WGU D426 EXAM SCRIPT 2026 VIEW AHEAD
TESTED QUESTIONS AND SOLUTIONS.
◍ Analog Data.Answer:Most common before computers. Audio was
recorded as vibrations impressed on vinyl disks.
◍ Digital Data.Answer:Most common today. Encoded as 0s and 1s on
electronic magnetic data.
◍ Database.Answer:A collection of data in structured format. In
principle, can be stored on paper or even clay tablets.
◍ Database System (DBMS).Answer:Software that reads and writes
in a database.
◍ Query.Answer:A request to retrieve or change data in a database.
Typically inserts new data, retrieves data, updates, data, or deletes
data from a database.
◍ Query Language.Answer:Specialized programming language
designed specifically for database systems. Reads and writes data
efficiently.
◍ Database Application.Answer:Software that HELPS business users
interact with database systems.
,◍ Database Administrator.Answer:What role am I?
Responsible for securing the database system against unauthorized
users. They enforce procedures for user access and database system
availability.
◍ Database Designer.Answer:What role am I?
Determines the format of each data element AND the overall database
STRUCTURE. Must balance priorities like including storage,
response time, and support for rules that govern the data.
◍ Database Programmer.Answer:What role am I?
Develop programs that utilize a database and write applications that
combine query languages and general purpose programming
language.
◍ Database User.Answer:What role am I?
A consumer of data in a database. They request, update, or use stored
data to generate reports or information.
◍ Transaction.Answer:A group of queries that MUST be completed
or rejected as a whole.
, ◍ Architecture.Answer:Describes the internal components AND the
relationships between components.
◍ Query Processor.Answer:Interprets queries, creates a plan to
modify the database or retrieve the data, and returns query results to
the application. Performs query optimization.
◍ Query Optimization.Answer:Ensures efficient instructions are
executed on the data from the Query Processor.
◍ Storage Manager.Answer:Translates the query processor
instructions into low-level file-system commands that modify OR
retrieve data. Uses indexes to quickly locate data.
◍ Transaction Manager.Answer:Ensures transactions are properly
executed. Prevents conflicts between concurrent transactions. Also
restores the database to a consistent state in the event of a failure.
◍ Log.Answer:A file containing a complete record of ALL inserts,
updates, and deletes processed by the database. The records can be
used to restore a database.
◍ Catalog/Data Dictionary/Repository.Answer:A directory of tables,
columns, indexes, and other database objects.
TESTED QUESTIONS AND SOLUTIONS.
◍ Analog Data.Answer:Most common before computers. Audio was
recorded as vibrations impressed on vinyl disks.
◍ Digital Data.Answer:Most common today. Encoded as 0s and 1s on
electronic magnetic data.
◍ Database.Answer:A collection of data in structured format. In
principle, can be stored on paper or even clay tablets.
◍ Database System (DBMS).Answer:Software that reads and writes
in a database.
◍ Query.Answer:A request to retrieve or change data in a database.
Typically inserts new data, retrieves data, updates, data, or deletes
data from a database.
◍ Query Language.Answer:Specialized programming language
designed specifically for database systems. Reads and writes data
efficiently.
◍ Database Application.Answer:Software that HELPS business users
interact with database systems.
,◍ Database Administrator.Answer:What role am I?
Responsible for securing the database system against unauthorized
users. They enforce procedures for user access and database system
availability.
◍ Database Designer.Answer:What role am I?
Determines the format of each data element AND the overall database
STRUCTURE. Must balance priorities like including storage,
response time, and support for rules that govern the data.
◍ Database Programmer.Answer:What role am I?
Develop programs that utilize a database and write applications that
combine query languages and general purpose programming
language.
◍ Database User.Answer:What role am I?
A consumer of data in a database. They request, update, or use stored
data to generate reports or information.
◍ Transaction.Answer:A group of queries that MUST be completed
or rejected as a whole.
, ◍ Architecture.Answer:Describes the internal components AND the
relationships between components.
◍ Query Processor.Answer:Interprets queries, creates a plan to
modify the database or retrieve the data, and returns query results to
the application. Performs query optimization.
◍ Query Optimization.Answer:Ensures efficient instructions are
executed on the data from the Query Processor.
◍ Storage Manager.Answer:Translates the query processor
instructions into low-level file-system commands that modify OR
retrieve data. Uses indexes to quickly locate data.
◍ Transaction Manager.Answer:Ensures transactions are properly
executed. Prevents conflicts between concurrent transactions. Also
restores the database to a consistent state in the event of a failure.
◍ Log.Answer:A file containing a complete record of ALL inserts,
updates, and deletes processed by the database. The records can be
used to restore a database.
◍ Catalog/Data Dictionary/Repository.Answer:A directory of tables,
columns, indexes, and other database objects.
