CQRS, or Command Query Responsibility Segregation, is a powerful architectural pattern that separates your application's write operations (commands) from read operations (queries), enabling each to be optimized independently. For example, in a banking system, the command side handles account updates and transactions, while the query side retrieves transaction history or account balances. This pattern improves scalability, especially when reads significantly outnumber writes or when different parts of your system require eventual consistency.
For a deeper dive into CQRS and its real-world applications, watch my full video where I break down its use in banking systems and event-sourcing patterns.
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