Question 31
Domain 3: Design High-Performing ArchitecturesAn application needs time-series data storage for IoT sensor data with automatic data retention policies. Which database is MOST appropriate?
Correct answer: C
Explanation
Amazon Timestream is purpose-built for “time-series data” such as IoT sensor readings and supports automatic data retention policies. The source emphasizes choosing “purpose-built AWS services for workloads” and using “time series format” databases when the workload is time-series data.
Why each option is right or wrong
A. Amazon DynamoDB
B. Amazon RDS
C. Amazon Timestream
Amazon Timestream is the AWS database service explicitly designed for time-series workloads, which matches IoT sensor readings that arrive as timestamped measurements. The exam also points to selecting a database with the right data format and retention behavior; Timestream supports automatic data retention policies, including separate memory and magnetic stores with configurable retention periods, so it fits the requirement better than a general-purpose relational or key-value database.
D. Amazon Redshift