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Vladimir Khorikov

There are a lot of misconceptions around the CQRS pattern. This course is an in-depth guideline into every concern or implementation question you've ever had about CQRS.

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There are a lot of misconceptions around the CQRS pattern. This course is an in-depth guideline into every concern or implementation question you've ever had about CQRS.

There are a lot of misconceptions around the CQRS pattern, especially when it comes to applying it in real-world software projects. In this course, CQRS in Practice, you will learn all about CQRS with event sourcing, database configuration for reads and writes, and more. First, you will learn exactly what CQRS is, the principles behind it, and the benefits it can provide for your project. Next, you will explore the common misconceptions and anti-patterns around CQRS. Finally, you will see a detailed, step-by-step implementation of this pattern in practice. The sample project you'll be working on is close to what you will find in the real world, and you will see each step on the way to CQRS in great detail. By the end of this course, you will have a foundational understanding of the CQRS pattern and how to implement it in your software projects.

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What's inside

Syllabus

Course Overview
Introduction
Introducing a Sample Project
Refactoring Towards a Task-based Interface
Read more
Segregating Commands and Queries
Implementing Decorators upon Command and Query Handlers
Simplifying the Read Model
Introducing a Separate Database for Queries
Synchronizing the Commands and Queries Databases
CQRS Best Practices and Misconceptions

Good to know

Know what's good
, what to watch for
, and possible dealbreakers
Examines CQRS with event sourcing, which is standard in industry
Concentrates on the misconceptions and anti-patterns around CQRS, a key design concern
Develops foundational knowledge of CQRS, a critical design pattern
Taught by Vladimir Khorikov, recognized for their work in CQRS
Exploresp best practices for CQRS
Requires familiarity with CQRS, a potential barrier for some learners

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in CQRS in Practice with these activities:
Organize your course notes and resources
Consolidate your learning materials, making them easily accessible for future reference and reinforcement of key concepts covered in the course.
Show steps
  • Gather all your notes, assignments, quizzes, and other materials from the course.
  • Organize them into a logical structure, such as by topic or module.
  • Review your materials regularly to refresh your memory and reinforce your understanding.
Review CQRS concepts
Review the fundamental concepts of CQRS to prepare for this course
Browse courses on CQRS
Show steps
  • Read the course overview
  • Read an article introducing CQRS
  • Watch a video on CQRS
Review SQL concepts
Review the basics of SQL to strengthen your understanding of database querying and manipulation, which is essential for CQRS implementation.
Browse courses on SQL
Show steps
  • Go through your notes or a SQL tutorial to recall the fundamentals of SQL syntax and commands.
  • Practice writing basic SQL queries to select, insert, update, and delete data.
  • Review concepts like joins, subqueries, and indexing to enhance your understanding of data retrieval and optimization.
Nine other activities
Expand to see all activities and additional details
Show all 12 activities
Read 'Implementing Domain-Driven Design'
Gain a deeper understanding of CQRS within the context of Domain-Driven Design, enhancing your comprehension of the pattern's role in complex software architectures.
Show steps
  • Read Chapter 12, which covers CQRS in detail, explaining its benefits and how to apply it effectively.
  • Review the case studies and examples provided in the book to reinforce your understanding.
  • Reflect on how the concepts discussed in the book relate to your own project or work.
Practice Command and Query Handling
Reinforce your understanding of command and query handling techniques through repetitive exercises.
Show steps
  • Create a sample application with a simple command and query handling setup.
  • Execute various commands and queries on the sample application and observe the results.
  • Experiment with different command and query handlers and compare their performance.
Follow a tutorial on CQRS with event sourcing
Reinforce your understanding of CQRS with event sourcing by following a guided tutorial
Browse courses on CQRS
Show steps
  • Find a tutorial on CQRS with event sourcing
  • Follow the steps in the tutorial
  • Complete the exercises in the tutorial
Follow tutorials on CQRS using Spring Boot
Explore practical examples of CQRS implementation using Spring Boot, gaining hands-on experience and reinforcing your understanding.
Show steps
  • Find online tutorials or courses that provide step-by-step guidance on building CQRS applications with Spring Boot.
  • Follow the tutorials, implementing the concepts and techniques discussed in the course.
  • Experiment with different scenarios and configurations to deepen your understanding of CQRS in practice.
Attend a CQRS meetup or conference
Connect with other professionals and experts in the field, exchanging knowledge, learning about industry trends, and expanding your network.
Show steps
  • Research upcoming CQRS meetups or conferences in your area or online.
  • Register for the event and actively participate in sessions and discussions.
  • Engage with speakers and attendees, asking questions and sharing your own experiences.
Develop a CQRS prototype
Build a small-scale CQRS application to apply your knowledge, gain practical experience, and showcase your understanding of the pattern.
Show steps
  • Design a simple domain model and define the commands and queries.
  • Implement the command and query handlers, ensuring proper separation of concerns.
  • Create a separate database for read operations to optimize performance.
  • Test the application thoroughly to validate its functionality and adherence to CQRS principles.
Solve coding exercises on CQRS
Test your understanding of CQRS by solving coding exercises
Browse courses on CQRS
Show steps
  • Find a website or platform with CQRS coding exercises
  • Solve the exercises
  • Review your solutions and identify areas for improvement
Contribute to an open-source CQRS project
Immerse yourself in a real-world CQRS implementation by contributing to a project, gaining practical experience and exposure to industry-standard practices.
Show steps
  • Identify open-source CQRS projects that align with your interests and skill level.
  • Review the project's documentation and codebase to understand its architecture and implementation.
  • Find a suitable issue or feature to contribute to, discussing your ideas with the project maintainers.
  • Implement your changes, following the project's coding guidelines and best practices.
  • Submit a pull request and actively engage in code reviews to improve your solution.
Implement CQRS in a small project
Apply your CQRS knowledge by implementing it in a small project
Browse courses on CQRS
Show steps
  • Design a simple project that can benefit from CQRS
  • Implement the project using CQRS principles
  • Test your implementation

