Distributed Transactions & Data Management

Explain the database-per-service pattern and its data consistency challenges.

Compare choreography vs. orchestration patterns for coordinating microservices, including their trade-offs.

Design a saga flow for a distributed transaction, outlining events and compensation logic.

Implement a choreographed saga using events for the 'happy path' and compensating transactions.

Implement an orchestrated saga using a central service to manage command and compensation flows.

Explain the CQRS pattern and its use cases for optimizing read/write workloads.

Implement the command side of a CQRS system to handle state changes and the query side to expose denormalized read models.

Analyze the trade-offs of eventual consistency and describe strategies to mitigate user-experience issues.