36 + Mcqs in Managing Multiuser Databases Page 1 McqOptions

1.	In optimistic locking, the assumption is made that conflict will occur.%!
A.	True
B.	False
Answer» C.

Discussion

2.	An ACID transaction is one that is atomic, consistent isolated, and durable.%!
A.	True
B.	False
Answer» B. False

Discussion

3.	An exclusive lock locks the item from change but not from read.%!
A.	True
B.	False
Answer» C.

Discussion

4.	Locks placed by command are implicit locks.%!
A.	True
B.	False
Answer» C.

Discussion

5.	Locks placed by the DBMS are explicit locks.%!
A.	True
B.	False
Answer» C.

Discussion

6.	A durable transaction is one in which all committed changes are permanent.%!
A.	True
B.	False
Answer» B. False

Discussion

7.	A point of synchronization between the database and the transaction log is generally referred to as a stop point.%!
A.	True
B.	False
Answer» C.

Discussion

8.	Database administration refers to a function that applies to the entire organization.%!
A.	True
B.	False
Answer» C.

Discussion

9.	When two transactions are being processed against the database at the same time they are termed concurrent transactions.%!
A.	True
B.	False
Answer» B. False

Discussion

10.	The size of the lock is referred to as the lock granularity.%!
A.	True
B.	False
Answer» B. False

Discussion

11.	A transaction is a series of actions to be taken on the database so that either all of them are performed successfully or none of them are performed at all.%!
A.	True
B.	False
Answer» B. False

Discussion

12.	The transaction log contains a copy of every database record (or page) after it has changed. These records are called before images.%!
A.	True
B.	False
Answer» C.

Discussion

13.	The size of a lock is referred to as lock sizing.%!
A.	True
B.	False
Answer» C.

Discussion

14.	The overall responsibility of the DBA is to facilitate the development and use of the database.%!
A.	True
B.	False
Answer» B. False

Discussion

15.	A phantom read occurs when a transaction rereads data it has previously read and finds modifications or deletions caused by a committed transaction.%!
A.	True
B.	False
Answer» C.

Discussion

16.	The lost update problem is when User A reads data that have been processed by a portion of a transaction from User B.%!
A.	True
B.	False
Answer» C.

Discussion

17.	When one transaction reads a changed record that has not been committed to the database a filthy read occurs.%!
A.	True
B.	False
Answer» C.

Discussion

18.	Resource locking is a process to prevent multiple applications from obtaining copies of the same record when the record is about to be changed.%!
A.	True
B.	False
Answer» B. False

Discussion

19.	The goal of database security is to ensure that only authorized users can perform authorized activities at authorized times.%!
A.	True
B.	False
Answer» B. False

Discussion

20.	Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.%!
A.	True
B.	False
Answer» B. False

Discussion

21.	In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.%!
A.	Read committed
B.	Read uncommitted
C.	Repeatable read
D.	Serializable
Answer» B. Read uncommitted

Discussion

22.	*$_In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.?
A.	Read committed
B.	Read uncommitted
C.	Repeatable read
D.	Serializable
Answer» B. Read uncommitted

Discussion

23.	/_Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads??
A.	Read committed
B.	Read uncommitted
C.	Repeatable read
D.	Serializable
Answer» D. Serializable

Discussion

24.	/_Locks placed by the DBMS are called ________ .?
A.	implicit locks
B.	explicit locks
C.	exclusive locks
D.	shared locks
Answer» B. explicit locks

Discussion

25.	/_Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur??
A.	Read committed
B.	Read uncommitted
C.	Repeatable read
D.	Serializable
Answer» C. Repeatable read

Discussion

26.	/_A transaction for which all committed changes are permanent is called:?
A.	atomic.
B.	consistent.
C.	isolated.
D.	durable.
Answer» E.

Discussion

27.	_ A transaction for which all committed changes are permanent is called:$?
A.	atomic.
B.	consistent.
C.	isolated.
D.	durable.
Answer» E.

Discussion

28.	_ Which of the following refers to a cursor type where changes of any type and from any source are visible?$?
A.	Forward only
B.	Static
C.	Keyset
D.	Dynamic
Answer» E.

