	Larger for older transaction
C.	Unique identifier assigned to each transaction.
D.	None of the above.
Answer» C. Unique identifier assigned to each transaction.

1363.	The granularity of a database item can be chosen to be
A.	A whole file
B.	A database record
C.	The whole database
D.	All of the above.
Answer» D. All of the above.

1364.	If the complete execution of the transaction(s) takes the database from one consistent state to the other then that property of transaction is called:
A.	Isolation
B.	Durability
C.	Consistency preservation
D.	None of the above
Answer» C. Consistency preservation

1365.	Which of the following is not the state that the transaction undergoes?
A.	Failed
B.	Active
C.	Partially committed
D.	Non active
Answer» D. Non active

1366.	Timestamp can be generated by:
A.	Counter
B.	Current date/time
C.	None of the above
D.	Both (a) and (b)
Answer» D. Both (a) and (b)

1367.	Which of the following is the formal process for deciding which attributes should be grouped together in a relation?
A.	Normalization
B.	Performance Tuning
C.	Optimization
D.	None of the above
Answer» A. Normalization

1368.	Who developed normalization process?
A.	C.J. Date
B.	E.F. Codd
C.	Donald Chamberlain
D.	Collin White
Answer» B. E.F. Codd

1369.	Who developed the BCNF?
A.	Boyd and Cromwell
B.	Date and Codd
C.	Date and White
D.	Boyce and Codd
Answer» D. Boyce and Codd

1370.	What is the expansion of BCNF?
A.	Boyd-Cromwell Normal Form
B.	Boyce-Codd Normal Form
C.	Boyd-Codd Normal Form
D.	All of the above
Answer» B. Boyce-Codd Normal Form

1371.	Which of the following is the result of a transitive dependency?
A.	Insertion anomaly
B.	Modification anomaly
C.	Deletion anomaly
D.	All of the above
Answer» D. All of the above

1372.	Which of the following is true?
A.	Normalized data is the best representation of data.
B.	Data stored non-redundantly will be accessed faster than data stored many times.
C.	Normalized tables are the best way to store data.
D.	All of the above
Answer» D. All of the above

1373.	How many inference rules are there for functional dependencies?
A.	4
B.	5In t
C.	6
D.	7
Answer» C. 6

1374.	Which property ensures that each functional dependency is represented in some individual relations resulting after decomposition?
A.	Dependency preservation property
B.	Fully Functional dependency
C.	Lossless Join
D.	None of the above
Answer» A. Dependency preservation property

1375.	Every relation in BCNF is also in
A.	3NF
B.	2NF
C.	1NF
D.	None of the above
Answer» A. 3NF

1410+ DataBase Management System (DBMS) Solved MCQs

Relations produced from an E-R model will always be in

Third normal form is inadequate in situation where the relation

If a relation scheme is in BCNF, then it is also in

A primary key when combined with a foreign key create

The set of permitted value for each attribute is called its

The airline reservation system, the enables are date, flight number, place of departure, destination, type of plane & seats available. The primary key is

A functional dependency of the form X→Y is trivial if

The concept of locking can be used to solve the problem of

Assume transaction A holds a shared lock R. If transaction B also requests for a shared lock on R.

A schedule S of n transactions is serializable if it is equivalent to some

In two-phase locking protocol.

Transaction timestamp is:

The granularity of a database item can be chosen to be

If the complete execution of the transaction(s) takes the database from one consistent state to the other then that property of transaction is called:

Which of the following is not the state that the transaction undergoes?

Timestamp can be generated by:

Which of the following is the formal process for deciding which attributes should be grouped together in a relation?

Who developed normalization process?

Who developed the BCNF?

What is the expansion of BCNF?

Which of the following is the result of a transitive dependency?

Which of the following is true?

How many inference rules are there for functional dependencies?

Which property ensures that each functional dependency is represented in some individual relations resulting after decomposition?

Every relation in BCNF is also in

A table that contains one or more repeating groups is in which normal form?

A relation is said to be in 3 NF if (i) it is in 2 NF (ii) non-key attributes are independent of one another (iii) key attribute is not dependent on part of a composite key (iv) has no multi-valued dependency

Given the following relation it is not 3 NF because Student (roll no, name, course no, course max. marks, year of study, address)

Given the following relation Student (roll no, name, course no, course max. marks, year of study, address) The corresponding 3 NF relations are

BoyeCodd Normal Form (BCNF) is needed when

A relation is said to be in BCNF when

A 3 NF relation is converted to BCNF by

BCNF is needed because

A relation project guidance Project Guidance(professor, project, student no. st-name, dept) A professor can give many projects to many students A project will have many students A project may be guided by many professors The 4 NF relation corresponding to this are

A 3 NF relation is split into 4 NF

Using the SQL GROUP BY phrase with a SELECT statement can help detect which of the following problems?

