A Lambda function connected to a DynamoDB Stream throws errors processing events. What is a common cause and fix?

medium📝 Debug Q7 of 15

DynamoDB - with Serverless

AThe function is missing permissions to write to DynamoDB; fix by adding write permissions

BThe function expects NewImage but the event is a deletion; fix by checking event type

CThe DynamoDB table is not encrypted; fix by enabling encryption

DThe Lambda function timeout is too long; fix by reducing timeout

Step-by-Step Solution

Solution:

Step 1: Understand event types in DynamoDB Streams
Deletion events do not have NewImage, only OldImage.
Step 2: Fix Lambda code to handle event types
Check event type before accessing NewImage to avoid errors.
Final Answer:
The function expects NewImage but the event is a deletion; fix by checking event type -> Option B
Quick Check:
Handle deletion events properly = B [OK]

Quick Trick: Check event type before accessing NewImage [OK]

Common Mistakes:

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