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WGU Data Management โ Foundations Exam Sample Questions (Q46-Q51):
NEW QUESTION # 46
What is the role of the database administrator?
Answer: A
Explanation:
ADatabase Administrator (DBA)is responsible for the management, security, and performance of a database system. This includes controlling access to data, ensuring database integrity, optimizing performance, managing backups, and protecting the system from unauthorized access.
* Option A (Incorrect):A DBA is not just a consumer of data but is primarily responsible for the database's management.
* Option B (Correct):Security is one of the key responsibilities of a DBA, including enforcing user access controls and implementing encryption and authentication mechanisms.
* Option C (Incorrect):While DBAs work with data structures, it is typically the role of adata architect ordatabase designerto define data formats and schema structures.
* Option D (Incorrect):Developing application programs that interact with the database is typically the role ofsoftware developersordatabase programmers, not DBAs.
NEW QUESTION # 47
Which term refers to a path from a top-level block to a bottom-level block?
Answer: B
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 # 48
Which clause from a SELECT statement immediately accompanies the SELECT clause in MySQL?
Answer: D
Explanation:
InSQL syntax, the FROM clause is the first clause that follows SELECT. It specifies the table(s) from which the data will be retrieved.
Example:
sql
SELECT name, salary FROM Employees;
* Option A (Correct):The FROM clauseimmediately followsthe SELECT clause in MySQL.
* Option B (Incorrect):VALUE is not a valid clause in MySQL SELECT statements.
* Option C (Incorrect):WHERE is used to filter recordsafter specifying the table in FROM.
* Option D (Incorrect):TABLE is not a valid clause following SELECT in SQL.
NEW QUESTION # 49
Which operator defines the field that the index is using in a CREATE TABLE statement?
Answer: C
Explanation:
TheONkeyword specifies the field used by anindexwhen creating it in SQL.
Example Usage:
sql
CREATE INDEX idx_employee_name
ON Employees(Name);
* Here, an indexidx_employee_nameis createdon the Name column.
* Thisimproves query performancewhen filtering by Name.
Why Other Options Are Incorrect:
* Option B (IN) (Incorrect):Used in queries to match values in a set, not for indexing.
* Option C (UNIQUE) (Incorrect):Ensures a column has unique values but doesnot define an index field.
* Option D (CHECK) (Incorrect):Used forvalidating column values, not for indexing.
Thus, the correct answer isON, as it defines thecolumn on which an index is created.
NEW QUESTION # 50
Which characteristic is true for non-relational databases?
Answer: D
Explanation:
Non-relational databases(also calledNoSQL databases) are designed for handlingbig dataandunstructured dataefficiently. They are optimized forhorizontal scaling, making them ideal forlarge-scale distributed systems.
* Option A (Correct):Non-relational databases areoptimized for big data, handling massive volumes of data across distributed architectures.
* Option B (Incorrect):NoSQL databases donotuse SQL as their primary query language. They often use JSON-based queries (e.g., MongoDB).
* Option C (Incorrect):Transaction-heavy applications requireACID compliance, which relational databases (SQL) handle better than NoSQL databases.
* Option D (Incorrect):NoSQL databases usedocument, key-value, graph, or column-family storage models, nottables, columns, and rowslike relational databases.
NEW QUESTION # 51
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