What You'll Be Tested On
- Tracing and debugging with X-Ray segments, annotations, and service maps
- Monitoring with CloudWatch metrics, alarms, Logs Insights, and custom metrics
- Lambda troubleshooting: timeouts, memory, concurrency, and error handling
- Caching strategies with ElastiCache, DAX, CloudFront, and API Gateway
- Auto Scaling configuration and optimization
- Performance optimization for DynamoDB, S3, and API Gateway
Key AWS Services in This Domain
Exam Tips for Domain 4
X-Ray annotations are indexed and searchable; metadata is not — use annotations for filtering traces.
CloudWatch embedded metric format lets you emit custom metrics from Lambda without PutMetricData calls.
DAX is a DynamoDB-specific cache; ElastiCache is general-purpose — know when to use each.
For API Gateway 429 errors, check throttling limits; for 504 errors, check Lambda timeout or backend latency.
Practice Domain 4 Questions
Test your knowledge of Troubleshooting and Optimization with practice questions from our DVA-C02 question bank.
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