WGU C175 - Chapter 2: Data Modeling
UPDATED ACTUAL Exam Questions and
CORRECT Answers
3 Vs (3 basic characteristics of Big Data databases) - CORRECT ANSWER - Volume,
velocity, and variety
Abstract Data Type (ADT) - CORRECT ANSWER - Data type that describes a set of
similar objects with shared and encapsulated data representation and methods. An abstract data
type is generally used to describe complex objects
American National Standards Institute (ANSI) - CORRECT ANSWER - The group that
accepted the DBTG recommendation and augmented database standards in 1975 through its
SPARC committee
Application Programming Interface (API) - CORRECT ANSWER - Software through
which programmers interact with middleware. An API allows the use of generic SQL code,
thereby allowing client processes to be database server-independent
Attribute - CORRECT ANSWER - A characteristic of an entity or object. An attribute has
a name and a data type
Balancing - CORRECT ANSWER - Ensuring that the processing load is distributed evenly
among multiple servers
Big Data - CORRECT ANSWER - A movement to find new and better ways to manage
large amounts of web-generated data and derive business insight from it, while simultaneously
providing high performance and scalability at a reasonable cost
Class - CORRECT ANSWER - A collection of similar objects with shared structure
(attributes) and behavior (methods). A class encapsulates an object's data representation and a
method's implementation. Classes are organized in a class hierarchy
, Class Diagram Notation - CORRECT ANSWER - The set of symbols used in the creation
of class diagrams in UML object modeling
Class Diagrams - CORRECT ANSWER - A diagram used to represent data and their
relationships in UML object notation
Class Hierarchy - CORRECT ANSWER - The organization of classes in a hierarchical
tree in which each parent class is a superclass and each child class is a subclass
Client - CORRECT ANSWER - Any process that requests specific services from server
services processes in a client/server environment
Client Node - CORRECT ANSWER - One of three types of nodes used in the Hadoop
Distributed File System (HDFS). The client node acts as the interface between user application
and the HDFS.
Complex Object - CORRECT ANSWER - An object formed by several different objects
in complex relationships
Conceptual Model - CORRECT ANSWER - The output of conceptual design process.
Provides a global view of an entire database and describes the main data objects, avoiding details
Conceptual Schema - CORRECT ANSWER - A representation of the conceptual model,
usually expressed graphically
Connectivity - CORRECT ANSWER - The type of relationship between entities. one-to-
one, one-to-many, many-to-many
Constraint - CORRECT ANSWER - A restriction placed on data, usually expressed in the
form of rules. Constraints are important because they help to ensure data integrity
UPDATED ACTUAL Exam Questions and
CORRECT Answers
3 Vs (3 basic characteristics of Big Data databases) - CORRECT ANSWER - Volume,
velocity, and variety
Abstract Data Type (ADT) - CORRECT ANSWER - Data type that describes a set of
similar objects with shared and encapsulated data representation and methods. An abstract data
type is generally used to describe complex objects
American National Standards Institute (ANSI) - CORRECT ANSWER - The group that
accepted the DBTG recommendation and augmented database standards in 1975 through its
SPARC committee
Application Programming Interface (API) - CORRECT ANSWER - Software through
which programmers interact with middleware. An API allows the use of generic SQL code,
thereby allowing client processes to be database server-independent
Attribute - CORRECT ANSWER - A characteristic of an entity or object. An attribute has
a name and a data type
Balancing - CORRECT ANSWER - Ensuring that the processing load is distributed evenly
among multiple servers
Big Data - CORRECT ANSWER - A movement to find new and better ways to manage
large amounts of web-generated data and derive business insight from it, while simultaneously
providing high performance and scalability at a reasonable cost
Class - CORRECT ANSWER - A collection of similar objects with shared structure
(attributes) and behavior (methods). A class encapsulates an object's data representation and a
method's implementation. Classes are organized in a class hierarchy
, Class Diagram Notation - CORRECT ANSWER - The set of symbols used in the creation
of class diagrams in UML object modeling
Class Diagrams - CORRECT ANSWER - A diagram used to represent data and their
relationships in UML object notation
Class Hierarchy - CORRECT ANSWER - The organization of classes in a hierarchical
tree in which each parent class is a superclass and each child class is a subclass
Client - CORRECT ANSWER - Any process that requests specific services from server
services processes in a client/server environment
Client Node - CORRECT ANSWER - One of three types of nodes used in the Hadoop
Distributed File System (HDFS). The client node acts as the interface between user application
and the HDFS.
Complex Object - CORRECT ANSWER - An object formed by several different objects
in complex relationships
Conceptual Model - CORRECT ANSWER - The output of conceptual design process.
Provides a global view of an entire database and describes the main data objects, avoiding details
Conceptual Schema - CORRECT ANSWER - A representation of the conceptual model,
usually expressed graphically
Connectivity - CORRECT ANSWER - The type of relationship between entities. one-to-
one, one-to-many, many-to-many
Constraint - CORRECT ANSWER - A restriction placed on data, usually expressed in the
form of rules. Constraints are important because they help to ensure data integrity
