WGU - D426: Objective Assessment Exam Questions With Correct Answers
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Course
WGU D426
Institution
WGU D426
WGU - D426: Objective Assessment Exam
Questions With Correct Answers
Database Application - answerSoftware that helps business users interact with database
systems.
Database Administrator - answerResponsible for securing the database system against
unauthorized users. A database administrator ...
BRIGHTSTARS EXAM STUDY SOLUTIONS 8/15/2024 2:05 PM
WGU - D426: Objective Assessment Exam
Questions With Correct Answers
Database Application - answer✔✔Software that helps business users interact with database
systems.
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.
, BRIGHTSTARS EXAM STUDY SOLUTIONS 8/15/2024 2:05 PM
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 relationship is a link between entities, and an attribute is a
descriptive property of an entity.
Logical Design (Database Design) - answer✔✔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 - answer✔✔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.
Data Independence - answer✔✔Allows database designers to tune query performance without
changes to application programs.
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