RELIABLE DATA-MANAGEMENT-FOUNDATIONS EXAM TOPICS, PDF DATA-MANAGEMENT-FOUNDATIONS FILES

Reliable Data-Management-Foundations Exam Topics, Pdf Data-Management-Foundations Files

Reliable Data-Management-Foundations Exam Topics, Pdf Data-Management-Foundations Files

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Tags: Reliable Data-Management-Foundations Exam Topics, Pdf Data-Management-Foundations Files, Data-Management-Foundations Test Questions Pdf, Data-Management-Foundations Reliable Test Duration, Data-Management-Foundations Exam Objectives

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WGU Data Management – Foundations Exam Sample Questions (Q21-Q26):

NEW QUESTION # 21
Which main characteristic is used to differentiate between strong and weak entities in the process of database design?

  • A. Primary key
  • B. Association
  • C. Foreign key
  • D. Cardinality

Answer: A

Explanation:
Indatabase design, an entity is classified asstrong or weakbased on whether it has aprimary keythat uniquely identifies its records.
Differences Between Strong and Weak Entities:

CREATE TABLE Orders (
OrderID INT PRIMARY KEY,
CustomerID INT
);
CREATE TABLE OrderDetails (
OrderDetailID INT,
OrderID INT,
ProductID INT,
PRIMARY KEY (OrderDetailID, OrderID),
FOREIGN KEY (OrderID) REFERENCES Orders(OrderID)
);
* Orders is astrong entity(has OrderID as its own primary key).
* OrderDetails is aweak entity(depends on OrderID for uniqueness).
Why Other Options Are Incorrect:
* Option A (Association) (Incorrect):Associations describerelationshipsbut do not define strong/weak entities.
* Option C (Foreign key) (Incorrect):Weak entitiesdepend on foreign keys, butprimary keysdefine their status.
* Option D (Cardinality) (Incorrect):Cardinality definesrelationship constraintsbut doesnot differentiate entity types.
Thus, the correct answer isPrimary key, as it is the defining characteristic betweenstrong and weak entities.


NEW QUESTION # 22
Which statement is associated with two separate entities?

  • A. Entity type
  • B. Reflexive relationship
  • C. Attribute
  • D. Relationship

Answer: D

Explanation:
Arelationshipin an ER model defineshow two separate entities interact.
Example Usage:
A screenshot of a computer AI-generated content may be incorrect.

CREATE TABLE Customers (
CustomerID INT PRIMARY KEY,
Name VARCHAR(50)
);
CREATE TABLE Orders (
OrderID INT PRIMARY KEY,
CustomerID INT,
FOREIGN KEY (CustomerID) REFERENCES Customers(CustomerID)
);
* Customers and Orders are separate entities, related via CustomerID.
Why Other Options Are Incorrect:
* Option A (Reflexive relationship) (Incorrect):Used forself-referencing entities, not two different entities.
* Option B (Entity type) (Incorrect):Defines aclass of objects, but does not establish relationships.
* Option D (Attribute) (Incorrect):Attributesdescribeentities but do not connect them.
Thus, the correct answer isRelationship, as it connectstwo separate entities.


NEW QUESTION # 23
Which database operation locates the needed table blocks?

  • A. Fan-out
  • B. Table scan
  • C. Binary search
  • D. Index scan

Answer: D

Explanation:
Anindex scanis a database operation thatquickly locates table blocksusing anindexrather than scanning the entire table. It significantly improves query performance.
Example Usage:
sql
SELECT * FROM Employees WHERE EmployeeID = 105;
* If EmployeeID isindexed, the database uses anindex scantoquickly find the record.
Why Other Options Are Incorrect:
* Option A (Binary search) (Incorrect):A searching algorithm, but not a database operation.
* Option B (Table scan) (Incorrect):Scans theentire table, which isslowerthan an index scan.
* Option C (Fan-out) (Incorrect):Refers tobranching in B-Treesbut doesnot locate table blocks directly.
Thus, the correct answer isIndex scan, as it efficiently locates table blocks.


NEW QUESTION # 24
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 is composed of a query processor, storage manager, transaction manager, log, and catalog.
  • C. The transaction manager translates the query processor instructions into filesystem commands and uses an index to quickly locate the requested data.
  • D. The transaction manager logs insert, update, and delete queries, and the result is sent back to the application.

Answer: D


NEW QUESTION # 25
What is information independence?

  • A. An ability to change database type
  • B. An ability to interchange databases
  • C. An ability to make changes to existing queries
  • 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 # 26
......

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