If a Lambda function processes DynamoDB Stream events and filters only updates where the attribute "status" changed to "completed", what will happen when an item is updated from {"status": "pending"} to {"status": "completed"}?

medium📝 Predict Output Q5 of 15

DynamoDB - with Serverless

AThe Lambda function throws an error due to missing data

BThe Lambda function processes the event and triggers downstream actions

CThe Lambda function ignores the event because status changed

DThe Lambda function processes the event but does not trigger actions

Step-by-Step Solution

Solution:

Step 1: Understand event filtering logic
The Lambda function filters events where status changes to "completed".
Step 2: Check the update condition
The status changed from "pending" to "completed", so the condition is met.
Final Answer:
The Lambda function processes the event and triggers downstream actions -> Option B
Quick Check:
Status change to completed triggers processing = C [OK]

Quick Trick: Lambda triggers only on matching status changes [OK]

Common Mistakes:

MISTAKES

Assuming Lambda ignores status changes
Expecting errors on valid updates
Thinking Lambda processes but skips actions

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More DynamoDB Quizzes

If a Lambda function processes DynamoDB Stream events and filters only updates where the attribute "status" changed to "completed", what will happen when an item is updated from {"status": "pending"} to {"status": "completed"}?

Step 1: Understand event filtering logic

Step 2: Check the update condition

Final Answer:

Quick Check:

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