Data Management - Foundations - D426 WGU Exam Study Guide
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Course
2024/2025
Institution
2024/2025
Data Management - Foundations - D426
WGU Exam Study Guide
Data - Answer-Numeric, textual, visual, or audio information that describes real-world
systems. It is collected and processed to aid in a variety of tasks.
Analog Data - Answer-Most common before computers. Audio was recorded as vibratio...
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.
Relational Database - Answer✔✔-Stores data in tables, columns, and rows, SIMILAR to a
spreadsheet. It also supports SQL. Made up of relations.
NoSQL - Answer✔✔-A new generation of DBMS that is NOT based on the traditional relational
database model.
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