Exam AWS Certified Solutions Architect - Professional All Questions

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Exam AWS Certified Solutions Architect - Professional topic 1 question 684 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Professional

Question #: 684
Topic #: 1

[All AWS Certified Solutions Architect - Professional Questions]

A company is planning a large event where a promotional offer will be introduced. The company's website is hosted on AWS and backed by an Amazon RDS for
PostgreSQL DB instance. The website explains the promotion and includes a sign-up page that collects user information and preferences. Management expects large and unpredictable volumes of traffic periodically, which will create many database writes. A solutions architect needs to build a solution that does not change the underlying data model and ensures that submissions are not dropped before they are committed to the database.
Which solution meets these requirements?

A. Immediately before the event, scale up the existing DB instance to meet the anticipated demand. Then scale down after the event.
B. Use Amazon SQS to decouple the application and database layers. Configure an AWS Lambda function to write items from the queue into the database.
C. Migrate to Amazon DynamoDB and manage throughput capacity with automatic scaling.
D. Use Amazon ElastiCache for Memcached to increase write capacity to the DB instance.

Show Suggested Answer

Suggested Answer: B 🗳️

by liono at Nov. 8, 2020, 11:21 a.m.

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Comments

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petebear55

Highly Voted 3 years, 8 months ago

Come on Guys !! .. Ive seen the discussions below ... if you can not get this one then you are no where near to taking the exam !! .. the problem here is a WRITE issue .. so for that we would use SQS to help hold the solution until it is ready to be written ... Elastichche is for caching solution .. so we would use that in READ situation .... ANSWER IS B .. really concerned why the incorrect answer appears in the answer box

upvoted 47 times

PAUGURU

3 years, 8 months ago

Agree 100%, these questions are the easy ones...

upvoted 7 times

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student22

3 years, 7 months ago

Well said! Answers in the answer box make me worried. It's good that we have a great community here.

upvoted 6 times

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ryu10_09

3 years, 6 months ago

maybe you should not take the exam yourself. havn't you heard of write-through cache before: https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/Strategies.html#Strategies.WriteThrough

upvoted 2 times

gerhardbl

2 years, 10 months ago

I guess you kind of just proved his point.

upvoted 3 times

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redipa

3 years ago

caching is for read speed. write-through cache doesn't increase write speed to the DB, it just means any new writes to the DB are also written to the cache along the way.

upvoted 3 times

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smartassX

Highly Voted 3 years, 8 months ago

B is the answer! SQS with Lambda.

upvoted 31 times

beso

3 years, 8 months ago

SQS with lambda is eventually consistent, we are looking here for strong consistent which is option A?

upvoted 1 times

petebear55

3 years, 7 months ago

"large and unpredictable volumes of traffic periodically" beso a can not be the answer

upvoted 3 times

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petebear55

3 years, 7 months ago

WELL DONE

upvoted 1 times

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evargasbrz

Most Recent 2 years, 5 months ago

Selected Answer: B

I'll go with B

upvoted 1 times

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skywalker

2 years, 8 months ago

Selected Answer: B

B.. SQS to capture new writes before storing in DB will help D is wrong as it only provide enhancement during READ operation.

upvoted 1 times

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kangtamo

2 years, 11 months ago

Selected Answer: B

Agree with B: SQS.

upvoted 1 times

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user0001

3 years ago

A :because they dont want to introduce change "A solutions architect must provide a solution that does not alter the underlying data architecture" B would be better if they do allow changes

upvoted 1 times

Cal88

2 years, 7 months ago

They don’t wanna introduce change to the “data mode” so no change to the DB type. No one said anything about changing the way to process the writes. if you choose A , what capacity will you chose to scale up? Remember its unpredictable traffic which a really important keyword in the question. B is the best way to achieve what is asked in the question

upvoted 2 times

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vbal

3 years, 6 months ago

D is NOT correct. The write-through strategy adds data or updates data in the cache whenever data is written to the database. Every write involves two trips: A write to the cache A write to the database Which adds latency to the process.

upvoted 1 times

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AzureDP900

3 years, 6 months ago

going with B

upvoted 1 times

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ryu10_09

3 years, 6 months ago

I would still go with using memcached and the write-through capabilities for it:https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/Strategies.html#Strategies.WriteThrough SQS is also an option here

upvoted 1 times

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tgv

3 years, 7 months ago

BBB ---

upvoted 1 times

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blackgamer

3 years, 7 months ago

B is the answer.

upvoted 1 times

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tiffanny

3 years, 7 months ago

lol but in real life, aws user are using A option. LOL because they are too lazy to change the infra.

upvoted 1 times

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mustpassla

3 years, 7 months ago

B, use SQS to ensures that submissions are not dropped. A is not correct as scaling up manually cant help as the volumes of traffic are unpredictable.

upvoted 4 times

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