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WGU D426 V2 Actual Exam Questions and Answers 100% Solved
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WGU D426 V2 Actual Exam Questions and Answers 100% Solved The relationship (within the relation) that describes how the value of one attribute may be used to find the value of another attribute. Answer - Functional Dependency An attribute that can be used to find the value of another attrib...

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  • July 6, 2024
  • 24
  • 2023/2024
  • Exam (elaborations)
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WGU D426 V2 Actual Exam Questions and Answers 100%
Solved

The relationship (within the relation) that describes how the value of one attribute may be
used to find the value of another attribute.


Answer - Functional Dependency


An attribute that can be used to find the value of another attribute in the relation.


Answer - Determinant


Value can be used to find the value of every other non-key attribute in the table. Unique
and minimal.


Answer - Candidate Key


Define & manage database structures


Answer - DDL


Adding, deleting, and modifying data - Manipulates data stored in a database.


Answer - DML


Used to create user accounts, manage permissions and access.


Answer - DCL


Includes CREATE, DROP, ALTER, TRUNCATE, RENAME


Answer - DDL

, WGU D426 V2 Actual Exam Questions and Answers 100%
Solved

A view created and stored on the database. Underlying data is changed and also updated
in this view. Uses memory space.


Answer - Materialized View


Not stored in memory. Only computed when used or accessed.


Answer - Virtual View


The data about the data. Describes elements such as columns, names, and data type.


Answer - Metadata


Ordered collection of elements in parentheses.


Answer - Tuple


% of table rows selected by a query


Answer - Hit Ration


Reads blocks directly, without accessing an index.


Answer - Table Scan


Reads index blocks sequentially in order to locate the needed table blocks.


Answer - Index Scan


Database repeatedly splits the index in two until it finds a match.

, WGU D426 V2 Actual Exam Questions and Answers 100%
Solved


Answer - Binary Search


Database object that maps one or more tables to a single file.


Answer - Tablespace


Specifies tables, columns, and keys. Implements database requirements in a specific
database system. Also called a schema.


Answer - Logical Design


Specifies indexes, table structures, and partitions. Specifies how tables are organized on
storage media.


Answer - Physical Design


Components of a computer system and the relationships between components.


Answer - Architecture


Interact directly with database users and administrators and send queries to the query
processor. Includes Connectors & APIs, Workbench, and utility programs.


Answer - Tools


Interprets queries. Compiles queries into low-level instructions for the storage engine.
Creates a plan to modify the database or retrieve data, and returns query results to the
application.


Answer - Query Processor

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