WGU D426 OA EXAM ACTUAL EXAM COMPLETE
150 QUESTIONS WITH DETAILED VERIFIED
ANSWERS (100% CORRECT ANSWERS) / ALREADY
GRADED A+
The relationship (within the relation) that describes how the value of one attribute may
be used to find the value of another attribute. - ANSWERFunctional Dependency
An attribute that can be used to find the value of another attribute in the relation. -
ANSWERDeterminant
Value can be used to find the value of every other non-key attribute in the table. Unique
and minimal. - ANSWERCandidate Key
Define & manage database structures - ANSWERDDL
Adding, deleting, and modifying data - Manipulates data stored in a database. -
ANSWERDML
Used to create user accounts, manage permissions and access. - ANSWERDCL
Includes CREATE, DROP, ALTER, TRUNCATE, RENAME - ANSWERDDL
A view created and stored on the database. Underlying data is changed and also
updated in this view. Uses memory space. - ANSWERMaterialized View
Not stored in memory. Only computed when used or accessed. - ANSWERVirtual View
The data about the data. Describes elements such as columns, names, and data type. -
ANSWERMetadata
Ordered collection of elements in parentheses. - ANSWERTuple
% of table rows selected by a query - ANSWERHit Ration
Reads blocks directly, without accessing an index. - ANSWERTable Scan
Reads index blocks sequentially in order to locate the needed table blocks. -
ANSWERIndex Scan
Database repeatedly splits the index in two until it finds a match. - ANSWERBinary
Search
, Database object that maps one or more tables to a single file. - ANSWERTablespace
Specifies tables, columns, and keys. Implements database requirements in a specific
database system. Also called a schema. - ANSWERLogical Design
Specifies indexes, table structures, and partitions. Specifies how tables are organized
on storage media. - ANSWERPhysical Design
Components of a computer system and the relationships between components. -
ANSWERArchitecture
Interact directly with database users and administrators and send queries to the query
processor. Includes Connectors & APIs, Workbench, and utility programs. -
ANSWERTools
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. - ANSWERQuery Processor
Link between tools and query processor - ANSWERConnection
Creates connections and manages communication between tools and query parser. -
ANSWERConnection Manager
Translates the query processor instructions into low-level file system commands that
modify or retrieve data. - ANSWERStorage Engine
Accesses data on storage media. Data stored on storage media and organized 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 for each database object. - ANSWERFile System
Stores reusable information in main memory. - ANSWERCache Manager
Retains data blocks from the file system for possible reuse. - ANSWERBuffer Manager
Arranged in hierarchy - ANSWERMulti-tier architecture
Multi-tier consisting of web browsers and web servers communicating over the internet.
- ANSWERWeb architecture
A software layer that emulates a complete, independent computing environment. -
ANSWERVirtual Machine
A database offered as a PaaS cloud service. - ANSWERCloud Database
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