AWS - DynamoDB
You want to automatically remove expired items from a DynamoDB table and also trigger a notification when deletion happens. How can you achieve this?
You want to automatically remove expired items from a DynamoDB table and also trigger a notification when deletion happens. How can you achieve this?
hard📝 Best Practice Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Use TTL for automatic deletion
Enable TTL to let DynamoDB delete expired items automatically.Step 2: Use DynamoDB Streams to detect deletions
DynamoDB Streams capture item deletions, which can trigger Lambda functions.Step 3: Lambda sends notifications
Lambda can send notifications (e.g., via SNS) when deletions occur.Final Answer:
Enable TTL on the table and use DynamoDB Streams to trigger a Lambda function for notifications -> Option CQuick Check:
TTL + Streams + Lambda = auto delete + notify [OK]
Quick Trick: Combine TTL with Streams and Lambda for notifications [OK]
Common Mistakes:
MISTAKES- Expecting SNS directly on table without Streams
- Using scheduled Lambda instead of TTL
- Relying on CloudWatch alarms for deletions
Master "DynamoDB" in AWS
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