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WGU D 426 OBJECTIVE ASSESSMENT EXAM LATEST VERSION -
2025/2026- 100+ QUESTIONS AND VERIFIED ANSWERS ALL
THE BEST
Query Processor
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.
Rules
Database systems ensure data is consistent with structural and business rules.
Storage Manager
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.
Database Application
Software that helps business users interact with database systems.
Database Administrator
Responsible for securing the database system against unauthorized users. A
database administrator 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. Database systems authorize individual users to access specific
data.
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Transaction 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.
Metadata
Data about the database, such as column names and the number of rows in each
table.
Relational Database
Stores data in tables, columns, and rows, similar to a spreadsheet.
Relational Database
All _________ ________ systems support the SQL query language.
Relational Database
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)
The newer non-relational systems are called NoSQL, for 'not only SQL', and are
optimized for big data.
SQL Statements
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)
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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
INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design
Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database
Design)
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)
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
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.
WGU D 426 OBJECTIVE ASSESSMENT EXAM LATEST VERSION -
2025/2026- 100+ QUESTIONS AND VERIFIED ANSWERS ALL
THE BEST
Query Processor
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.
Rules
Database systems ensure data is consistent with structural and business rules.
Storage Manager
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.
Database Application
Software that helps business users interact with database systems.
Database Administrator
Responsible for securing the database system against unauthorized users. A
database administrator 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. Database systems authorize individual users to access specific
data.
, 2
Transaction 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.
Metadata
Data about the database, such as column names and the number of rows in each
table.
Relational Database
Stores data in tables, columns, and rows, similar to a spreadsheet.
Relational Database
All _________ ________ systems support the SQL query language.
Relational Database
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)
The newer non-relational systems are called NoSQL, for 'not only SQL', and are
optimized for big data.
SQL Statements
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)
, 3
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
INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design
Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database
Design)
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)
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
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.
