Troubleshooting and optimization
Practise only this domain. 35 questions with explanations, 20 at a time.
Start this domainSample questions
- A DynamoDB read path has become slow only during busy afternoons. Which CloudWatch metric should be checked first to see whether requests are being rejected for lack of read throughput?Medium
- Users report that some requests to a Lambda-backed feature fail with no code exception, and the function's own error count is flat. Which CloudWatch metric shows whether invocations are being rejected because of concurrency limits?Easy
- A payments function normally finishes in about 200 ms, but a few requests take far longer. Which CloudWatch statistic reveals the slowest execution in each period?Easy
- A Java function on Lambda shows multi-second cold starts after each deployment. Which change most directly reduces the initialization time?Medium