WGU D426 Objective Assessment Exam Questions and Correct Answers 100% Verified
Graded A+
Database Application - Software that helps business users interact with database systems.
Database Administrator - Responsible for securing the database system against
unauthorized users. A database administrator enforces procedures for user access and database
system availability.
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.
Rules - Database systems ensure data is consistent with structural and business rules.
Query Processor - 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 - 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 - 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 - 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.
Relational Database - All _________ ________ systems support the SQL query language.
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.
MongoDB (NoSQL) - The newer non-relational systems are called NoSQL, for 'not only
SQL', and are optimized for big data.
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.
CREATE TABLE (Statement) - 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 - INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database 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.
Logical Design (Database Design) - 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 - 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.
Graded A+
Database Application - Software that helps business users interact with database systems.
Database Administrator - Responsible for securing the database system against
unauthorized users. A database administrator enforces procedures for user access and database
system availability.
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.
Rules - Database systems ensure data is consistent with structural and business rules.
Query Processor - 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 - 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 - 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 - 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.
Relational Database - All _________ ________ systems support the SQL query language.
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.
MongoDB (NoSQL) - The newer non-relational systems are called NoSQL, for 'not only
SQL', and are optimized for big data.
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.
CREATE TABLE (Statement) - 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 - INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design - Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling (Database 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.
Logical Design (Database Design) - 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 - 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.
