WGU - D426: Objective Assessment questions with
verified answers
Database Application Ans ✔✔-Software that helps business users interact
with database systems.
Database Administrator Ans ✔✔-Responsible for securing the database
system against unauthorized users. A database administrator enforces
procedures for user access and database system availability.
Authorization Ans ✔✔-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 Ans ✔✔-Database systems ensure data is consistent with structural
and business rules.
Query Processor Ans ✔✔-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 Ans ✔✔-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 Ans ✔✔-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 Ans ✔✔-Data about the database, such as column names and
the number of rows in each table.
Relational Database Ans ✔✔-Stores data in tables, columns, and rows,
similar to a spreadsheet.
Relational Database Ans ✔✔-All _________ ________ systems support
the SQL query language.
Relational Database Ans ✔✔-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) Ans ✔✔-The newer non-relational systems are
called NoSQL, for 'not only SQL', and are optimized for big data.
SQL Statements Ans ✔✔-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) Ans ✔✔-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 Ans ✔✔-INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design Ans ✔✔-Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling
(Database Design) Ans ✔✔-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) Ans ✔✔-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.
verified answers
Database Application Ans ✔✔-Software that helps business users interact
with database systems.
Database Administrator Ans ✔✔-Responsible for securing the database
system against unauthorized users. A database administrator enforces
procedures for user access and database system availability.
Authorization Ans ✔✔-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 Ans ✔✔-Database systems ensure data is consistent with structural
and business rules.
Query Processor Ans ✔✔-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 Ans ✔✔-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 Ans ✔✔-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 Ans ✔✔-Data about the database, such as column names and
the number of rows in each table.
Relational Database Ans ✔✔-Stores data in tables, columns, and rows,
similar to a spreadsheet.
Relational Database Ans ✔✔-All _________ ________ systems support
the SQL query language.
Relational Database Ans ✔✔-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) Ans ✔✔-The newer non-relational systems are
called NoSQL, for 'not only SQL', and are optimized for big data.
SQL Statements Ans ✔✔-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) Ans ✔✔-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 Ans ✔✔-INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day.
Database Design Ans ✔✔-Analysis
Logical design
Physical design
Analysis Phase, Conceptual Design, Entity-Relationship Modeling
(Database Design) Ans ✔✔-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) Ans ✔✔-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.