Career center

Learners who complete CQRS in Practice will develop knowledge and skills that may be useful to these careers:
Software Architect
Software Architects are responsible for the design, implementation, and maintenance of software systems. They work with stakeholders to understand their needs and translate them into technical specifications. Software Architects may also lead teams of software engineers and oversee the development process. The CQRS in Practice course can help Software Architects build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of software systems. This course can also help Software Architects learn how to use CQRS to implement complex business requirements.
Software Engineer
Software Engineers apply engineering principles to the design, development, and maintenance of software systems. They work with Software Architects to translate technical specifications into working code. Software Engineers may also work on their own to develop new features or fix bugs. The CQRS in Practice course can help Software Engineers build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of software systems. This course can also help Software Engineers learn how to use CQRS to implement complex business requirements.
Data Architect
Data Architects are responsible for the design and implementation of data architectures. They work with stakeholders to understand their needs and translate them into technical specifications. Data Architects may also lead teams of data engineers and oversee the development process. The CQRS in Practice course can help Data Architects build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of data architectures. This course can also help Data Architects learn how to use CQRS to implement complex business requirements.
Enterprise Architect
Enterprise Architects are responsible for the design and implementation of enterprise architectures. They work with stakeholders to understand their needs and translate them into technical specifications. Enterprise Architects may also lead teams of enterprise architects and oversee the development process. The CQRS in Practice course can help Enterprise Architects build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of enterprise architectures. This course can also help Enterprise Architects learn how to use CQRS to implement complex business requirements.
Business Analyst
Business Analysts are responsible for the analysis and documentation of business requirements. They work with stakeholders to understand their needs and translate them into technical specifications. Business Analysts may also work on their own to develop new business processes or improve existing ones. The CQRS in Practice course can help Business Analysts build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of business systems. This course can also help Business Analysts learn how to use CQRS to implement complex business requirements.
Database Administrator
Database Administrators are responsible for the management and maintenance of database systems. They work with stakeholders to understand their needs and design and implement database solutions. Database Administrators may also be responsible for performance tuning and security. The CQRS in Practice course can help Database Administrators build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of database systems. This course can also help Database Administrators learn how to use CQRS to implement complex business requirements.
Systems Analyst
Systems Analysts are responsible for the analysis, design, and implementation of computer systems. They work with stakeholders to understand their needs and translate them into technical specifications. Systems Analysts may also lead teams of systems engineers and oversee the development process. The CQRS in Practice course can help Systems Analysts build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of computer systems. This course can also help Systems Analysts learn how to use CQRS to implement complex business requirements.
Project Manager
Project Managers are responsible for the planning, execution, and control of projects. They work with stakeholders to define project scope, timelines, and budgets. Project Managers may also lead teams of project team members and oversee the project development process. The CQRS in Practice course can help Project Managers build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of project management systems. This course can also help Project Managers learn how to use CQRS to implement complex project management requirements.
Technical Writer
Technical Writers are responsible for the creation and maintenance of technical documentation. They work with subject matter experts to gather information and develop clear and concise documentation. Technical Writers may also work on their own to develop new documentation or update existing documentation. The CQRS in Practice course can help Technical Writers build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of technical documentation systems. This course can also help Technical Writers learn how to use CQRS to implement complex technical documentation requirements.
Software Tester
Software Testers are responsible for testing software systems to ensure that they meet requirements. They work with Software Engineers and other stakeholders to develop test plans and execute tests. Software Testers may also work on their own to develop new test cases or improve existing test cases. The CQRS in Practice course can help Software Testers build a foundation in CQRS, which is a design pattern that can help improve the scalability and performance of software testing systems. This course can also help Software Testers learn how to use CQRS to implement complex software testing requirements.
Systems Engineer
Systems Engineers are responsible for the design, development, and implementation of computer systems. They work with stakeholders to understand their needs and translate them into technical specifications. Systems Engineers may also lead teams of systems engineers and oversee the development process. The CQRS in Practice course may be useful for Systems Engineers who are interested in learning how to use CQRS to implement complex systems engineering requirements.
Machine Learning Engineer
Machine Learning Engineers are responsible for the design, development, and implementation of machine learning systems. They work with stakeholders to understand their needs and develop machine learning solutions. Machine Learning Engineers may also work on their own to develop new machine learning algorithms or improve existing ones. The CQRS in Practice course may be useful for Machine Learning Engineers who are interested in learning how to use CQRS to implement complex machine learning requirements.
Data Analyst
Data Analysts are responsible for the collection, analysis, and interpretation of data. They work with stakeholders to understand their needs and develop data-driven solutions. Data Analysts may also work on their own to develop new data analysis techniques or improve existing ones. The CQRS in Practice course may be useful for Data Analysts who are interested in learning how to use CQRS to implement complex data analysis requirements.
Business Intelligence Analyst
Business Intelligence Analysts are responsible for the analysis and interpretation of business data. They work with stakeholders to understand their needs and develop business intelligence solutions. Business Intelligence Analysts may also work on their own to develop new business intelligence reports or improve existing ones. The CQRS in Practice course may be useful for Business Intelligence Analysts who are interested in learning how to use CQRS to implement complex business intelligence requirements.
Data Scientist
Data Scientists are responsible for the collection, analysis, and interpretation of data. They work with stakeholders to understand their needs and develop data-driven solutions. Data Scientists may also work on their own to develop new data analysis techniques or improve existing ones. The CQRS in Practice course may be useful for Data Scientists who are interested in learning how to use CQRS to implement complex data analysis requirements.

