WGU-D426 OBJECTIVE ASSESSMENT WITH
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS| CURRENTLY
TESTING VERSION | ALREADY GRADED
A+|NEWEST|EXPERT VERIFIED FOR
GUARANTEED PASS
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
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,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
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, 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.
Data Independence
Allows database designers to tune query performance without changes to application
programs.
Application Programming Interface (API)
To simplify the use of SQL with a general-purpose language, database programs
typically use an ____________ _____________ _______________.
3|Page
ACTUAL CORRECT QUESTIONS AND
VERIFIED DETAILED ANSWERS| CURRENTLY
TESTING VERSION | ALREADY GRADED
A+|NEWEST|EXPERT VERIFIED FOR
GUARANTEED PASS
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
1|Page
,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
2|Page
, 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.
Data Independence
Allows database designers to tune query performance without changes to application
programs.
Application Programming Interface (API)
To simplify the use of SQL with a general-purpose language, database programs
typically use an ____________ _____________ _______________.
3|Page
