Exam AWS Certified Developer Associate topic 1 question 349 discussion

D, "at least Once" for Asynchronous and "at most once" for Synchronous. Check the Table values for Execution Guarantee https://docs.aws.amazon.com/step-functions/latest/dg/express-at-least-once-execution.html

Ans: D https://docs.aws.amazon.com/step-functions/latest/dg/concepts-standard-vs-express.html Express Workflows are ideal for high-volume, event-processing workloads such as IoT data ingestion, streaming data processing and transformation. https://docs.aws.amazon.com/step-functions/latest/dg/concepts-express-synchronous.html Results are written to DynamoDB. You can use Asynchronous Express Workflows when you don't require immediate response output, such as messaging services or data processing that other services don't depend on. https://aws.amazon.com/step-functions/pricing/

C The orchestrator must not miss a transaction - Synchronous

D Option D, using Asynchronous Express Workflows, is designed for high-throughput and high-concurrency scenarios, making it the best fit for this use case. It is designed to provide at-least-once processing with retries and has a lower cost compared to Standard Workflows.

The orchestrator must process each transaction at least once. Therefore it needs to be an Express workflow. And since the orchestrator must not miss any transactions we need to ensure that the process is completed. Or in other words, we need to get a success or failure response. Therefore, we need to use Synchronous Express Workflow.

D it is.

D, "at least Once" for Asynchronous and "at most once" for Synchronous. Check the Table values for Execution Guarantee https://docs.aws.amazon.com/step-functions/latest/dg/express-at-least-once-execution.html

D https://docs.aws.amazon.com/step-functions/latest/dg/express-at-least-once-execution.html Asynchronous Express Workflows --> At-least-once workflow execution

Asynchronous Express Workflows: At-least-once workflow execution. Synchronous Express Workflows: At-most-once workflow execution.

D is correct as atleast once

D is definitely the right answer for me. Asynchronous Express Workflows is the same as configuring SQS dead letter queue that will ensure that each transaction must be processed at least once.

I Vote D https://docs.aws.amazon.com/step-functions/latest/dg/concepts-standard-vs-express.html Asynchronous Express Workflows: At-least-once workflow execution. Synchronous Express Workflows: At-most-once workflow execution.

Going with Synchronous Express Workflows

I think C as well

I think it's C https://docs.aws.amazon.com/step-functions/latest/dg/concepts-express-synchronous.html