D426 WGU EXAM UPDATED ACTUAL EXAM WITH CORRECT SOLUTIONS

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D426 WGU EXAM UPDATED ACTUAL EXAM WITH CORRECT SOLUTIONS

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D426 WGU EXAM UPDATED ACTUAL EXAM WITH CORRECT SOLUTIONS

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|//|\\| 1|P a g e |/|\|| |//|\\| ||//|\\|| |/|\\|| |/|\\||

D426 WGU EXAM 2025 - 2026 UPDATED ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

ACTUAL EXAM WITH CORRECT |//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

SOLUTIONS.

Software that helps business users interact with database systems. - correct ||//|\\|| |//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

answer- Database Application
||//|\\|| ||//|\\|| ||//|\\||

Responsible for securing the database system against unauthorized ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

users. A database administrator enforces procedures for user access and
||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\||

database system availability. - correct answer- Database Administrator
||//|\\|| ||//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

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. - correct answer- ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

Authorization

Database systems ensure data is consistent with structural and business ||//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

rules. - correct answer- Rules ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

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 ||//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\||

,|//|\\| 2|P a g e |/|\|| |//|\\| ||//|\\|| |/|\\|| |/|\\||

instructions are executed on the data. - correct answer- Query Processor ||//|\\|| |//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

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. - correct answer- Storage Manager ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

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. - correct answer- Transaction Manager
||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

Data about the database, such as column names and the number of
||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\|| |//|\\||

rows in each table. - correct answer- Metadata ||//|\\|| ||//|\\|| |//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\||

Stores data in tables, columns, and rows, similar to a spreadsheet. - correct
||//|\\|| |//|\\|| ||//|\\|| |//|\\|| ||//|\\|| |//|\\|| ||//|\\|| |//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

answer- Relational Database
||//|\\|| ||//|\\|| ||//|\\||

All systems support the SQL query
||//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\||

language. - correct answer- Relational Database ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

, |//|\\| 3|P a g e |/|\|| |//|\\| ||//|\\|| |/|\\|| |/|\\||

Relational systems are ideal for databases that require an accurate ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\||

record of every transaction, such as banking, airline reservation systems,
||//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

and student records. - correct answer- Relational Database
||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

The newer non-relational systems are called NoSQL, for 'not only SQL',
||//|\\|| |//|\\|| ||//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

and are optimized for big data. - correct answer- MongoDB (NoSQL)
||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

INSERT inserts rows into a table. SELECT ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\||

retrieves data from a table. UPDATE modifies ||//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\||

data in a table. ||//|\\|| ||//|\\|| ||//|\\||

DELETE deletes rows from a table. - correct answer- SQL Statements ||//|\\|| ||//|\\|| ||//|\\|| |//|\\|| ||//|\\|| ||//|\\|| ||//|\\|| |//|\\|| |//|\\|| ||//|\\||

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. - correct answer- CREATE TABLE (Statement) ||//|\\|| |//|\\|| |//|\\|| |//|\\|| |//|\\|| ||//|\\||

INT stores integer values. ||//|\\|| |//|\\|| |//|\\||

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Uploaded on: August 28, 2025
Number of pages: 29
Written in: 2025/2026
Type: Exam (elaborations)
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