Engineering Questions with Answers - Multiple Choice Questions
Database MCQ – Multiversion Schemes
1 - Question
The most recent version of standard SQL prescribed by the American National Standards Institute is
a) SQL 2016
b) SQL 2002
c) SQL – 4
d) SQL2
View Answer
Answer: a
Explanation: SQL-2016 is the most recent version of standard SQL prescribed by the ANSI.
2 - Question
ANSI-standard SQL allows the use of special operators in conjunction with the WHERE clause. A special operator used to check whether an attribute value is null is
a) BETWEEN
b) IS NULL
c) LIKE
d) IN
View Answer
Answer: b
Explanation: Exists is used to check whether an attribute value is null or not in conjunction with the where clause.
3 - Question
A lock that prevents the use of any tables in the database from one transaction while another transaction is being processed is called a
a) Database-level lock
b) Table-level lock
c) Page-level lock
d) Row-level lock
View Answer
Answer: a
Explanation: Data base-level lock prevents the use of any tables in the data base from one transaction while another transaction is being processed.
4 - Question
A condition that occurs when two transactions wait for each other to unlock data is known as a(n)
a) Shared lock
b) Exclusive lock
c) Binary lock
d) Deadlock
View Answer
Answer: d
Explanation: Deadlock occurs when two transactions wait for each other to unlock data.
5 - Question
_______ means that data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
a) Serializability
b) Atomicity
c) Isolation
d) Time stamping
View Answer
Answer: c
Explanation: Isolation means that data used during the execution of a transaction can’t be used by a second transaction until the first one is completed.
6 - Question
A unit of storage that can store one or more records in a hash file organization is denoted as
a) Buckets
b) Disk pages
c) Blocks
d) Nodes
View Answer
Answer: a
Explanation: Buckets are used to store one or more records in a hash file organization.
7 - Question
The file organization which allows us to read records that would satisfy the join condition by using one block read is
a) Heap file organization
b) Sequential file organization
c) Clustering file organization
d) Hash files organization
View Answer
Answer: c
Explanation: Clustering file organization allows us to read records that would satisfy the join condition by using one block read.
8 - Question
Which of the following is not true about B+ trees?
a) B+ tree index takes the form of balanced tree
b) Performance of B+ tree degrades as the file grows
c) Look-up in B+ tree is straightforward and efficient
d) Insertion and deletion in B+ tree is complicated but efficient
View Answer
Answer: b
Explanation: The answer is evident.
9 - Question
The extent of the database resource that is included with each lock is called the level of
a) Impact
b) Granularity
c) Management
d) DBMS control
View Answer
Answer: b
Explanation: The extent of the data base resource that is included with each lock is called the level of Granularity.
10 - Question
DBMS periodically suspends all processing and synchronizes its files and journals through the use of
a) Checkpoint facility
b) Backup facility
c) Recovery manager
d) Database change log
View Answer
Answer: a
Explanation: DBMS periodically suspends all processing and synchronizes its files and journals through the use of Check point facility.