Explore topic-wise MCQs in Database.

This section includes 30 Mcqs, each offering curated multiple-choice questions to sharpen your Database knowledge and support exam preparation. Choose a topic below to get started.

1.

Distributing the columns of a table into several separate physical records is known as horizontal partitioning.

A. 1
B.
Answer» C.
Discussion
2.

The three newest database architectures in use today are relational, multidimensional and hierarchical.

A. 1
B.
Answer» C.
Discussion
3.

Data-volume and frequency-of-use statistics are not critical inputs to the physical database design process.

A. 1
B.
Answer» C.
Discussion
4.

Some advantages of partitioning include: efficiency, security, and load balancing.

A. 1
B.
Answer» B.
Discussion
5.

A pointer is a detailed coding scheme recognized by system software for representing organizational data.

A. 1
B.
Answer» C.
Discussion
6.

It is usually not very important to design the physical database to minimize the time required by users to interact with the information systems.

A. 1
B.
Answer» C.
Discussion
7.

In general, larger block sizes are used for online transaction processing applications and smaller block sizes are used for databases with a decision support or data warehousing system.

A. 1
B.
Answer» C.
Discussion
8.

A field represents each component of a composite attribute.

A. 1
B.
Answer» B.
Discussion
9.

A multidimensional database model is used most often in which of the following models?

A. Data warehouse
B. Relational
C. Hierarchical
D. Network
Answer» B. Relational
Discussion
10.

What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length?

A. VARCHAR2
B. CHAR
C. LONG
D. NUMBER
Answer» C. LONG
Discussion
11.

Hashing algorithm converts a primary key value into a record address.

A. 1
B.
Answer» B.
Discussion
12.

The primary goal of physical database design is data processing efficiency.

A. 1
B.
Answer» B.
Discussion
13.

The fastest read/write time and most efficient data storage of any disk array type is:

A. RAID-0.
B. RAID-1.
C. RAID-2.
D. RAID-3.
Answer» B. RAID-1.
Discussion
14.

A bitmap index is an index on columns from two or more tables that come from the same domain of values.

A. 1
B.
Answer» C.
Discussion
15.

Denormalization and clustering can work well to minimize data access time for small records.

A. 1
B.
Answer» B.
Discussion
16.

An extent is a contiguous section of disk storage space.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
17.

Which of the following improves a query's processing time?

A. Write complex queries.
B. Combine a table with itself.
C. Query one query within another.
D. Use compatible data types.
Answer» E.
Discussion
18.

Sequential retrieval on a primary key for sequential file storage has which of the following features?

A. Very fast
B. Moderately fast
C. Slow
D. Impractical
Answer» B. Moderately fast
Discussion
19.

Which of the following are integrity controls that a DBMS may support?

A. Assume a default value in a field unless a user enters a value for that field.
B. Limit the set of permissible values that a field may assume.
C. Limit the use of null values in some fields.
D. All of the above.
Answer» E.
Discussion
20.

When storage space is scarce and physical records cannot span pages, creating multiple physical records from one logical relation will minimize wasted storage space.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
21.

Which of the following is not a factor to consider when switching from small to large block size?

A. The length of all of the fields in a table row.
B. The number of columns
C. Block contention
D. Random row access speed
Answer» C. Block contention
Discussion
22.

A rule of thumb for choosing indexes for a relational database includes which of the following?

A. Indexes are more useful on smaller tables.
B. Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.
C. Do not specify a unique index for the primary key of each table.
D. Be careful indexing attributes that have null values.
Answer» E.
Discussion
23.

Two basic constructs to link one piece of data with another piece of data: sequential storage and pointers.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
24.

If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true?

A. All fields are stored in one relation.
B. All fields are stored in two relations.
C. All fields are stored in three relations.
D. All fields are stored in four relations.
Answer» C. All fields are stored in three relations.
Discussion
25.

The blocking factor is:

A. a group of fields stored in adjacent memory.
B. the number of physical records per page.
C. attributes grouped together by the same primary key.
D. attributes grouped together by the same secondary key.
Answer» C. attributes grouped together by the same primary key.
Discussion
26.

Selecting a data type involves which of the following?

A. Maximize storage space
B. Represent most values
C. Improve data integrity
D. All of the above.
Answer» D. All of the above.
Discussion
27.

What is the best data type definition for Oracle when a field is alphanumeric and has a length that can vary?

A. VARCHAR2
B. CHAR
C. LONG
D. NUMBER
Answer» B. CHAR
Discussion
28.

Which of the following is an advantage of partitioning?

A. Complexity
B. Inconsistent access speed
C. Extra space
D. Security
Answer» E.
Discussion
29.

A secondary key is which of the following?

A. Nonunique key
B. Primary key
C. Useful for denormalization decisions
D. Determines the tablespace required
Answer» B. Primary key
Discussion
30.

If a denormalization situation exists with a one-to-one binary relationship, which of the following is true?

A. All fields are stored in one relation.
B. All fields are stored in two relations.
C. All fields are stored in three relations.
D. All fields are stored in four relations.
Answer» B. All fields are stored in two relations.
Discussion