Exam (elaborations)
WGU D426 V2 Exam 160 Questions with Verified Answers,100% CORRECT
- Course
- Institution
WGU D426 V2 Exam 160 Questions with Verified Answers
[Show more]
Content preview
WGU D426 V2 Exam 160 Questions with Verified AnswersThe relationship (within the relation) that describes how the value of one
attribute may be used to find the value of another attribute. - CORRECT ANSWER
Functional Dependency
An attribute that can be used to find the value of another attribute in the relation.
- CORRECT ANSWER Determinant
Value can be used to find the value of every other non-key attribute in the table.
Unique and minimal. - CORRECT ANSWER Candidate Key
Define & manage database structures - CORRECT ANSWER DDL
Adding, deleting, and modifying data - Manipulates data stored in a database. -
CORRECT ANSWER DML
Used to create user accounts, manage permissions and access. - CORRECT
ANSWER DCL
Includes CREATE, DROP, ALTER, TRUNCATE, RENAME - CORRECT ANSWER DDL
A view created and stored on the database. Underlying data is changed and also
updated in this view. Uses memory space. - CORRECT ANSWER Materialized View
Not stored in memory. Only computed when used or accessed. - CORRECT
ANSWER Virtual View
The data about the data. Describes elements such as columns, names, and data
type. - CORRECT ANSWER Metadata
Ordered collection of elements in parentheses. - CORRECT ANSWER Tuple
% of table rows selected by a query - CORRECT ANSWER Hit Ration
, Reads blocks directly, without accessing an index. - CORRECT ANSWER Table Scan
Reads index blocks sequentially in order to locate the needed table blocks. -
CORRECT ANSWER Index Scan
Database repeatedly splits the index in two until it finds a match. - CORRECT
ANSWER Binary Search
Database object that maps one or more tables to a single file. - CORRECT ANSWER
Tablespace
Specifies tables, columns, and keys. Implements database requirements in a
specific database system. Also called a schema. - CORRECT ANSWER Logical
Design
Specifies indexes, table structures, and partitions. Specifies how tables are
organized on storage media. - CORRECT ANSWER Physical Design
Components of a computer system and the relationships between components. -
CORRECT ANSWER Architecture
Interact directly with database users and administrators and send queries to the
query processor. Includes Connectors & APIs, Workbench, and utility programs. -
CORRECT 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. - CORRECT ANSWER Query Processor
Link between tools and query processor - CORRECT ANSWER Connection
Creates connections and manages communication between tools and query
parser. - CORRECT ANSWER Connection Manager
Translates the query processor instructions into low-level file system commands
that modify or retrieve data. - CORRECT ANSWER Storage Engine
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller paulhans. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now