AWS - Lambda
You want a Lambda function to run every day at 6 AM UTC without any external event. Which AWS service and configuration should you use to trigger the Lambda?
You want a Lambda function to run every day at 6 AM UTC without any external event. Which AWS service and configuration should you use to trigger the Lambda?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Identify scheduled triggers for Lambda
To run Lambda on a schedule without external events, use CloudWatch Events (EventBridge) rules.Step 2: Use cron expression in EventBridge
Create a rule with a cron expression for 6 AM UTC daily to trigger the Lambda function automatically.Final Answer:
Create a CloudWatch Events (EventBridge) rule with a cron expression to trigger Lambda -> Option BQuick Check:
Scheduled Lambda uses EventBridge cron rule = B [OK]
Quick Trick: Use EventBridge cron rules for scheduled Lambda runs [OK]
Common Mistakes:
MISTAKES- Trying to trigger Lambda via S3 or SQS for schedule
- Assuming DynamoDB Streams can schedule events
- Not using cron expressions for timing
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