Discussion

29.	_ What is the overall responsibility of the DBA?$?
A.	Facilitate the development and use of the database
B.	Create and populate tables
C.	Development, operation, and maintenance of the database and its applications
D.	Both the first and third answers above are correct.
Answer» E.

Discussion

30.	_ Which of the following occurs when one transaction reads a changed record that has not been committed to the database?$?
A.	Nonrepeatable read
B.	Phantom read
C.	Dirty read
D.	Consistent read
Answer» D. Consistent read

Discussion

31.	_Which of the following occurs when a transaction rereads data and finds new rows that were inserted by a command transaction since the prior read?$?
A.	Nonrepeatable read
B.	Phantom read
C.	Dirty read
D.	Consistent read
Answer» C. Dirty read

Discussion

32.	_Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?$?
A.	Forward only
B.	Static
C.	Keyset
D.	Dynamic
Answer» D. Dynamic

Discussion

33.	_A cursor type in which the application sees the data as they were at the time the cursor was opened is called:$?
A.	forward only
B.	static
C.	keyset
D.	dynamic
Answer» C. keyset

Discussion

34.	_A cursor type in which the application can only move forward through the recordset is called:$?
A.	forward only.
B.	static.
C.	keyset.
D.	dynamic.
Answer» B. static.

Discussion

35.	Which of the following locks the item from change but not from read?$?
A.	Implicit lock
B.	Explicit lock
C.	Exclusive lock
D.	Shared lock
Answer» E.

Discussion

36.	Which of the following locks the item from change but not from read??
A.	Implicit lock
B.	Explicit lock
C.	Exclusive lock
D.	Shared lock
Answer» E.

Discussion

Explore topic-wise MCQs in Database.

In optimistic locking, the assumption is made that conflict will occur.%!

An ACID transaction is one that is atomic, consistent isolated, and durable.%!

An exclusive lock locks the item from change but not from read.%!

Locks placed by command are implicit locks.%!

Locks placed by the DBMS are explicit locks.%!

A durable transaction is one in which all committed changes are permanent.%!

A point of synchronization between the database and the transaction log is generally referred to as a stop point.%!

Database administration refers to a function that applies to the entire organization.%!

When two transactions are being processed against the database at the same time they are termed concurrent transactions.%!

The size of the lock is referred to as the lock granularity.%!

A transaction is a series of actions to be taken on the database so that either all of them are performed successfully or none of them are performed at all.%!

The transaction log contains a copy of every database record (or page) after it has changed. These records are called before images.%!

The size of a lock is referred to as lock sizing.%!

The overall responsibility of the DBA is to facilitate the development and use of the database.%!

A phantom read occurs when a transaction rereads data it has previously read and finds modifications or deletions caused by a committed transaction.%!

The lost update problem is when User A reads data that have been processed by a portion of a transaction from User B.%!

When one transaction reads a changed record that has not been committed to the database a filthy read occurs.%!

Resource locking is a process to prevent multiple applications from obtaining copies of the same record when the record is about to be changed.%!

The goal of database security is to ensure that only authorized users can perform authorized activities at authorized times.%!

Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.%!

In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.%!

*$_In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.?

*/*_Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads??

*/*_Locks placed by the DBMS are called ________ .?

*/*_Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur??

*/*_A transaction for which all committed changes are permanent is called:?

_ A transaction for which all committed changes are permanent is called:$?

_ Which of the following refers to a cursor type where changes of any type and from any source are visible?$?

_ What is the overall responsibility of the DBA?$?

_ Which of the following occurs when one transaction reads a changed record that has not been committed to the database?$?

_Which of the following occurs when a transaction rereads data and finds new rows that were inserted by a command transaction since the prior read?$?

_Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?$?

_A cursor type in which the application sees the data as they were at the time the cursor was opened is called:$?

_A cursor type in which the application can only move forward through the recordset is called:$?

Which of the following locks the item from change but not from read?$?

Which of the following locks the item from change but not from read??

/_Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads??

/_Locks placed by the DBMS are called ________ .?

/_Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur??

/_A transaction for which all committed changes are permanent is called:?