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Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 472 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C03
Question #: 472
Topic #: 1
[All AWS Certified Solutions Architect - Associate SAA-C03 Questions]

A company has a mobile chat application with a data store based in Amazon DynamoDB. Users would like new messages to be read with as little latency as possible. A solutions architect needs to design an optimal solution that requires minimal application changes.

Which method should the solutions architect select?

  • A. Configure Amazon DynamoDB Accelerator (DAX) for the new messages table. Update the code to use the DAX endpoint.
  • B. Add DynamoDB read replicas to handle the increased read load. Update the application to point to the read endpoint for the read replicas.
  • C. Double the number of read capacity units for the new messages table in DynamoDB. Continue to use the existing DynamoDB endpoint.
  • D. Add an Amazon ElastiCache for Redis cache to the application stack. Update the application to point to the Redis cache endpoint instead of DynamoDB.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by nosense at May 16, 2023, 8:44 p.m.
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pentium75
9 months ago
Selected Answer: A
B and C do not reduce latency. D would reduce latency but require significant application changes.
upvoted 2 times
wizcloudifa
5 months, 1 week ago
D would not reduce latency, all the messages are new, they wont be stored in cache and they are unique messages(dynamic content) so Elasticache would be pointless here, its more preferable for static content/frequently accessed content.... A makes perfect sense
upvoted 3 times
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Cyberkayu
9 months, 2 weeks ago
Selected Answer: C
0 code change @C ABD. In memory cache, read replica, elasticache. Chat application and content is dynamic, cache will still pull data from prod database
upvoted 1 times
pentium75
9 months ago
C has 0 codes changes but doesn't address the issue.
upvoted 6 times
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danielmakita
11 months ago
Would go for A. Minimal application changes != No application changes
upvoted 2 times
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thanhnv142
11 months, 2 weeks ago
"requires minimal application changes" - Do not choose A because it requires updates of codes.
upvoted 1 times
thanhnv142
11 months, 2 weeks ago
C is correct A, B and D all require code changes to the app.
upvoted 1 times
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Guru4Cloud
1 year, 1 month ago
Selected Answer: A
A. Configure Amazon DynamoDB Accelerator (DAX) for the new messages table. Update the code to use the DAX endpoint.
upvoted 2 times
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haoAWS
1 year, 3 months ago
Selected Answer: A
Read replica does improve the read speed, but it cannot improve the latency because there is always latency between replicas. So A works and B not work.
upvoted 2 times
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mattcl
1 year, 3 months ago
C , "requires minimal application changes"
upvoted 1 times
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TariqKipkemei
1 year, 3 months ago
Selected Answer: A
little latency = Amazon DynamoDB Accelerator (DAX) .
upvoted 4 times
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DrWatson
1 year, 3 months ago
Selected Answer: A
I go with A https://aws.amazon.com/blogs/mobile/building-a-full-stack-chat-application-with-aws-and-nextjs/ but I have some doubts about this https://aws.amazon.com/blogs/database/how-to-build-a-chat-application-with-amazon-elasticache-for-redis/
upvoted 3 times
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cloudenthusiast
1 year, 4 months ago
Selected Answer: A
Amazon DynamoDB Accelerator (DAX): DAX is an in-memory cache for DynamoDB that provides low-latency access to frequently accessed data. By configuring DAX for the new messages table, read requests for the table will be served from the DAX cache, significantly reducing the latency. Minimal Application Changes: With DAX, the application code can be updated to use the DAX endpoint instead of the standard DynamoDB endpoint. This change is relatively minimal and does not require extensive modifications to the application's data access logic. Low Latency: DAX caches frequently accessed data in memory, allowing subsequent read requests for the same data to be served with minimal latency. This ensures that new messages can be read by users with minimal delay.
upvoted 4 times
cloudenthusiast
1 year, 4 months ago
Option B (Add DynamoDB read replicas) involves creating read replicas to handle the increased read load, but it may not directly address the requirement of minimizing latency for new message reads.
upvoted 1 times
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Efren
1 year, 4 months ago
Tricky one, in doubt also with B, read replicas.
upvoted 1 times
awsgeek75
8 months, 3 weeks ago
Yes it's tricky but least code changes is the tie breaker. DAX has zero code changes.
upvoted 2 times
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nosense
1 year, 4 months ago
Selected Answer: A
a is valid
upvoted 3 times
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