Web Page View and Click Tracking: Key Statistics with AWS Lambda

Correct Answer- A.

Potentially, more than one option may work.

However, this question asks the most cost-efficient and straightforward method that needs to be considered.

Option A is CORRECT because the AWS CloudWatch Events rule is free and quite easy to begin with.

To schedule a daily event at 8:00 AM GMT, you just need to set up a cron rule, as given in the below screenshot.

Option B is incorrect: Because launching a new EC2 instance for this task is not cost-efficient.

Option C is incorrect: Because this is not something AWS Batch works.

For AWS Batch, it runs as a containerized application on an Amazon EC2 instance in your computing environment.

Option D is incorrect: Because firstly, it should be “Create rule” rather than “Create Event”

Secondly, the Cron expression of “ * ? * * 08 00” is incorrect.

For More information, Please check below AWS Docs:

https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html

Option A is the correct answer. You should create an AWS CloudWatch Events rule that is scheduled using a cron expression, and configure the target as the Lambda function.

AWS Lambda is a serverless compute service that allows you to run code without provisioning or managing servers. CloudWatch Events is a service that enables you to respond to events in the AWS ecosystem. By using CloudWatch Events, you can trigger actions in response to events in AWS services.

In this scenario, you want to track page views and clicks every day at 8:00 AM. Therefore, you need to schedule a CloudWatch Events rule to run at 8:00 AM every day.

A cron expression is a string that specifies a set of times using the format:

sqlCopy code
minute hour day-of-month month day-of-week year 

The following cron expression will run the Lambda function every day at 8:00 AM:

Copy code
0 8 * * ? 

To create a CloudWatch Events rule that triggers the Lambda function, follow these steps:

1. Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/.
2. In the navigation pane, choose "Events," and then choose "Create rule."
3. On the "Create Rule" page, choose "Schedule" for the "Event Source" section.
4. In the "Schedule expression" section, choose "Cron expression," and then enter the cron expression "0 8 * * ?".
5. Choose "Add target," and then choose "Lambda function."
6. In the "Function" section, choose your Lambda function from the drop-down menu.
7. Choose "Configure details," and then enter a name and description for your rule.
8. Choose "Create rule" to create the CloudWatch Events rule.

Option B is incorrect because it involves setting up an EC2 instance and using AWS CLI to call the Lambda function. This approach requires managing and maintaining an EC2 instance, which can be time-consuming and less cost-effective compared to using a serverless approach with AWS Lambda.

Option C is incorrect because Amazon Batch is not suitable for scheduling recurring tasks like this. Amazon Batch is designed for running batch computing workloads, which typically involve running jobs in parallel across multiple EC2 instances.

Option D is incorrect because the cron expression provided is not correct. The expression " * ? * * 08 00" is not a valid cron expression. The correct expression to run the Lambda function at 8:00 AM every day is "0 8 * * ?".