WGU - D426: Objective
Assessment question
and answer
(2025/2026)
Database Application - correct answersSoftware that helps business users interact with
database systems.
Database Administrator - correct answersResponsible for securing the database system against
unauthorized users. A database administrator enforces procedures for user access and database
system availability.
Authorization - correct answersMany database users should have limited access to specific
tables, columns, or rows of a database. Database systems authorize individual users to access
specific data.
Rules - correct answersDatabase systems ensure data is consistent with structural and business
rules.
,Query Processor - correct answersInterprets 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.
Storage Manager - correct answersTranslates 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.
Transaction Manager - correct answersEnsures 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 - correct answersData about the database, such as column names and the number of
rows in each table.
Relational Database - correct answersStores data in tables, columns, and rows, similar to a
spreadsheet.
Relational Database - correct answersAll _________ ________ systems support the SQL query
language.
Relational Database - correct answersRelational systems are ideal for databases that require an
accurate record of every transaction, such as banking, airline reservation systems, and student
records.
MongoDB (NoSQL) - correct answersThe newer non-relational systems are called NoSQL, for
'not only SQL', and are optimized for big data.
SQL Statements - correct answersINSERT 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) - correct answersA 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 - correct answersINT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - correct answersAnalysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) - correct
answersThis 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) - correct answersThis 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 - correct answersSpecifies 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 - correct answersAllows database designers to tune query performance
without changes to application programs.
Assessment question
and answer
(2025/2026)
Database Application - correct answersSoftware that helps business users interact with
database systems.
Database Administrator - correct answersResponsible for securing the database system against
unauthorized users. A database administrator enforces procedures for user access and database
system availability.
Authorization - correct answersMany database users should have limited access to specific
tables, columns, or rows of a database. Database systems authorize individual users to access
specific data.
Rules - correct answersDatabase systems ensure data is consistent with structural and business
rules.
,Query Processor - correct answersInterprets 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.
Storage Manager - correct answersTranslates 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.
Transaction Manager - correct answersEnsures 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 - correct answersData about the database, such as column names and the number of
rows in each table.
Relational Database - correct answersStores data in tables, columns, and rows, similar to a
spreadsheet.
Relational Database - correct answersAll _________ ________ systems support the SQL query
language.
Relational Database - correct answersRelational systems are ideal for databases that require an
accurate record of every transaction, such as banking, airline reservation systems, and student
records.
MongoDB (NoSQL) - correct answersThe newer non-relational systems are called NoSQL, for
'not only SQL', and are optimized for big data.
SQL Statements - correct answersINSERT 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) - correct answersA 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 - correct answersINT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - correct answersAnalysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) - correct
answersThis 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) - correct answersThis 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 - correct answersSpecifies 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 - correct answersAllows database designers to tune query performance
without changes to application programs.
