AWS Certified Data Analytics Specialty 2021 – Hands-On - DynamoDB TTL

The video tutorial explains the concept of Time to Live (TTL) in DynamoDB, which allows automatic deletion of items after a specified expiry timestamp. It covers the TTL expiration process, its benefits, and use cases such as data reduction and regulatory compliance. The tutorial also provides a hands-on demonstration of creating a TTL table, defining TTL attributes, and running previews to simulate item expiration.

What is the primary purpose of using Time to Live (TTL) in DynamoDB?

• To increase the read capacity units

• To automatically delete items after a specified time

• To enhance data encryption

• To improve write performance

How long can expired items remain in DynamoDB before they are guaranteed to be deleted?

• 24 hours

• 48 hours

• 72 hours

• 12 hours

What happens to expired items that have not yet been deleted in DynamoDB?

• They are immediately removed from all queries

• They are moved to a separate table

• They remain visible in reads and scans

• They are archived for future retrieval

Which of the following is a use case for implementing TTL in DynamoDB?

• Improving query performance

• Enhancing data encryption

• Reducing stored data by keeping only current items

• Increasing the number of partitions

What is the first step in creating a table with TTL in DynamoDB?

• Setting the sort key

• Defining the partition key

• Running a preview of deletions

• Enabling CloudWatch metrics

How can you check which items will be deleted when TTL is enabled?

• By running a preview

• By using the AWS CLI

• By checking the error logs

• By querying the backup table

What tool can be used to monitor the number of items deleted by TTL in the last 24 hours?

• AWS Config

• CloudWatch metrics

• Amazon S3

• AWS Lambda