WGU D426 Objective Assessment Study Guide 2026–2027 | Updated Practice Questions & Detailed Explanations

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WGU - D426 Objective Assessment (NEW UPDATED VERSION) LATEST
ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS AND
ANSWERS) | GUARANTEED PASS A+ [2026-2027]




Database Application - CORRECT ANSWER Software that helps business users
interact with database systems.



QUESTION :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.



QUESTION :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.



QUESTION :Rules - CORRECT ANSWER Database systems ensure data is consistent
with structural and business rules.



QUESTION :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.



QUESTION :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.




2026 2027 GRADED A+

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QUESTION :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.



QUESTION :Metadata - CORRECT ANSWER Data about the database, such as
column names and the number of rows in each table.



QUESTION :Relational Database - CORRECT ANSWER Stores data in tables,
columns, and rows, similar to a spreadsheet.



QUESTION :Relational Database - CORRECT ANSWER All _________ ________
systems support the SQL query language.



QUESTION :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.



QUESTION :MongoDB (NoSQL) - CORRECT ANSWER The newer non-relational
systems are called NoSQL, for 'not only SQL', and are optimized for big data.



QUESTION :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.



QUESTION :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.



2026 2027 GRADED A+

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QUESTION :Data Type - CORRECT ANSWER INT stores integer values.

DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.



QUESTION :Database Design - CORRECT ANSWER Analysis

Logical design
Physical design


QUESTION :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.



QUESTION :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.



QUESTION :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.



QUESTION :Data Independence - CORRECT ANSWER Allows database designers to
tune query performance without changes to application programs.




2026 2027 GRADED A+