LATEST TEST WGU DATA-MANAGEMENT-FOUNDATIONS DISCOUNT - TEST DATA-MANAGEMENT-FOUNDATIONS PASS4SURE

Latest Test WGU Data-Management-Foundations Discount - Test Data-Management-Foundations Pass4sure

Latest Test WGU Data-Management-Foundations Discount - Test Data-Management-Foundations Pass4sure

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WGU Data Management – Foundations Exam Sample Questions (Q31-Q36):

NEW QUESTION # 31
What is information independence?

  • A. An ability to make changes to existing queries
  • B. An ability to change database type
  • C. An ability to interchange databases
  • D. An ability to change the organization of data

Answer: D

Explanation:
Information independencerefers to theseparation between data storage and data access. It allows a database'slogical structureto be modifiedwithout affecting existing applications.
Types of Information Independence:
* Logical Data Independence# Ability to change theconceptual schema(e.g., renaming columns, adding new attributes)without modifying applications.
* Physical Data Independence# Ability to change thephysical storage structure(e.g., indexing, partitioning)without affecting queries.
Example of Logical Data Independence:
* Anew columnis added to the Customers table, but existing queriesstill work without modification.
Example of Physical Data Independence:
* Data is moved to SSD storagefor performance improvement, but queriesrun the same way.
Why Other Options Are Incorrect:
* Option A (Incorrect):Changing thedatabase type(e.g., MySQL to PostgreSQL) isnotinformation independence.
* Option B (Incorrect):Making changes toqueriesis unrelated to database independence.
* Option C (Incorrect):Interchanging databases is related todata portability, notinformation independence.
Thus, the correct answer isD - An ability to change the organization of data, asinformation independence ensuresmodifications do not disrupt database operations.


NEW QUESTION # 32
What is the last step in the logical design process for designing a database?

  • A. Determine cardinality
  • B. Discover entities
  • C. Apply a normal form
  • D. Analyze data requirements

Answer: C

Explanation:
Thelogical design phasein database development focuses onstructuring data efficientlyto eliminate redundancy and ensure integrity. Thefinal step in logical designis toapply normalization (normal forms)to optimize the database schema.
Steps in Logical Database Design:
* Discover entities# Identify real-world objects (e.g., Customers, Orders).
* Determine cardinality# Define relationships between entities (one-to-one, one-to-many).
* Analyze data requirements# Determine the attributes each entity needs.
* Apply normal forms# Eliminate redundancy and improve data consistency.
Example Usage:
* After identifying entities likeStudentsandCourses, applying3rd Normal Form (3NF)ensures that data isorganized without redundancy.
Why Other Options Are Incorrect:
* Option A (Analyze data requirements) (Incorrect):Doneearlierto define attributes.
* Option C (Determine cardinality) (Incorrect):Donebeforenormalization to establish relationships.
* Option D (Discover entities) (Incorrect):Done at thebeginningof database design.
Thus, the correct answer isApply a normal form, as normalization is thelast step in logicaldesign.


NEW QUESTION # 33
What is the role of the transaction manager within the database system architecture?

  • A. The transaction manager uses information from the catalog to perform query optimization.
  • B. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
  • C. The transaction manager is composed of a query processor, storage manager, transaction manager, log, and catalog.
  • D. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.

Answer: D

Explanation:
ATransaction ManagerensuresACID (Atomicity, Consistency, Isolation, Durability)properties in database transactions. It manages concurrent transactions, ensuring no conflicts occur and logs modifications to support recovery mechanisms.
* Option A (Incorrect):Query optimization is managed by thequery processor, not the transaction manager.
* Option B (Incorrect):The transaction manager is a component of the database architecture but is not composed of the entire system (query processor, storage manager, etc.).
* Option C (Correct):The transaction manager logs transactions like INSERT, UPDATE, and DELETE, ensuring consistency and recoverability.
* Option D (Incorrect):Thestorage manageris responsible for translating queries into filesystem commands.


NEW QUESTION # 34
What is the second step in the implement relationships stage of database design?

  • A. Specify cascade
  • B. Implement one-one relationships
  • C. Implement subtype entities
  • D. Implement weak entities

Answer: B

Explanation:
Thesecond step in implementing relationshipsis definingone-to-one (1:1) relationshipsbetween entities.
Example Usage:
* Example of a 1:1 relationship:
sql
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE EmployeeDetails (
EmpID INT PRIMARY KEY,
Address VARCHAR(255),
FOREIGN KEY (EmpID) REFERENCES Employees(EmpID)
);
* Here, eachemployee has exactly one detail record, creating a1:1 relationship.
Why Other Options Are Incorrect:
* Option A (Implement weak entities) (Incorrect):Weak entities rely on aforeign keyand are implementedlater.
* Option C (Implement subtype entities) (Incorrect):Subtypes arespecial casesandnot implemented in the second step.
* Option D (Specify cascade) (Incorrect):Cascade rules (ON DELETE, ON UPDATE)are defined duringforeign key implementation, not in the second step.
Thus, the correct answer isImplement one-one relationships, as it is thenext logical stepafter defining entities.


NEW QUESTION # 35
Which capability should databases maintain to simplify the use of SQL with a general-purpose language?

  • A. The query processor to deliver results
  • B. The ability to reverse results if needed
  • C. The use of an application programming interface
  • D. The storage manager to interpret low-level file-system commands

Answer: C

Explanation:
Databases need to supportApplication Programming Interfaces (APIs)to enable seamless integration with general-purpose programming languageslike Python, Java, and C#. APIs likeODBC (Open Database Connectivity) and JDBC (Java Database Connectivity)allow applications to interact with databases without requiring complex SQL commands.
* Option A (Incorrect):Thestorage manageris responsible for managing low-levelfile system operations, but it does not simplify SQL integration with programming languages.
* Option B (Incorrect):The ability toreverse results(e.g., using ORDER BY DESC) is a SQL feature but is unrelated to integration with programming languages.
* Option C (Incorrect):Thequery processoroptimizes and executes SQL queries but does not provide an interface for application development.
* Option D (Correct):APIsallow databases to be accessed easily from different programming environments, simplifying integration.


NEW QUESTION # 36
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