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WGU - D426: OBJECTIVE ASSESSMENT QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 2024
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WGU - D426: OBJECTIVE ASSESSMENT QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS 2024
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WGU - D426: OBJECTIVE ASSESSMENTQUESTIONS AND ANSWERS WITH
VERIFIED SOLUTIONS 2024
Database Application - ANSWER Software that helps business users interact with database systems.
Database Administrator - ANSWER Responsible for securing the database system against unauthorized
users. A database administrator enforces procedures for user access and database system availability.
Authorization - ANSWER 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 - ANSWER Database systems ensure data is consistent with structural and business rules.
Query Processor - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER Data about the database, such as column names and the number of rows in each
table.
Relational Database - ANSWER Stores data in tables, columns, and rows, similar to a spreadsheet.
Relational Database - ANSWER All _________ ________ systems support the SQL query language.
,Relational Database - ANSWER 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) - ANSWER The newer non-relational systems are called NoSQL, for 'not only SQL', and
are optimized for big data.
SQL Statements - ANSWER 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) - ANSWER 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 - ANSWER INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - ANSWER Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database Design) - ANSWER 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) - ANSWER 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 - ANSWER 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.
Data Independence - ANSWER Allows database designers to tune query performance without changes to
application programs.
Application Programming Interface (API) - ANSWER To simplify the use of SQL with a general-purpose
language, database programs typically use an ____________ _____________ _______________.
MySQL Command-Line Client - ANSWER A text interface included in the MySQL Server download.
MySQL - ANSWER 'World' database, a database that is usually installed with ______.
Error Code - ANSWER MySQL Server returns an _____ ____ and description when an SQL statement is
syntactically incorrect or the database cannot execute the statement.
Database Model - ANSWER Data structures that prescribe how data is organized.
Operations that manipulate data structures.
Rules that govern valid data.
Tuple - ANSWER An ORDERED collection of elements enclosed in parentheses.
Table - ANSWER A _____ has a name, a fixed tuple of columns, and a varying set of rows.
Column - ANSWER A ______ has a name and a data type.
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