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WGU D426 V2 EXAM LATEST COMPLETE REAL EXAM ACTUAL QUESTIONS AND WELL ELABORATED ANSWERS (100% CORRECT VERIFIED ANSWERS) LATEST UPDATED VERSION |GUARANTEED PASS A+ (BRAND NEW!!)$20.49
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WGU D426 V2 EXAM LATEST 2024-2025 COMPLETE
REAL EXAM ACTUAL QUESTIONS AND WELL
ELABORATED ANSWERS (100% CORRECT VERIFIED
ANSWERS) LATEST UPDATED VERSION
|GUARANTEED PASS A+ (BRAND NEW!!)
Multi-tier consisting of web browsers and web servers communicating over the internet.
Answer- Web architecture
A software layer that emulates a complete, independent computing environment.
Answer- Virtual Machine
A database offered as a PaaS cloud service.
Answer- Cloud Database
A statement or proposition from which another statement is inferred.
Answer- Premise
Multiple processors managed by a single operating system instance.
Answer- Shared memory - share the same memory and storage media.
Shared storage - share storage media only.
Shared nothing
Parallel Computer
,Group of computers connected by LAN or WAN
Answer- Node
Group of nodes connected by a LAN, managed by separate operating system instances. Similar to a
parallel computer.
Answer- Cluster
Runs on a parallel computer or cluster
Answer- Parallel Database
Runs on multiple computers connected by a WAN
Answer- Distributed Database
Updates data on multiple nodes of a distributed database. Two-phase commit (nodes receive notice of
update, store update in log, send confirmation, then receive commit). Either all nodes or no nodes must
be successfully updated.
Answer- Distributed Transactions
Updates data on a single node of a distributed database. Databases that use this are called "eventually
consistent".
Answer- Local Transaction
, States that a distributed database cannot be Consistent, Available, and Petition-tolerant simutaneously.
Availability refers to individual nodes. Consistent database - confirms to all rules at all times. Network
partition - forms when a network error prevents nodes from communicating. Petition-tolerant -
database that continues to function when a network partition occurs.
Answer- CAP Theorem
Maintains two or more replicas on separate storage devices. Advantages: High availability, fast
concurrent reads, local reads. Disadvantages: Slow or inconsistent updates.
Answer- Replicated database
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
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