WGU D027 OBJECTIVE ASSESSMENT 2026
PROFESSIONAL COMPETENCY EXAM
◉ Database Administrator. Answer: Responsible for securing the
database system against unauthorized users. A database
administrator enforces procedures for user access and database
system availability.
◉ Authorization. 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.
◉ Rules. Answer: Database systems ensure data is consistent with
structural and business rules.
◉ Query Processor. 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.
◉ Storage Manager. 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.
,◉ Transaction Manager. 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.
◉ Metadata. Answer: Data about the database, such as column
names and the number of rows in each table.
◉ Relational Database. Answer: Stores data in tables, columns, and
rows, similar to a spreadsheet.
◉ Relational Database. Answer: All _________ ________ systems support
the SQL query language.
◉ Relational Database. Answer: 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). Answer: The newer non-relational systems
are called NoSQL, for 'not only SQL', and are optimized for big data.
◉ SQL Statements. 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.
◉ CREATE TABLE (Statement). 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.
◉ Data Type. Answer: INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
◉ Database Design. Answer: Analysis
Logical design
Physical design
◉ Analysis Phase, Conceptual Design, Entity-Relationship Modeling
(Database Design). 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
PROFESSIONAL COMPETENCY EXAM
◉ Database Administrator. Answer: Responsible for securing the
database system against unauthorized users. A database
administrator enforces procedures for user access and database
system availability.
◉ Authorization. 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.
◉ Rules. Answer: Database systems ensure data is consistent with
structural and business rules.
◉ Query Processor. 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.
◉ Storage Manager. 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.
,◉ Transaction Manager. 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.
◉ Metadata. Answer: Data about the database, such as column
names and the number of rows in each table.
◉ Relational Database. Answer: Stores data in tables, columns, and
rows, similar to a spreadsheet.
◉ Relational Database. Answer: All _________ ________ systems support
the SQL query language.
◉ Relational Database. Answer: 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). Answer: The newer non-relational systems
are called NoSQL, for 'not only SQL', and are optimized for big data.
◉ SQL Statements. 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.
◉ CREATE TABLE (Statement). 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.
◉ Data Type. Answer: INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
◉ Database Design. Answer: Analysis
Logical design
Physical design
◉ Analysis Phase, Conceptual Design, Entity-Relationship Modeling
(Database Design). 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
