WGU D426 426 Exam Questions And
Correct Answers
The relationship (within the relation) that describes how the value of one attribute may be used to
find the value of another attribute.
Functional Dependency
3 multiple choice options
An attribute that can be used to find the value of another a...
The relationship (within the relation) that describes how the value of one attribute may be used to
find the value of another attribute.
Functional Dependency
3 multiple choice options
An attribute that can be used to find the value of another attribute in the relation.
Determinant
Value can be used to find the value of every other non-key attribute in the table. Unique and
minimal.
Candidate Key
3 multiple choice options
Define & manage database structures
DDL
2 multiple choice options
Adding, deleting, and modifying data - Manipulates data stored in a database.
DML
2 multiple choice options
Used to create user accounts, manage permissions and access.
DCL
2 multiple choice options
Includes CREATE, DROP, ALTER, TRUNCATE, RENAME
DDL
2 multiple choice options
A view created and stored on the database. Underlying data is changed and also updated in this
view. Uses memory space.
Materialized View
2 multiple choice options
Not stored in memory. Only computed when used or accessed.
Virtual View
2 multiple choice options
The data about the data. Describes elements such as columns, names, and data type.
Metadata
3 multiple choice options
Ordered collection of elements in parentheses.
Tuple
3 multiple choice options
% of table rows selected by a query
Hit Ration
3 multiple choice options
Reads blocks directly, without accessing an index.
Table Scan
3 multiple choice options
Reads index blocks sequentially in order to locate the needed table blocks.
Index Scan
2 multiple choice options
Database repeatedly splits the index in two until it finds a match.
Binary Search
3 multiple choice options
Database object that maps one or more tables to a single file.
Tablespace
3 multiple choice options
Specifies tables, columns, and keys. Implements database requirements in a specific database
system. Also called a schema.
Logical Design
3 multiple choice options
Specifies indexes, table structures, and partitions. Specifies how tables are organized on storage
media.
Physical Design
3 multiple choice options
Components of a computer system and the relationships between components.
Architecture
3 multiple choice options
Interact directly with database users and administrators and send queries to the query processor.
Includes Connectors & APIs, Workbench, and utility programs.
Tools
3 multiple choice options
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
3 multiple choice options
Link between tools and query processor
Connection
3 multiple choice options
Creates connections and manages communication between tools and query parser.
Connection Manager
3 multiple choice options
Translates the query processor instructions into low-level file system commands that modify or
retrieve data.
Storage Engine
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