Question 1

The primary deliverable from logical database design is a conceptual model.

Accepted Answer

False

Question 2

Conceptual modeling is performed during systems design.

Accepted Answer

False

Question 3

A relation corresponds to a computer file.

Accepted Answer

A relation is a concept from database management systems, describing the connection or association between data elements within a system. It does not directly correspond to a computer file, although it can be implemented using files or other data storage structures.

Question 4

The selection of the appropriate storage format for each attribute from the logical database model is made during physical database design.

Accepted Answer

This is because during physical database design, decisions are made regarding the implementation of the logical database model into an actual database system. These decisions include selecting the appropriate storage format for each attribute, such as data type and size, indexing, and partitioning.

Question 5

Each row of a relation corresponds to a record that contains data values for an entity.

Accepted Answer

This statement is true. Each row in a relational database represents a record, which holds data values for a particular entity or object.

Question 6

The selection of data-storage technologies is made during the systems implementation and operation phase.

Accepted Answer

The answer of The selection of data-storage technologies is made...

Question 7

The network model is the most common style for a logical database model.

Accepted Answer

The relational database model is currently the most common style for a logical database model. While the network model was popular in the past, it has been largely replaced by the popularity of relational databases.

Question 8

Normalization helps build a data model that is simple, not redundant, and requires minimum maintenance.

Accepted Answer

Normalization is a process that ensures data in a database is organized efficiently and reduces data redundancy. By doing so, it helps to simplify the data model, eliminate data anomalies and inconsistencies, and minimize data maintenance. Thus, the given statement is true.

Question 9

One of the purposes of logical and physical database design is to choose data-storage technologies that will efficiently, accurately, and securely process database activities.

Accepted Answer

Logical and physical database design are important steps in choosing the appropriate data storage technologies that will ensure efficient, accurate, and secure processing of database activities.

Question 10

Each column in a relation corresponds to an entity type.

Accepted Answer

Each column in a relation corresponds to an attribute or property of an entity type, not the entity type itself. The entity type is represented by the entire relation.

Question 11

The network database model is a popular database technology for new information systems.

Accepted Answer

The network database model was popular in the 1960s and 1970s, but it was largely replaced by relational database systems in the 1980s. Additionally, newer technologies such as NoSQL databases have emerged as alternatives to both network and relational models.

Question 12

In general, data structure refers to grouping attributes from the logical database model into physical records.

Accepted Answer

This statement correctly defines data structure as the process of organizing attributes into physical records in the database.

Question 13

A file organization is an arrangement of related records in secondary memory so that individual and groups of records can be stored, retrieved, and updated rapidly.

Accepted Answer

This statement is true. A file organization is a way of arranging related data in a secondary memory storage system so that it can be easily and efficiently accessed, searched, and updated. Different types of file organizations include sequential files, indexed files, and direct access files, each with their own advantages and disadvantages depending on the specific needs of the application.

Question 14

One property of a relation is that entries in columns are from the same set of values.

Accepted Answer

This statement is true. A relation is a set of ordered pairs, where each pair consists of a value from one set (the domain) and a value from another set (the range). In a table representing a relation, each column represents a set of values from the same set. This is known as the domain or range of the relation, depending on the column. Therefore, entries in columns are from the same set of values in a relation.

Question 15

Referencing a relation, the sequence of columns cannot be interchanged without changing the meaning or use of the relation.

Accepted Answer

The answer of Referencing a relation, the sequence of columns...

Question 16

When using the normalized relation notation, the primary key attribute is indicated by a dashed underline.

Accepted Answer

The answer of When using the normalized relation notation, the...

Question 17

During logic modeling, the normalized data requirements from all user interfaces are combined into one consolidated logical database model.

Accepted Answer

During logic modeling, data requirements are analyzed to create a conceptual data model, but it is not yet consolidated into one physical database model.

Question 18

During physical database design, relations from logical database design are translated into computer file specifications.

Accepted Answer

This statement is true. During physical database design, the logical database design is transformed into physical specifications, including specifying the data types, storage structures, and file organizations for the database files that will be used to store and manage the data.

Question 19

Generally speaking, logical and physical database design is performed in parallel with other systems design steps.

Accepted Answer

Logical and physical database design is an integral part of the systems design process, and it is typically performed in parallel with other systems design steps such as requirements gathering, analysis, and specification. By designing the database in conjunction with other system components, designers can ensure that the database meets the requirements of the system and is well-integrated with other elements of the system.

Question 20

Object-oriented database models are the most frequently used database technologies for new information systems development.

Accepted Answer

Relational database models are still the most commonly used database technologies for new information systems development. Object-oriented database models are used in certain specialized situations, but are not as commonly used as relational models.

Quiz 9: Designing Databases