WGU D426 STUDY GUIDE (RED TEXT ONLY) 220+ ACTUAL EXAM QUESTIONS AND ANSWERS (A+ GUIDE SOLUTION) NEWEST 2025/2026

WGU D426 STUDY GUIDE (RED TEXT ONLY) 220+
ACTUAL EXAM QUESTIONS AND ANSWERS (A+
GUIDE SOLUTION) NEWEST 2025/2026

Terms in this set (225)

A _______________ is Database Application
software that helps business
users interact with database
systems


Database Role: Database Administrator
What role is responsible for
securing the database
system against unauthorized
users. This role enforces
procedures for user access
and database system
availability.




Authorization
Many database users should
have limited access to
specific tables, columns, or
rows of a database. What
database "special
requirement" allows
database systems to allow
individual users access to
specific data?

,Database special Rules
requirements:
Database systems ensure
data is consistent with
structural and
business______________.


Architecture Question: This Query Processor
interprets Queries, creates a
plan to modify the database
or retrieve data, and returns
query results to the
application.


Architecture Question: The Query Optimization
query processor performs
___________ to ensure the
most efficient instructions
are executed on the data.




Architecture Question: This Storage Manager 1 multiple choice option

translates the query
processor instructions into
low level file system
commands that modify or
retrieve data.


Indexes
Database sizes range from
megabytes to many
terabytes, so the storage
manager uses __________ to
quickly locate data.

,Architecture Question: Transaction Manager 2 multiple choice options

The ______________
ensures the following:
- Ensures transactions
areproperly executed. -
Prevents conflicts between
concurrent transactions.
- Restores the
database toa consistent
state in the event of
transaction or system
failure.


General Database Metadata 2 multiple choice options

Systems Question:
This is data about the
database, such as column
names, number of rows in a
table, etc.


Is the MongoDB database Open-Source 3 multiple choice options

engine Open-Source,
Private, Free, or
Commercial?

What is the MongoDB NoSQL 3 multiple choice options

database Engine type?

SQL statement: INSERT 3 multiple choice options

This command inputs rows
into a table.

SQL Statement: SELECT 3 multiple choice options

This command retrieves data
from a table

UPDATE 3 multiple choice options
SQL Statement:
This command modifies data
in a table.

, SQL Statement: DELETE 3 multiple choice options

This command deletes rows
from a table.

SQL Statement: This CREATE TABLE 3 multiple choice options

statement makes a new
table by specifying the
table and column names.



During creation, each Data Type 2 multiple choice options

column is assigned a
____________ that indicates
the format of column values.
These can be numeric,
textual, or complex.


Data Type Question: INT 3 multiple choice options

This data type stores
integer values.

Data Type Question: This DECIMAL 3 multiple choice options

datatype stores fractional
numeric values.

Data Type Question: VARCHAR 3 multiple choice options

This datatype stores
textual values.

Data Type Question: This DATE 3 multiple choice options

datatype stores year,
month, and day.

Name for the first phase of Analysis 3 multiple choice options

database design.

Name for the second phase Logical Design 3 multiple choice options

of database design.

Physical Design 3 multiple choice options
Name for the third phase of
database design.