Idempotency

SQS Lambda Integration - The Idempotency vs. Architecture Trade-off | SAA-C03

28 January 2026·1186 words·6 mins

Architecture Drills AWS SAA-C03 FinOps Decision Matrix SQS Lambda Event-Driven Architecture Idempotency

A photo processing startup faces duplicate email notifications due to SQS standard queue behavior triggering Lambda multiple times. This drill explores visibility timeout tuning, queue type selection, and deletion timing strategies to achieve exactly-once processing with minimal operational overhead.

SQS Dedup vs Visibility Timeout | SAA-C03

7 January 2026·1026 words·5 mins

Architecture Drills AWS SAA-C03 FinOps Decision Matrix Amazon SQS Message Processing Idempotency Distributed Systems

A retail analytics company faces duplicate database records despite unique SQS messages. This drill examines why visibility timeout extension is the correct solution and how it prevents race conditions in distributed message processing.

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