AUTHORIZED DATA-MANAGEMENT-FOUNDATIONS PDF, EXAM DATA-MANAGEMENT-FOUNDATIONS ANSWERS

Authorized Data-Management-Foundations Pdf, Exam Data-Management-Foundations Answers

Authorized Data-Management-Foundations Pdf, Exam Data-Management-Foundations Answers

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Tags: Authorized Data-Management-Foundations Pdf, Exam Data-Management-Foundations Answers, Data-Management-Foundations Cheap Dumps, Data-Management-Foundations Free Braindumps, Braindumps Data-Management-Foundations Torrent

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WGU Data Management – Foundations Exam Sample Questions (Q50-Q55):

NEW QUESTION # 50
What is the role of a query processor in the database system architecture?

  • A. It uses information from the catalog to perform query optimization.
  • B. It translates instructions into file system commands.
  • C. It sends results back to the application that requested the queries.
  • D. It writes log records before applying changes to the database.

Answer: A

Explanation:
Aquery processoris responsible forquery optimization and executionin a database management system (DBMS). It analyzes SQL statements, optimizes execution plans, and ensures efficient retrieval of data.
* Option A (Correct):Thequery processoroptimizes queries by analyzing metadata from thesystem catalogto determine the best execution strategy.
* Option B (Incorrect):Logging transactionsbefore applying changes is the responsibility of the transaction manager.
* Option C (Incorrect):Translating instructions intofile system commandsis handled by thestorage manager, not the query processor.
* Option D (Incorrect):While the query processor helps retrieve results, thedatabaseengineandAPI layerare responsible for returning results to applications.


NEW QUESTION # 51
Which function measures a numeric value's distance from 0?

  • A. CONCAT
  • B. ABS
  • C. FROM
  • D. LOWER

Answer: B

Explanation:
TheABS()function in SQL returns theabsolute valueof a given number, effectively measuring itsdistance from zero.
Example Usage:
sql
SELECT ABS(-50), ABS(50);
Result:
50 | 50
* This function ensures that numbers arealways positive, regardless of their original sign.
Why Other Options Are Incorrect:
* Option A (CONCAT) (Incorrect):Used tocombine strings(not numbers).
* Option B (LOWER) (Incorrect):Converts text tolowercase, not numerical operations.
* Option C (FROM) (Incorrect):Part of SELECT FROM queries,not a function.
Thus, the correct choice isABS(), which computes the absolute value of a number.


NEW QUESTION # 52
Which clause or statement in a CREATE statement ensures a certain range of data?

  • A. CHECK
  • B. SET
  • C. WHERE
  • D. FROM

Answer: A

Explanation:
TheCHECKconstraint is used in SQL toenforce ruleson a column's values. It ensures that data inserted into a table meets specified conditions, such as range restrictions or logical rules.
Example Usage:
sql
CREATE TABLE Employees (
ID INT PRIMARY KEY,
Name VARCHAR(50),
Salary INT CHECK (Salary BETWEEN 30000 AND 150000)
);
* This constraint ensures thatsalary values fall between 30,000 and 150,000.
* If an INSERT or UPDATE statement tries to set Salary = 20000, itfailsbecause it does notmeet the CHECK condition.
Why Other Options Are Incorrect:
* Option B (FROM) (Incorrect):Used in SELECT statements, not for constraints.
* Option C (WHERE) (Incorrect):Filters rows in queries butdoes not enforce constraints.
* Option D (SET) (Incorrect):Used for updating records (UPDATE table_name SET column = value) butnot for defining constraints.
Thus,CHECK is the correct answer, as it ensures that column values remain within an expected range.


NEW QUESTION # 53
What is information independence?

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

Answer: C

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 # 54
Which term refers to a path from a top-level block to a bottom-level block?

  • A. Sparse index
  • B. Fan-out
  • C. Branch
  • D. Crow's foot

Answer: C

Explanation:
In database indexing, abranchrefers to thepath from the top-level block (root node) to a bottom-level block (leaf node)in aB-Tree or B+ Tree index structure.
Example Usage in Indexing:
* AB-Tree indexorganizes data hierarchically, withbranches leading to different parts of the tree.
* When searching for a record, thequery follows a branchfrom theroot node down to the correct leaf node.
Why Other Options Are Incorrect:
* Option A (Fan-out) (Incorrect):Refers tohow many children a node has, not the path.
* Option B (Crow's foot) (Incorrect):Anotation used in ER diagrams, not indexing.
* Option D (Sparse index) (Incorrect):A type of indexstoring only some entries, not the path itself.
Thus, the correct answer isBranch, as it defines thepath from top to bottom in a database index.


NEW QUESTION # 55
......

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