WGU - D426: Objective Assessment
Exam-Graded A
Software that helps business users interact with database systems. - ANSWER-
Database Application
Responsible for securing the database system against unauthorized users. A database
administrator enforces procedures for user access and database system availability. -
ANSWER-Database Administrator
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. -
ANSWER-Authorization
Database systems ensure data is consistent with structural and business rules. -
ANSWER-Rules
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. - ANSWER-Query Processor
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. - ANSWER-Storage 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. - ANSWER-
Transaction Manager
Data about the database, such as column names and the number of rows in each table.
- ANSWER-Metadata
Stores data in tables, columns, and rows, similar to a spreadsheet. - ANSWER-
Relational Database
All _________ ________ systems support the SQL query language. - ANSWER-
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. -
ANSWER-Relational Database
The newer non-relational systems are called NoSQL, for 'not only SQL', and are
optimized for big data. - ANSWER-MongoDB (NoSQL)
INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
DELETE deletes rows from a table. - ANSWER-SQL Statements
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. - ANSWER-CREATE TABLE (Statement)
INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day. - ANSWER-Data Type
Analysis
Logical design
Physical design - ANSWER-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. - ANSWER-Analysis Phase,
Conceptual Design, Entity-Relationship Modeling (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. - ANSWER-Logical Design (Database 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. - ANSWER-Physical Design
Allows database designers to tune query performance without changes to application
programs. - ANSWER-Data Independence
The ________ operator provides an alternative way to determine if a value is between
two other values. - ANSWER-BETWEEN (Operator)
Exam-Graded A
Software that helps business users interact with database systems. - ANSWER-
Database Application
Responsible for securing the database system against unauthorized users. A database
administrator enforces procedures for user access and database system availability. -
ANSWER-Database Administrator
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. -
ANSWER-Authorization
Database systems ensure data is consistent with structural and business rules. -
ANSWER-Rules
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. - ANSWER-Query Processor
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. - ANSWER-Storage 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. - ANSWER-
Transaction Manager
Data about the database, such as column names and the number of rows in each table.
- ANSWER-Metadata
Stores data in tables, columns, and rows, similar to a spreadsheet. - ANSWER-
Relational Database
All _________ ________ systems support the SQL query language. - ANSWER-
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. -
ANSWER-Relational Database
The newer non-relational systems are called NoSQL, for 'not only SQL', and are
optimized for big data. - ANSWER-MongoDB (NoSQL)
INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
DELETE deletes rows from a table. - ANSWER-SQL Statements
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. - ANSWER-CREATE TABLE (Statement)
INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day. - ANSWER-Data Type
Analysis
Logical design
Physical design - ANSWER-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. - ANSWER-Analysis Phase,
Conceptual Design, Entity-Relationship Modeling (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. - ANSWER-Logical Design (Database 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. - ANSWER-Physical Design
Allows database designers to tune query performance without changes to application
programs. - ANSWER-Data Independence
The ________ operator provides an alternative way to determine if a value is between
two other values. - ANSWER-BETWEEN (Operator)
