Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 456 discussion

Comparison of B and D: B (On-Demand Mode) is better when: Traffic patterns are highly variable or unpredictable. Automatic scaling is preferred to minimize manual intervention. The workload is intermittent, making On-Demand pricing more cost-efficient. D (Manually Adjusting Shard Count) is better when: The application has predictable traffic peaks and troughs. The goal is to manually control scaling and costs in provisioned mode. Immediate scaling is required to meet throughput needs, as On-Demand Mode may introduce a slight delay for shard scaling. Conclusion: The correct solution depends on the specific requirements mentioned in the question. If the question highlights unpredictable traffic, On-Demand Mode (B) is likely the better choice. However, if the traffic peaks are predictable and manual control is desired, increasing shards (D) is the optimal solution.

On-demand - data streams with an on-demand mode require no capacity planning and automatically scale to handle gigabytes of write and read throughput per minute. With the on-demand mode, Kinesis Data Streams automatically manages the shards in order to provide the necessary throughput.

aws kinesis update-shard-count \ --stream-name my-data-stream \ --target-shard-count 4 \ --scaling-type UNIFORM_SCALING