AWS Certified Solutions Architect - Associate
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A company has multiple AWS accounts that use consolidated billing. The company runs several active high performance Amazon RDS for Oracle On-Demand DB instances for 90 days. The company's finance team has access to AWS Trusted Advisor in the consolidated billing account and all other AWS accounts.
The finance team needs to use the appropriate AWS account to access the Trusted Advisor check recommendations for RDS. The finance team must review the appropriate Trusted Advisor check to reduce RDS costs.
Which combination of steps should the finance team take to meet these requirements? (Choose two.)
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A
Use the Trusted Advisor recommendations from the account where the RDS instances are running.
B
Use the Trusted Advisor recommendations from the consolidated billing account to see all RDS instance checks at the same time.
C
Review the Trusted Advisor check for Amazon RDS Reserved Instance Optimization.
D
Review the Trusted Advisor check for Amazon RDS Idle DB Instances.
E
Review the Trusted Advisor check for Amazon Redshift Reserved Node Optimization.
Explanation:
Explanation
Correct Answers: A and C
Why A is correct:
- Trusted Advisor checks for RDS Reserved Instance Optimization are specific to individual accounts where the RDS instances are running.
- The consolidated billing account aggregates billing information but does not provide detailed service-specific optimization recommendations for resources in linked accounts.
- To get accurate RDS optimization recommendations, the finance team must access Trusted Advisor from the account where the RDS instances are actually deployed.
Why C is correct:
- The company has been running RDS On-Demand instances for 90 days, which makes them eligible for Reserved Instance purchases.
- Amazon RDS Reserved Instance Optimization is a Trusted Advisor check that identifies opportunities to purchase Reserved Instances for RDS databases that have been running for a significant period.
- Reserved Instances can provide significant cost savings (up to 75% compared to On-Demand pricing) for steady-state workloads.
Why other options are incorrect:
B: The consolidated billing account cannot show all RDS instance checks at the same time for linked accounts. Trusted Advisor checks are account-specific.
D: The RDS Idle DB Instances check identifies databases with low utilization, but the question states the instances are "active high performance" and running for 90 days, so they are not idle.
E: Amazon Redshift is a different service (data warehousing) and not relevant to RDS Oracle databases.
Key AWS Concepts:
- Trusted Advisor: Provides real-time guidance to help provision resources following AWS best practices.
- Consolidated Billing: Aggregates billing from multiple AWS accounts but does not aggregate service-specific optimization recommendations.
- RDS Reserved Instances: Provide significant cost savings for long-running database instances compared to On-Demand pricing.
- 90-day threshold: AWS typically recommends considering Reserved Instances for workloads that run consistently for at least 90 days.
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