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Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 172 discussion

Exam question from Amazon's AWS Certified Developer - Associate DVA-C02
Question #: 172
Topic #: 1
[All AWS Certified Developer - Associate DVA-C02 Questions]

A mobile app stores blog posts in an Amazon DynamoDB table. Millions of posts are added every day, and each post represents a single item in the table. The mobile app requires only recent posts. Any post that is older than 48 hours can be removed.

What is the MOST cost-effective way to delete posts that are older than 48 hours?

  • A. For each item, add a new attribute of type String that has a timestamp that is set to the blog post creation time. Create a script to find old posts with a table scan and remove posts that are older than 48 hours by using the BatchWriteItem API operation. Schedule a cron job on an Amazon EC2 instance once an hour to start the script.
  • B. For each item, add a new attribute of type String that has a timestamp that is set to the blog post creation time. Create a script to find old posts with a table scan and remove posts that are older than 48 hours by using the BatchWriteItem API operation. Place the script in a container image. Schedule an Amazon Elastic Container Service (Amazon ECS) task on AWS Fargate that invokes the container every 5 minutes.
  • C. For each item, add a new attribute of type Date that has a timestamp that is set to 48 hours after the blog post creation time. Create a global secondary index (GSI) that uses the new attribute as a sort key. Create an AWS Lambda function that references the GSI and removes expired items by using the BatchWriteItem API operation. Schedule the function with an Amazon CloudWatch event every minute.
  • D. For each item, add a new attribute of type Number that has a timestamp that is set to 48 hours after the blog post creation time. Configure the DynamoDB table with a TTL that references the new attribute.
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Suggested Answer: D 🗳️
by fordiscussionstwo at Oct. 6, 2023, 2:26 a.m.
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65703c1
5 months ago
Selected Answer: D
D is the correct answer.
upvoted 2 times
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SerialiDr
9 months, 1 week ago
Selected Answer: D
This is the most cost-effective and efficient solution. The TTL feature allows DynamoDB to automatically delete items past a certain timestamp, which is perfect for this use case. By adding a TTL attribute to each item (set to 48 hours after the post creation time), DynamoDB will automatically delete the items when they expire, without any need for custom scripts, additional AWS services, or manual intervention.
upvoted 2 times
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dilleman
1 year ago
Selected Answer: D
D is correct. DynamoDB tables can clean up data itself based on provided configuration.
upvoted 3 times
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Digo30sp
1 year ago
Selected Answer: D
The correct answer is (D). Solution (D) is the most cost-effective because it uses DynamoDB's Time to Live (TTL) to automatically remove expired items. The TTL is an item attribute that specifies the duration of time that an item should remain in the table. When an item's TTL expires, the item is automatically deleted from the table.
upvoted 3 times
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