WGU - D426: OBJECTIVE ASSESSMENT QUESTIONS
| TESTED AND PROVEN ANSWERS | LATEST
UPDATE 2024/2025 100% (GRADE A+)
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.
1
,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.
2
,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
3
, 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.
4
| TESTED AND PROVEN ANSWERS | LATEST
UPDATE 2024/2025 100% (GRADE A+)
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.
1
,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.
2
,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
3
, 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.
4
