WGU D426 V2 EXAM 2025 QUESTIONS WITH
VERIFIED ANSWERS A+ GRADE The relationship (within the relation) that describes howthe value of one attribute may be
used to find the value ofanother attribute.: Functional Dependency
An attribute that can be used to find the value of anotherattribute in th...
The relationship (within the relation) that describes howthe value of one attribute may be
used to find the value ofanother attribute.: Functional Dependency
An attribute that can be used to find the value of anotherattribute in the relation.:
Determinant
Value can be used to find the value of every other non-keyattribute in the table. Unique and
minimal.: Candidate Key
Define & manage database structures: DDL
Adding, deleting, and modifying data - Manipulates datastored in a data- base.: DML
Used to create user accounts, manage permissions andaccess.: DCL
Includes CREATE, DROP, ALTER, TRUNCATE, RENAME:
DDL
A view created and stored on the database. Underlying datais changed and also updated
in this view. Uses memory space.: Materialized View
Not stored in memory. Only computed when used oraccessed.: Virtual View
The data about the data. Describes elements such ascolumns, names, and data type.:
Metadata
,Ordered collection of elements in parentheses.: Tuple
% of table rows selected by a query: Hit Ration
Reads blocks directly, without accessing an index.: TableScan
Reads index blocks sequentially in order to locate theneeded table blocks.: Index Scan
Database repeatedly splits the index in two until it finds amatch.: Binary Search
Database object that maps one or more tables to a singlefile.: Tablespace
Specifies tables, columns, and keys. Implements databaserequirements in a specific
database system. Also called a schema.: Logical Design
Specifies indexes, table structures, and partitions.Specifies how tables are organized on
storage media.:Physical Design
Components of a computer system and the relationshipsbetween compo- nents.: Architecture
Interact directly with database users and administratorsand send queries to the query
processor. Includes Connectors & APIs, Workbench, and utility programs.: 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.: Query Processor
Link between tools and query processor: Connection
, Creates connections and manages communicationbetween tools and query parser.:
Connection Manager
Translates the query processor instructions into low-levelfile system commands that modify
or retrieve data.: Storage Engine
Accesses data on storage media. Data stored on storagemedia and orga- nized in files.
Contains 3 types of data: - User data (tables & indexes) - Log files (record of any changes) -
Data dictionary (aka: catalog directory of tables, columns, keys, indexes in a relational
database). One row foreach database object.: File System
Stores reusable information in main memory.: CacheManager
Retains data blocks from the file system for possiblereuse.: Buffer Manager
Arranged in hierarchy: Multi-tier architecture
Multi-tier consisting of web browsers and web serverscommunicating over the internet.:
Web architecture
A software layer that emulates a complete, independentcomputing envi- ronment.: Virtual
Machine
A database offered as a PaaS cloud service.: CloudDatabase
A statement or proposition from which another statementis inferred.: -Premise
Multiple processors managed by a single operating system instance. Shared memory -
share the same memoryand storage media.
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