Exams / DVA-C02 / Concurrency and performance tuning

Concurrency and performance tuning: DVA-C02 practice questions

3 free questions on Concurrency and performance tuning, from the Troubleshooting and Optimization domain (18% of the DVA-C02 exam guide). Every question is original and explains why each option is right or wrong.

Questions

1. A Lambda function behind Amazon API Gateway loads a large framework during initialisation. Every weekday at 09:00 traffic jumps sharply, and users see slow responses for the…Medium
2. A Lambda function that resizes images is configured with 256 MB of memory. CloudWatch shows that it uses only about 150 MB, but its duration is long because the work is…Easier
3. A Lambda function creates a new database connection and a new AWS SDK client inside its handler on every invocation. Profiling shows that most of the time on warm invocations is…Medium

Study Concurrency and performance tuning

• Lambda function scaling and concurrency

More Troubleshooting and Optimization topics

• Logging and CloudWatch Logs Insights (2)
• Custom metrics and alarms (2)
• Tracing with X-Ray (2)
• Root cause analysis (1)
• Caching and message filtering (1)