WGU D426 OBJECTIVE ASSESSMENT 2 LATEST VERSIONS 2024 ACTUAL EXAM
COMPLETE 400 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Database Application - correct one-Software that helps business users interact
with database systems.
Database Administrator - correct one-Responsible for securing the database
system against unauthorized users. A database administrator enforces
procedures for user access and database system availability.
Authorization - correct one-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 - correct one-Database systems ensure data is consistent with structural
and business rules.
Query Processor - correct one-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 - correct one-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 - correct one-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 - correct one-Data about the database, such as column names and the
number of rows in each table.
Relational Database - correct one-Stores data in tables, columns, and rows,
similar to a spreadsheet.
Relational Database - correct one-All _________ ________ systems support the
SQL query language.
Relational Database - correct one-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) - correct one-The newer non-relational systems are called
NoSQL, for 'not only SQL', and are optimized for big data.
SQL Statements - correct one-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) - correct one-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 - correct one-INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database
Design) - correct one-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) - correct one-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 - correct one-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.
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