AWS - DynamoDB
You want to trigger a Lambda function whenever an item is updated in your DynamoDB table to process both the old and new item images. Which DynamoDB Streams configuration and setup is required?
You want to trigger a Lambda function whenever an item is updated in your DynamoDB table to process both the old and new item images. Which DynamoDB Streams configuration and setup is required?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Choose StreamViewType for updates
To capture both before and after update data, use NEW_AND_OLD_IMAGES.Step 2: Configure Lambda trigger on the DynamoDB Stream
Lambda triggers must be set on the stream, not directly on the table.Final Answer:
Enable Streams with StreamViewType NEW_AND_OLD_IMAGES and configure Lambda trigger on the stream -> Option AQuick Check:
Lambda trigger on stream with NEW_AND_OLD_IMAGES [OK]
Quick Trick: Use NEW_AND_OLD_IMAGES and trigger Lambda on stream [OK]
Common Mistakes:
- Triggering Lambda directly on table instead of stream
- Choosing KEYS_ONLY or OLD_IMAGE for update data
- Not enabling Streams before Lambda trigger
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