What SQL command will allow you to change the table STUDENT to add the constraint named GradeCheck that states that the values of the Grade column must be greater than 0?

The NOT EXISTS keyword will be true if:

Changing cardinalities in a database is:

Which one of the following sorts rows in SQL?

The SQL keyword(s) ________ is used with wildcards.

If a relationship has a cascade updates constraint, then if ________ in the parent table is changed, then the same change will automatically be made to any corresponding foreign key value.

For every relationship, how many possible types of actions are there when enforcing minimum cardinalities?

In creating a procedure, you may get a message if you have compile errors. Which of the following is true?

Which of the following is not true about indexes?

In ……….. normal forms, any multivalued attributes have been removed.

A (n) …………….. is an attribute in a relation that serves as a primary key of another relation in the same.

In the process of decomposition is called as

A relation Schema R is in ……….. if it is in 3NF and satisfies an additional constant thatfor every FD X->A. X must be a candidate key.

1376.	A table that contains one or more repeating groups is in which normal form?
A.	1NF
B.	2NF
C.	3NF
D.	Unnormalized Form
Answer» D. Unnormalized Form

1377.	A relation is said to be in 3 NF if (i) it is in 2 NF (ii) non-key attributes are independent of one another (iii) key attribute is not dependent on part of a composite key (iv) has no multi-valued dependency
A.	i and iii
B.	i and iv
C.	i and ii
D.	ii and iv
Answer» C. i and ii

1378.	Given the following relation it is not 3 NF because Student (roll no, name, course no, course max. marks, year of study, address)
A.	it is not in 2 NF
B.	it does not have composite key
C.	non-key attributes course no and course max. marks are functionally dependent
D.	it has more than 3 non-key attributes
Answer» C. non-key attributes course no and course max. marks are functionally dependent

1379.	Given the following relation Student (roll no, name, course no, course max. marks, year of study, address) The corresponding 3 NF relations are
A.	student (roll no, name, year of study, address) course (course no, course max. marks)
B.	student ( roll no, name, year of study, address) student (roll no, course no) course (course no, course max. marks)
C.	student (roll no , name, address) year (roll no, year of study) course (course no, course max. marks)
D.	student (roll no, name, address) course (course no, course max. marks, year of study)
Answer» B. student ( roll no, name, year of study, address) student (roll no, course no) course (course no, course max. marks)

1380.	BoyeCodd Normal Form (BCNF) is needed when
A.	two non-key attributes are dependent
B.	there is more then one possible composite key
C.	there are two or more possible composite overlapping keys and one attributeof a composite key is dependent on an attribute of another composite key
D.	there are two possible keys and they are dependent on one another
Answer» C. there are two or more possible composite overlapping keys and one attributeof a composite key is dependent on an attribute of another composite key

1381.	A relation is said to be in BCNF when
A.	it has overlapping composite keys
B.	it has no composite keys
C.	it has no multivalued dependencies
D.	it has no overlapping composite keys which have related attributes
Answer» D. it has no overlapping composite keys which have related attributes

1382.	A 3 NF relation is converted to BCNF by
A.	removing composite keys
B.	removing multivalued dependencies
C.	dependent attributes of overlapping composite keys are put in a separateRelation
D.	dependent non-key attributes are put in a separate table
Answer» C. dependent attributes of overlapping composite keys are put in a separateRelation

1383.	BCNF is needed because
A.	otherwise tuples may be duplicated
B.	when a data is deleted tuples may be lost
C.	updating is otherwise difficult
D.	when there is dependent attributes in two possible composite keys one of the attributes is unnecessarily duplicated in the tuples
Answer» D. when there is dependent attributes in two possible composite keys one of the attributes is unnecessarily duplicated in the tuples

1384.	Given the relation Supplier(s_id, p_order, s_name, qty) Given that there is a unique s_name for each s_id and that s_id, p_order is a composite key, find the correct statement among the following: i. this relation is a BCNF ii. this is 3 NF relation iii. this is a 2 NF relation iv. this is a 1 NF relation
A.	i and ii
B.	ii and iii
C.	i and iv
D.	i and iii
Answer» D. i and iii

1385.	A relation project guidance Project Guidance(professor, project, student no. st-name, dept) A professor can give many projects to many students A project will have many students A project may be guided by many professors The 4 NF relation corresponding to this are
A.	Prof_Project (professor, st_name, dept) Proj_stud (project, student no.)
B.	Prof_stud (professor, student no) Proj_stud (project, student no)
C.	Student (student no, st_name, dept) Student (student no, st_name, dept)
D.	Professor(professor, project) Professor( professor, project, dept) Student (student no, st_name, dept)
Answer» B. Prof_stud (professor, student no) Proj_stud (project, student no)