1
WGU D426
WGU D426/ D427 Exam | Data Management
– Applications | Questions & Answers| Grade
A| 100% Correct | (Latest 2025/ 2026)
Transaction Manager - ANS ✓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 - ANS ✓Data about the database, such as column names and the number of
rows in each table.
Relational Database - ANS ✓Stores data in tables, columns, and rows, similar to a
spreadsheet.
Relational Database - ANS ✓All _________ ________ systems support the SQL query
language.
Relational Database - ANS ✓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) - ANS ✓The newer non-relational systems are called NoSQL, for 'not
only SQL', and are optimized for big data.
SQL Statements - ANS ✓INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
WGU D426
, 2
WGU D426
DELETE deletes rows from a table.
CREATE TABLE (Statement) - ANS ✓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 - ANS ✓INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - ANS ✓Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) -
ANS ✓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) - ANS ✓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 - ANS ✓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 - ANS ✓Allows database designers to tune query performance
without changes to application programs.
WGU D426
, 3
WGU D426
Application Programming Interface (API) - ANS ✓To simplify the use of SQL with a
general-purpose language, database programs typically use an ____________ _____________
_______________.
MySQL Command-Line Client - ANS ✓A text interface included in the MySQL Server
download.
MySQL - ANS ✓'World' database, a database that is usually installed with ______.
Error Code - ANS ✓MySQL Server returns an _____ ____ and description when an SQL
statement is syntactically incorrect or the database cannot execute the statement.
Database Model - ANS ✓Data structures that prescribe how data is organized.
Operations that manipulate data structures.
Rules that govern valid data.
Tuple - ANS ✓An ORDERED collection of elements enclosed in parentheses.
Table - ANS ✓A _____ has a name, a fixed tuple of columns, and a varying set of rows.
Column - ANS ✓A ______ has a name and a data type.
Row - ANS ✓Is an unnamed tuple of values. Each value corresponds to a column and
belongs to the column's data type.
Data Type - ANS ✓A ____ _____ is a named set of values, from which column values are
drawn.
Union - ANS ✓Selects all rows of two tables.
WGU D426
WGU D426
WGU D426/ D427 Exam | Data Management
– Applications | Questions & Answers| Grade
A| 100% Correct | (Latest 2025/ 2026)
Transaction Manager - ANS ✓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 - ANS ✓Data about the database, such as column names and the number of
rows in each table.
Relational Database - ANS ✓Stores data in tables, columns, and rows, similar to a
spreadsheet.
Relational Database - ANS ✓All _________ ________ systems support the SQL query
language.
Relational Database - ANS ✓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) - ANS ✓The newer non-relational systems are called NoSQL, for 'not
only SQL', and are optimized for big data.
SQL Statements - ANS ✓INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
WGU D426
, 2
WGU D426
DELETE deletes rows from a table.
CREATE TABLE (Statement) - ANS ✓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 - ANS ✓INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - ANS ✓Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) -
ANS ✓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) - ANS ✓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 - ANS ✓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 - ANS ✓Allows database designers to tune query performance
without changes to application programs.
WGU D426
, 3
WGU D426
Application Programming Interface (API) - ANS ✓To simplify the use of SQL with a
general-purpose language, database programs typically use an ____________ _____________
_______________.
MySQL Command-Line Client - ANS ✓A text interface included in the MySQL Server
download.
MySQL - ANS ✓'World' database, a database that is usually installed with ______.
Error Code - ANS ✓MySQL Server returns an _____ ____ and description when an SQL
statement is syntactically incorrect or the database cannot execute the statement.
Database Model - ANS ✓Data structures that prescribe how data is organized.
Operations that manipulate data structures.
Rules that govern valid data.
Tuple - ANS ✓An ORDERED collection of elements enclosed in parentheses.
Table - ANS ✓A _____ has a name, a fixed tuple of columns, and a varying set of rows.
Column - ANS ✓A ______ has a name and a data type.
Row - ANS ✓Is an unnamed tuple of values. Each value corresponds to a column and
belongs to the column's data type.
Data Type - ANS ✓A ____ _____ is a named set of values, from which column values are
drawn.
Union - ANS ✓Selects all rows of two tables.
WGU D426
