Development with AWS Services IV
Explore solutions to AWS Certified Developer Associate exam questions focusing on development, security, deployment, and troubleshooting with core services like DynamoDB, Lambda, RDS, and Step Functions. Learn how to handle capacity errors, implement atomic transactions, manage database connections, ensure exactly-once processing, access private resources in VPC, and design fault-tolerant serverless workflows effectively.
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Question 16
An application utilizes an Amazon DynamoDB table with Provisioned capacity mode and frequently experiences ProvisionedThroughputExceededException errors during short, unpredictable bursts of write traffic. CloudWatch metrics indicate that the consumed write capacity units are often below the provisioned limits, yet throttling still occurs.
Which inherent DynamoDB performance enhancement is designed to mitigate such sudden, short-term surges in traffic?
A. Burst capacity
B. Adaptive capacity
C. Warm throughput
D. On-demand capacity mode
Question 17
A developer is designing a new financial transaction system that needs to ensure that funds are transferred from one account to another atomically. This means that either both the debit from the source account and the credit to the destination account succeed, or neither operation occurs. The accounts are stored in an Amazon DynamoDB table.
Which DynamoDB API operation should the developer use to ensure these transactions are atomic? ...