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WGU D426 Objective Assessment Questions and Answers (2024 / 2025) (Verified Answers)
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WGU D426 Objective Assessment Questions and Answers (2024 / 2025) (Verified Answers)
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WGU D426 Objective Assessment1. Database Application: Software that helps business users interact
with data- base systems.
2. Database Administrator: Responsible for securing the database system
against unauthorized users. A database administrator enforces
procedures for user access and database system availability.
3. Authorization: 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.
4. Rules: Database systems ensure data is consistent with structural and
business rules.
5. Query Processor: Interprets queries, creates a plan to modify the
database or retrieve data, and returns query results to the application.
Performs query optimiza- tion to ensure the most efficient instructions
,are executed on the data.
6. Storage Manager: 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.
7. Transaction Manager: Ensures transactions are properly executed. The
transac- tion 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.
8. Metadata: Data about the database, such as column names and the
number of rows in each table.
9. Relational Database: Stores data in tables, columns, and rows,
similar to a spreadsheet.
10.Relational Database: All systems support the SQL
query language.
,11.Relational Database: Relational systems are ideal for databases that
require an accurate record of every transaction, such as banking, airline
reservation systems, and student records.
12.MongoDB (NoSQL): The newer non-relational systems are called
NoSQL, for 'not only SQL', and are optimized for big data.
13.SQL Statements: INSERT inserts rows into a
table. SELECT retrieves data from a table.
UPDATE modifies data in a
table. DELETE deletes rows
from a table.
14.CREATE TABLE (Statement): A statement that creates a new table by
specify- ing 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.
, 15.Data Type: INT stores integer
values. DECIMAL stores fractional
numeric values. VARCHAR stores
textual values.
DATE stores year, month, and day.
16.Database Design:
Analysis Logical design
Physical design
17.Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Data-
base Design): 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.
18.Logical Design (Database Design): This phase implements database
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