WGU - D426: Objective Assessment Exam
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Database Application - CORRECT ANSWER Software that helps business users interact with
database systems.
Database Administrator - CORRECT ANSWER Responsible for securing the database system
against unauthorized users. A database administrator enforces procedures for user access and database
system availability.
Authorization - CORRECT ANSWER Many database users should have limited access to
specific tables, columns, or rows of a database. Database systems authorize individual users to access
specific data.
Rules - CORRECT ANSWER Database systems ensure data is consistent with structural and
business rules.
Query Processor - CORRECT ANSWER Interprets queries, creates a plan to modify the
database or retrieve data, and returns query results to the application. Performs query optimization to
ensure the most efficient instructions are executed on the data.
Storage Manager - CORRECT ANSWER Translates the query processor instructions into low-
level file-system commands that modify or retrieve data. Database sizes range from megabytes to
many terabytes, so the storage manager uses indexes to quickly locate data.
Transaction Manager - CORRECT ANSWER Ensures transactions are properly executed. The
transaction manager prevents conflicts between concurrent transactions. The transaction manager also
restores the database to a consistent state in the event of a transaction or system failure.
Metadata - CORRECT ANSWER Data about the database, such as column names and the
number of rows in each table.
,Relational Database - CORRECT ANSWER Stores data in tables, columns, and rows, similar
to a spreadsheet.
Relational Database - CORRECT ANSWER All _________ ________ systems support the
SQL query language.
Relational Database - CORRECT ANSWER Relational systems are ideal for databases that
require an accurate record of every transaction, such as banking, airline reservation systems, and
student records.
MongoDB (NoSQL) - CORRECT ANSWER The newer non-relational systems are called
NoSQL, for 'not only SQL', and are optimized for big data.
SQL Statements - CORRECT ANSWER INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
DELETE deletes rows from a table.
CREATE TABLE (Statement) - CORRECT ANSWER A statement that creates a new table by
specifying the table and column names. Each column is assigned a data type that indicates the format
of column values. Data types can be numeric, textual, or complex.
Data Type - CORRECT ANSWER INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - CORRECT ANSWER Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) - CORRECT
ANSWER This phase specifies database requirements without regard to a specific database
, system. Requirements are represented as entities, relationships, and attributes. An entity is a person,
place, activity, or thing. A relationship is a link between entities, and an attribute is a descriptive
property of an entity.
Logical Design (Database Design) - CORRECT ANSWER This phase implements database
requirements in a specific database system. For relational database systems, _________ design
converts entities, relationships, and attributes into tables, keys, and columns.
Physical Design - CORRECT ANSWER Specifies indexes, table structures, and partitions.
This phase adds indexes and specifies how tables are organized on storage media. Affects query
processing speed but never affects the query result.
Data Independence - CORRECT ANSWER Allows database designers to tune query
performance without changes to application programs.
Application Programming Interface (API) - CORRECT ANSWER To simplify the use of SQL
with a general-purpose language, database programs typically use an ____________ _____________
_______________.
MySQL Command-Line Client - CORRECT ANSWER A text interface included in the
MySQL Server download.
MySQL - CORRECT ANSWER 'World' database, a database that is usually installed with
______.
Error Code - CORRECT ANSWER MySQL Server returns an _____ ____ and description
when an SQL statement is syntactically incorrect or the database cannot execute the statement.
Database Model - CORRECT ANSWER Data structures that prescribe how data is organized.
Operations that manipulate data structures.
Rules that govern valid data.
Tuple - CORRECT ANSWER An ORDERED collection of elements enclosed in parentheses.
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Database Application - CORRECT ANSWER Software that helps business users interact with
database systems.
Database Administrator - CORRECT ANSWER Responsible for securing the database system
against unauthorized users. A database administrator enforces procedures for user access and database
system availability.
Authorization - CORRECT ANSWER Many database users should have limited access to
specific tables, columns, or rows of a database. Database systems authorize individual users to access
specific data.
Rules - CORRECT ANSWER Database systems ensure data is consistent with structural and
business rules.
Query Processor - CORRECT ANSWER Interprets queries, creates a plan to modify the
database or retrieve data, and returns query results to the application. Performs query optimization to
ensure the most efficient instructions are executed on the data.
Storage Manager - CORRECT ANSWER Translates the query processor instructions into low-
level file-system commands that modify or retrieve data. Database sizes range from megabytes to
many terabytes, so the storage manager uses indexes to quickly locate data.
Transaction Manager - CORRECT ANSWER Ensures transactions are properly executed. The
transaction manager prevents conflicts between concurrent transactions. The transaction manager also
restores the database to a consistent state in the event of a transaction or system failure.
Metadata - CORRECT ANSWER Data about the database, such as column names and the
number of rows in each table.
,Relational Database - CORRECT ANSWER Stores data in tables, columns, and rows, similar
to a spreadsheet.
Relational Database - CORRECT ANSWER All _________ ________ systems support the
SQL query language.
Relational Database - CORRECT ANSWER Relational systems are ideal for databases that
require an accurate record of every transaction, such as banking, airline reservation systems, and
student records.
MongoDB (NoSQL) - CORRECT ANSWER The newer non-relational systems are called
NoSQL, for 'not only SQL', and are optimized for big data.
SQL Statements - CORRECT ANSWER INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
DELETE deletes rows from a table.
CREATE TABLE (Statement) - CORRECT ANSWER A statement that creates a new table by
specifying the table and column names. Each column is assigned a data type that indicates the format
of column values. Data types can be numeric, textual, or complex.
Data Type - CORRECT ANSWER INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - CORRECT ANSWER Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) - CORRECT
ANSWER This phase specifies database requirements without regard to a specific database
, system. Requirements are represented as entities, relationships, and attributes. An entity is a person,
place, activity, or thing. A relationship is a link between entities, and an attribute is a descriptive
property of an entity.
Logical Design (Database Design) - CORRECT ANSWER This phase implements database
requirements in a specific database system. For relational database systems, _________ design
converts entities, relationships, and attributes into tables, keys, and columns.
Physical Design - CORRECT ANSWER Specifies indexes, table structures, and partitions.
This phase adds indexes and specifies how tables are organized on storage media. Affects query
processing speed but never affects the query result.
Data Independence - CORRECT ANSWER Allows database designers to tune query
performance without changes to application programs.
Application Programming Interface (API) - CORRECT ANSWER To simplify the use of SQL
with a general-purpose language, database programs typically use an ____________ _____________
_______________.
MySQL Command-Line Client - CORRECT ANSWER A text interface included in the
MySQL Server download.
MySQL - CORRECT ANSWER 'World' database, a database that is usually installed with
______.
Error Code - CORRECT ANSWER MySQL Server returns an _____ ____ and description
when an SQL statement is syntactically incorrect or the database cannot execute the statement.
Database Model - CORRECT ANSWER Data structures that prescribe how data is organized.
Operations that manipulate data structures.
Rules that govern valid data.
Tuple - CORRECT ANSWER An ORDERED collection of elements enclosed in parentheses.
