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D426 WGU EXAM / WGU D426 LATEST EXAM STUDY GUIDE ACTUAL EXAM QUESTIONS AND WELL ELABORATED ANSWERS
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D426 WGU EXAM / WGU D426 LATEST EXAM STUDY GUIDE ACTUAL EXAM QUESTIONS AND WELL ELABORATED ANSWERS

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  • October 7, 2024
  • 21
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • d426 wgu exam wgu d426 latest exam study guide
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WGU D426 LESSON 1,2,3,4 AND 5 LATEST
2024 WITH COMPLETE SOLUTION

DECIMAL (Query Languages) - Stores fractional numeric values


VARCHAR (Query Languages) - stores textual values


DATE (Query Languages) - Stores year, month, and day


Analysis (Database Design) - outlines database requirements, categorized into entities,
relationships, and attributes, without mentioning a specific database system.


Conceptual Design, Entity-Relationship modeling & Requirements definition are also known as
.... ? - The Analysis Phase


Rectangles represent... - entities


Logical (Database Design) - implements database requirements in a specific database
system. For relational database systems, logical design converts entities, relationships, and
attributes into tables, keys, and columns


Physical (Database Design) - adds indexes and specifies how tables are organized on storage
media.


data independence (Database Design) - The principle that physical design never affects
query results


MySQL Command-Line Client (MYSQL) - a text interface included in the MySQL Server
download.


error code (MYSQL) - when an SQL statement is syntactically incorrect or the database
cannot execute the statement.

,WGU D426 Lesson 2. Relational
Databases
Data structures (Relational Model) - prescribe how data is organized.


tuple (Relational Model) - an ordered collection of elements enclosed in parentheses. Ex: (a,
b, c) and (c, b, a) are different, since tuples are ordered.


Rules (Relational Model) - that govern valid data


table (Relational Model) - has a name, a fixed tuple of columns, and a varying set of rows.


database application (Database Basics) - software that helps business users interact with
database systems.


Database Administrator (Database Basics) - Database Roles: A database administrator is
responsible for safeguarding the database system against unauthorized access and enforcing
procedures for user access and system availability.


database designer (Database Basics) - determines the format of each data element and the
overall database structure.


Authorization (Database Systems) - 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 (Database Systems) - Database systems ensure data is consistent with structural and
business rules.

, Query Processor (Database Systems) - interprets queries, creates a plan to modify the
database or retrieve data, and returns query results to the application


The query processor performs... (Database Systems) - query optimization to ensure the most
efficient instructions are executed on the data.


storage manager (Database Systems) - translates the query processor instructions into low-
level file system commands that modify or retrieve data.


indexes (Database Systems) - Database sizes range from megabytes to many terabytes, so
the storage manager uses indexes to quickly locate data.


transaction manager (Database Systems) - The transaction manager ensures efficient
transaction execution, prevents conflicts between concurrent transactions, and restores the
database to a consistent state in case of a transaction or system failure.


Metadata (Database Systems) - is data about the database, such as column names and the
number of rows in each table.


relational database - stores data in tables, columns, and rows, similar to a spreadsheet.


All relational database systems support the - SQL query language.


Relational systems are ideal for databases that require.... - an accurate record of every
transaction, such as banking, airline reservation systems, and student records.


What are the newer nonrelational systems called ? - NoSQL


INSERT (Query Languages) - Inserts rows into a table


SELECT (Query Languages) - Retrieves data from a table


UPDATE (Query Languages) - Modifies data in a table

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