Exam AWS Certified Solutions Architect - Associate SAA-C03 All Questions

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Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 145 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C03

Question #: 145
Topic #: 1

[All AWS Certified Solutions Architect - Associate SAA-C03 Questions]

A company hosts a website analytics application on a single Amazon EC2 On-Demand Instance. The analytics software is written in PHP and uses a MySQL database. The analytics software, the web server that provides PHP, and the database server are all hosted on the EC2 instance. The application is showing signs of performance degradation during busy times and is presenting 5xx errors. The company needs to make the application scale seamlessly.
Which solution will meet these requirements MOST cost-effectively?

A. Migrate the database to an Amazon RDS for MySQL DB instance. Create an AMI of the web application. Use the AMI to launch a second EC2 On-Demand Instance. Use an Application Load Balancer to distribute the load to each EC2 instance.
B. Migrate the database to an Amazon RDS for MySQL DB instance. Create an AMI of the web application. Use the AMI to launch a second EC2 On-Demand Instance. Use Amazon Route 53 weighted routing to distribute the load across the two EC2 instances.
C. Migrate the database to an Amazon Aurora MySQL DB instance. Create an AWS Lambda function to stop the EC2 instance and change the instance type. Create an Amazon CloudWatch alarm to invoke the Lambda function when CPU utilization surpasses 75%.
D. Migrate the database to an Amazon Aurora MySQL DB instance. Create an AMI of the web application. Apply the AMI to a launch template. Create an Auto Scaling group with the launch template Configure the launch template to use a Spot Fleet. Attach an Application Load Balancer to the Auto Scaling group.

Show Suggested Answer

Suggested Answer: D 🗳️

by Six_Fingered_Jose at Oct. 26, 2022, 7:04 p.m.

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Comments

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Konb

Highly Voted 2 years, 1 month ago

Selected Answer: D

I was tempted to pick A but then I realized there are two key requirements: - scale seamlessly - cost-effectively None of A-C give seamless scalability. A and B are about adding second instance (which I assume does not match to "scale seamlessly"). C is about changing instance type. Therefore D is only workable solution to the scalability requirement

upvoted 21 times

hpirnaj

5 months, 3 weeks ago

Aurora is way more expensive than MySQL. but . I would still pick option D because it will scale seamlessly with ASG and Aurora . A is not scale at all

upvoted 1 times

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pbpally

2 years, 1 month ago

Yup. Got me too. I picked A, saw D, and then reread the "scale seamlessly" part. D is correct.

upvoted 6 times

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NayeraB

1 year, 4 months ago

But wouldn't RDS scale as well? Also Spot instances seems like a bit of a risky decision

upvoted 2 times

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genny

Highly Voted 2 years, 2 months ago

Selected Answer: A

I wouldn't run my website on spot instances. Spot instances might be terminated at any time, and since I need to run analytics application it's not an option for me. And using route 53 for load balancing of 2 instances is an overkill. I go with A.

upvoted 12 times

AZ_Master

1 year, 7 months ago

It is spot fleet - not spot instances. They can include On-Demand instances and can also maintain the target capacity automatically. ---- A Spot Fleet is a set of Spot Instances and optionally On-Demand Instances that is launched based on criteria that you specify. The Spot Fleet selects the Spot capacity pools that meet your needs and launches Spot Instances to meet the target capacity for the fleet. By default, Spot Fleets are set to maintain target capacity by launching replacement instances after Spot Instances in the fleet are terminated. Ref: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-fleet.html

upvoted 15 times

eb7be10

1 year, 2 months ago

While Spot Fleet is temporary, the Auto-Scaling Group builds it back again and again. D is the best answer.

upvoted 2 times

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network_enthusiast

Most Recent 2 months, 2 weeks ago

Selected Answer: D

D is the answer

upvoted 1 times

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zdi561

4 months, 4 weeks ago

Selected Answer: D

Both ec2 and db scale better in D.

