Chapter 4 of 4 · AWS DVA-C03
Troubleshooting and Optimization
Logs, metrics, tracing, alarms, debugging, concurrency, messaging and caching.
- 5topics
- 25 minfast track
- 22%of the exam
Topics in this chapter
Take them in order, or jump to the one you need.
- 1Logs, Metrics and TracesRead CloudWatch metrics, logs and X-Ray traces, query logs with Logs Insights and metric filters, and design structured logging…5 min
- 2Custom Metrics, Alerts, Tracing and Health ChecksEmit custom CloudWatch metrics, send alarm notifications, enable X-Ray tracing and set up health checks and probes for DVA-C03…5 min
- 3Debugging Code, Integrations and Deployment FailuresFind the cause of Lambda, API Gateway and SDK errors, read CloudFormation, CodeDeploy and CodeBuild failure output, and use AI…5 min
- 4Concurrency, Memory and Messaging OptimizationTune Lambda reserved and provisioned concurrency, memory, connection pooling, Auto Scaling, and SQS and SNS messaging for DVA-C03…5 min
- 5Caching and Performance Bottleneck DetectionChoose ElastiCache, DAX, CloudFront or API Gateway caching, find performance bottlenecks with CloudWatch and X-Ray, and use AI…5 min
About this chapter
What this chapter covers
This chapter is 22% of the AWS Certified Developer Associate DVA-C03 exam. It covers how a developer finds out what an application is doing, fixes it when it breaks, and makes it faster and cheaper.
The topics are logs, metrics and traces, custom metrics and alarms, X-Ray tracing and health checks, debugging errors and failed deployments, Lambda concurrency and memory tuning, messaging optimization, caching, and bottleneck detection. Several items ask how AWS AI tools help with troubleshooting and optimization.
Questions are developer scenarios with single answer and multiple response formats. Multiple response questions state the count, such as "Which TWO". Look for discriminators like LEAST operational overhead or MOST secure. There are no exhibits.
How the topics fit together
You cannot fix or tune what you cannot see, so observability comes first.
- Observe: structured logs, custom metrics and X-Ray traces make behavior visible.
- Alert: alarms, notifications and health checks tell you or the platform when something goes wrong.
- Debug: error signatures and deployment output point to the cause.
- Optimize: measure first, then tune concurrency, memory, messaging and caches.
When a question names a symptom, choose the tool that shows that symptom directly: metrics for "that", X-Ray for "where", logs for "why". Change settings only after measuring.
How to use these pages
Each topic page has the same shape, so you can skim for what you need.
- What it is: the idea in plain words.
- How it works: the mechanism, with diagrams and examples.
- What to remember for the exam: the facts to memorize.
- Common mistakes: the classic traps.
- Check yourself: three questions to test your understanding.
Pay special attention to the comparison tables. Many questions ask you to choose between two similar options, such as reserved and provisioned concurrency, or DAX and ElastiCache.
Ready for more practice?
The full AWS DVA-C03 question bank has 850 questions, with timed practice exams and an explanation for every answer.
This study guide is independent and is not affiliated with, endorsed by, or sponsored by AWS. Vendor names, certification names and exam codes are trademarks of their respective owners and are used for identification only.