Reading list

We've selected 16 books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in CQRS in Practice.
Provides an in-depth overview of CQRS and event sourcing, including real-world examples and best practices. It's a valuable resource for understanding the concepts and practical applications of CQRS.
Provides a good overview of CQRS and will help you understand the concepts and benefits of using CQRS in your projects.
Explores the principles and practices of event-driven architecture and event sourcing in depth. It covers various aspects of event sourcing, including event modeling, data management, and scaling.
Provides a comprehensive overview of the challenges and techniques involved in designing and building scalable systems. It covers various topics, including performance optimization, distributed systems, and cloud computing.
Comprehensive guide to MongoDB, a popular NoSQL database. It covers all aspects of MongoDB, from installation and configuration to data modeling, querying, and performance optimization.
This example-driven guide to CQRS is written for developers who want to learn CQRS by building a real-world application. It takes readers through the steps of building a CQRS system from scratch.
Provides a comprehensive introduction to Domain-Driven Design (DDD), which key concept in CQRS. It covers topics such as domain modeling, bounded contexts, and aggregate design.
Provides a deep dive into the challenges and techniques involved in designing and building data-intensive applications. It covers various topics, including data modeling, data storage, data processing, and data analytics.
Provides a comprehensive overview of cloud computing concepts, technologies, and best practices. It covers various aspects of cloud computing, including cloud architecture, cloud services, and cloud security.
This classic book is considered the definitive guide to DDD. It provides a deep dive into the principles and practices of DDD, including discussions on CQRS and event sourcing.
Provides a practical guide to building microservices. It will help you understand the benefits and challenges of using microservices and how to design and implement them effectively.
Classic in the field of enterprise integration. It provides a comprehensive catalog of design patterns for integrating applications and systems.
Provides a comprehensive guide to designing and implementing data-intensive applications. It will help you understand the challenges of working with large datasets and how to use CQRS to address these challenges.
Provides a concise overview of CQRS. It's a good starting point for those who want to learn the basics of CQRS.
Provides a comprehensive guide to software architecture using C#. It will help you understand the principles of software architecture and how to apply them to your CQRS implementation.
Provides a comprehensive guide to microservices patterns. It will help you understand the benefits and challenges of using microservices and how to design and implement them effectively.

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