upvoted 1 times

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satyaammm

4 months, 4 weeks ago

Selected Answer: D

Only D refers to seamlessly scale ... rest are about increasing the number of instances or the size of the instance.

upvoted 1 times

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Rcosmos

5 months, 2 weeks ago

Selected Answer: D

Conclusão: A opção D é a solução mais econômica e eficaz porque combina o poder de escalabilidade automática do grupo de Auto Scaling, a economia das instâncias Spot, e a alta performance do Amazon Aurora MySQL. Essa abordagem atende aos requisitos de custo, desempenho e escalabilidade de forma abrangente.

upvoted 1 times

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PaulGa

8 months, 2 weeks ago

Selected Answer: D

Ans D - Like Konb (1 year, 5 months ago) I almost picked A, but for the same reasons of seamless scaling it has to be D

upvoted 2 times

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carlossarmient

9 months ago

D aswer is forcing you to use the new "feature" of aws. if you have a performance issue with the ddbb, front and back all in on your ec2 intances. the best way to solve that issue is move de ddbb to RDS and create a new ec2 intances. BUT we need to sell the aws unique service.

upvoted 2 times

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PaulGa

9 months, 1 week ago

Selected Answer: D

Ans D - I was tempted with AAns D - I was tempted with A but then thought that's too obvious and scaling might be an issue... so looking at Spot Fleets "Fleets provide the following features and benefits, enabling you to maximize cost savings and optimize availability and performance when running applications on multiple EC2 instances" it has to be Ans D. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Fleets.html

upvoted 2 times

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bignatov

10 months ago

Selected Answer: A

Option A is the best balance between cost-effectiveness and scalability. It allows the application to scale horizontally with minimal changes while ensuring the database is managed and can scale independently, reducing the risk of performance degradation during peak times.

upvoted 1 times

bignatov

10 months ago

i think it is not D, because amazon aurora is much expensive and also the spot instances can be interrupted, even they are most cost effective in the requirements is not mentioned that the workload is stateless and can be interrupted.

upvoted 2 times

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maryam_sh

10 months, 3 weeks ago

Selected Answer: A

A, not D > Using Spot Instances with an Auto Scaling group adds complexity and risk to the infrastructure

upvoted 1 times

MatAlves

10 months ago

It is not "spot instances", but "spot fleet". A Spot Fleet is a set of Spot Instances and optionally On-Demand Instances that is launched based on criteria that you specify. The Spot Fleet selects the Spot capacity pools that meet your needs and launches Spot Instances to meet the target capacity for the fleet. By default, Spot Fleets are set to maintain target capacity by launching replacement instances after Spot Instances in the fleet are terminated. Ref: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-fleet.html

upvoted 1 times

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jaradat02

11 months ago

Selected Answer: D

I don't think D is the optimal solution. We certainly can find other solutions that are more cost effective and fulfill the same requirements, but among the provided options, I think D is the most reasonable.

upvoted 2 times

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gt520490aws

1 year ago

PHP....

upvoted 1 times

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awsgeek75

1 year, 5 months ago

Selected Answer: D

I'll pick D because it sounds fun :)

upvoted 4 times

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pentium75

1 year, 6 months ago

Selected Answer: D

"Scale seamlessly", none of A-C include scaling at all.

upvoted 2 times

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xdkonorek2

1 year, 7 months ago

Selected Answer: D

spot instance receives 2 minutes interruption notice, it should be enough for requests to finish, it's quite unusal for app to run longer requests only option D allow for seamless scaling with autoscaling group

upvoted 2 times

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BrijMohan08

1 year, 9 months ago

Selected Answer: B

Option B is a cost-effective choice that combines the benefits of database migration to RDS, horizontal scaling with EC2 instances, and control over traffic distribution with Route 53 weighted routing, making it the best solution for the given requirements.

upvoted 2 times

pentium75

1 year, 6 months ago

But there's no scaling at all in B.

upvoted 4 times

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