Third highest weight domain. Focuses on making existing architectures better — more observable, more cost-efficient, more reliable, and more performant. Expect ~16 questions.

What This Domain Tests

• Improving observability with CloudWatch, CloudTrail, X-Ray, and Systems Manager
• Optimizing costs with Cost Explorer, Compute Optimizer, and Trusted Advisor
• Improving reliability with Well-Architected reviews, Backup, and resilience patterns
• Identifying and resolving performance bottlenecks
• Automating operational tasks with Systems Manager
• Managing service quotas and capacity

Subdomain Breakdown

Task names aligned to the official SAP-C02 exam guide. The guide may change; recheck before exam day.

Files in This Domain

Monitoring/

• CloudWatch-General.md — metrics, alarms, dashboards, Logs Insights, Container Insights
• CloudTrail-General.md — trails, event history, Lake, Insights
• XRay-General.md — distributed tracing, service maps, sampling
• SystemsManager-General.md — Parameter Store, Secrets Manager, Run Command, Patch Manager, Session Manager

CostOptimization/

• CostExplorer-General.md — cost analysis, forecasting, rightsizing
• ComputeOptimizer-General.md — ML-based rightsizing recommendations
• TrustedAdvisor-General.md — checks across six categories; plan availability changes over time

Standalone

• WellArchitected-Tool-General.md — framework reviews, lenses, improvement plans
• Backup-General.md — centralized backup, policies, cross-region, cross-account
• Resilience-Patterns-General.md — DR strategies, RTO/RPO, multi-region patterns
• Elastic-Disaster-Recovery-General.md — block replication, drills, recovery launch, failback
• ServiceQuotas-General.md — quota management, monitoring, increase requests

Key Architecture Patterns

Observability Stack

Application → CloudWatch Metrics + Logs
           → X-Ray Traces
           → CloudTrail API Audit
           → CloudWatch Dashboards + Alarms → SNS → PagerDuty/Slack

Cost Optimization Loop

Cost Explorer (analyze) → Compute Optimizer (rightsize)
→ Trusted Advisor (check) → Savings Plans (commit)
→ S3 Lifecycle (tier) → Reserved Capacity (plan)

Reliability Improvement

Well-Architected Review → identify gaps
→ AWS Backup (protect data)
→ Multi-AZ / Multi-Region (reduce selected failure risks)
→ Auto Scaling (handle load)
→ Route 53 health checks (detect failures)

Exam Tips

• CloudWatch is the answer for metrics, alarms, and log aggregation — know Logs Insights queries
• X-Ray is the answer for distributed tracing and latency analysis across microservices
• Systems Manager replaces SSH/RDP — Session Manager, Run Command, Patch Manager
• Compute Optimizer = ML-based rightsizing; Trusted Advisor = broad best practice checks
• AWS Backup = centralized, policy-driven backup across services and accounts
• Well-Architected Tool = structured review against the 6 pillars — know the pillars cold
• DR strategies: Backup/Restore → Pilot Light → Warm Standby → Multi-Site Active-Active (increasing cost and decreasing RTO)
• Service Quotas + CloudWatch alarms = proactive quota monitoring before hitting limits