Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 308 discussion

B & D https://aws.amazon.com/premiumsupport/knowledge-center/trusted-advisor-cost-optimization/

I would go with B and C as the company is running for 90 days and C option is basing on 30 days report which would mean that there is higher potential on cost saving rather than on idle instances

A: AWS Trusted Advisor recommendations for RDS cost optimization are only available within the AWS account where the instances are running. The consolidated billing (payer) account does not provide detailed service-level checks for linked accounts. Therefore, the finance team must access the Trusted Advisor check directly from the AWS account that owns the RDS instances to see relevant recommendations. C: The company has been using high-performance RDS instances for 90 days, which indicates a long-term workload. Reserved Instances (RIs) offer significant cost savings compared to On-Demand pricing when committing to one or three years. Trusted Advisor identifies instances with consistent usage and recommends RIs to reduce costs, making this the most relevant check for optimizing expenses. Even after 90 days, purchasing an RI for the remaining duration still provides substantial savings.

The answer is either BC or BD, depending on how you interpret "The company runs several active... instances for 90 days for 90 days." D: it assumes the instances will only run for 90 days, so reserved instances can't be the answer, since it requires 1-3 years utilization. C: it assumes there is no idle instances since they've been active for the last 90 days.

B: Use the Trusted Advisor recommendations from the consolidated billing account to see all RDS instance checks at the same time. This option allows the finance team to see all RDS instance checks across all AWS accounts in one place. Since the company uses consolidated billing, this account will have access to all of the AWS accounts' Trusted Advisor recommendations. C: Review the Trusted Advisor check for Amazon RDS Reserved Instance Optimization. This check can help identify cost savings opportunities for RDS by identifying instances that can be covered by Reserved Instances. This can result in significant savings on RDS costs.

BD is the answer-Amazon Redshift Reserved Node Optimization and Relational Database Service (RDS) Reserved Instance Optimization check are not available to accounts linked in consolidated billing.

"you can reserve a DB instance for a one- or three-year term". We only have data for 90 days. I feel it too risky to commit for 1/3 year(s) without information on future usage. If we knew that we expected the same usage pattern for the next 1,2,3 years, Id agree with C.

B) Use the Trusted Advisor recommendations from the consolidated billing account to see all RDS instance checks at the same time. This option allows the finance team to see all RDS instance checks across all AWS accounts in one place. Since the company uses consolidated billing, this account will have access to all of the AWS accounts' Trusted Advisor recommendations. C) Review the Trusted Advisor check for Amazon RDS Reserved Instance Optimization. This check can help identify cost savings opportunities for RDS by identifying instances that can be covered by Reserved Instances. This can result in significant savings on RDS costs.

https://aws.amazon.com/premiumsupport/knowledge-center/trusted-advisor-cost-optimization/

Insights: The company runs several active high performance Amazon RDS for Oracle On-Demand DB instances for 90 days So it's clear that this company need to check the configuration of any Amazon Relational Database Service (Amazon RDS) for any database (DB) instances that appear to be idle.

B&C AWS Trusted Advisor is an online resource to help you reduce cost, increase performance, and improve security by optimizing your AWS environment. (...) Recommendations are based on the previous calendar month's hour-by-hour usage aggregated across all consolidated billing accounts. https://docs.aws.amazon.com/whitepapers/latest/cost-optimization-reservation-models/aws-trusted-advisor.html Amazon EC2 Reserved Instance Optimization: An important part of using AWS involves balancing your Reserved Instance (RI) purchase against your On-Demand Instance usage. This check provides recommendations on which RIs will help reduce the costs incurred from using On-Demand Instances. We create these recommendations by analyzing your On-Demand usage for the past 30 days. We then categorizing the usage into eligible categories for reservations. https://docs.aws.amazon.com/awssupport/latest/user/cost-optimization-checks.html#amazon-ec2-reserved-instances-optimization

If you're choosing D for the idle instances, Amazon RDS Reserved Instance Optimization Trusted Advisor check includes recommendations related to underutilized and idle RDS instances. It helps identify instances that are not fully utilized and provides recommendations on how to optimize costs, such as resizing or terminating unused instances, or purchasing reserved instances to match usage patterns more efficiently.

Reserved Instances can be shared across accounts, and that is the reason why we need to check the consolidated bill.

BC we don't want to check Idle instances because the instances were active for last 90 days. Idle means it was inactive for at least 7 days.

BD we don't want to check Idle instances because the instances were active for last 90 days. Idle means it was inactive for at least 7 days.

Reserved Instance Optimization "checks your usage of RDS and provides recommendations on purchase of Reserved Instances to help reduce costs incurred from using RDS On-Demand." In other words, it is not about optimizing reserved instances (as many here think), it about optimizing on-demand instances by converting them to reserved ones. "Idle DB Instances" check is about databases that have "not had a connection for a prolonged period of time", which we know is not the case here.

why no one considers AD. C is not the option since reserved instance is considered in case of long-term usage while it is 90 days here. But B is using consolidated billing which covers the high level billing overview of cost but not that specific for RDS running instance. should we only need to use Trust advisor for accounts where RDS is running?