Commands and Queries
Master the Commands and Queries Quiz
Test your understanding of the essential concepts behind commands and queries. This quiz is designed to help you deepen your knowledge of CQRS and related design principles.
- 12 thought-provoking questions
- Multiple choice answers
- Immediate feedback on your responses
What is a command?
Something a drill instructor yells
Modifies state
Should not return a value
Filters a dataset with parameters
What is a query?
An interrogation by my spouse
Modifies state
Should return a value
Answers a question
What is not an exception to the CQRS design?
Popping an item from an array
New record creation in a db
Popping a donut into my coffee
What does CQRS stand for?
Continuous Query Response System
Command Query Responsibility Separation
Chips, Queso, Ranch, Salsa
The pledge of allegiation
Which stack should not return a value?
Command
Query
Which stack could return a dataset?
Command
Query
Baconator
Which is not a variation of CQRS?
Two database
Event Sourcing
Single Database
Mode-View-Controller
What is relied upon in a two database variation?
Unit tests
Data centers with backup generators
Caffeine
Eventual consistency pattern
What is the most complex variation of CQRS?
The martin fowler margarita
Two database
Model-view view-model
Event sourcing
Single database
What is a benefit of the Event Sourcing?
Point-in-time playback
Complete audit trail
Two variations of stacks (command, query)
Fast read-only database
Production database can be rebuilt
What is not a benefit to Event Sourcing
Inconsistent across stacks
Increased complexity
Event sourcing costs
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