What is the main task solved by using the CQRS pattern in system architecture?

The CQRS (Command Query Responsibility Segregation) pattern separates operations that change state (commands) from data reading operations (queries) into different models and interfaces.

The main goal of CQRS is to improve system scalability and performance, as well as to simplify the maintenance of complex business logic by dividing responsibilities:

• Commands modify the system state and may contain complex validation logic.
• Queries return data and are optimized for reading, often without complex logic.

This allows:

• Using different data models for reading and writing.
• Scaling read and write operations independently.
• Improving code readability and maintainability through separation of concerns.

Example: in C#, you can have separate classes and services for handling commands (e.g., creating an order) and for queries (retrieving a list of orders), which simplifies architecture and increases flexibility.