[Solved] Which of the following is the correct sequence in the Outbox pattern? — Ans: Write event to outbox table, commit transaction, then publish event | Microservices

Microservices - Advanced Patterns

Which of the following is the correct sequence in the Outbox pattern?

AWrite event to outbox table, commit transaction, then publish event

BPublish event, then write event to outbox table, then commit transaction

CCommit transaction, then write event to outbox table, then publish event

DPublish event and write to outbox table simultaneously outside transaction

Step-by-Step Solution

Solution:

Step 1: Understand transaction order in Outbox pattern
The event is first written to the outbox table inside the same transaction as the data change.
Step 2: Commit transaction before publishing
Only after the transaction commits successfully, a separate process reads and publishes the event.
Final Answer:
Write event to outbox table, commit transaction, then publish event -> Option A
Quick Check:
Outbox write before commit, publish after commit [OK]

Quick Trick: Events must be saved before commit, published after [OK]

Common Mistakes:

Master "Advanced Patterns" in Microservices

9 interactive learning modes - each teaches the same concept differently

More Microservices Quizzes

Which of the following is the correct sequence in the Outbox pattern?