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Question 458 - SAP-C02 discussion

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A software as a service (SaaS) company has developed a multi-tenant environment. The company uses Amazon DynamoDB tables that the tenants share tor the storage layer. The company uses AWS Lambda functions for the application services.

The company wants to offer a tiered subscription model that is based on resource consumption by each tenant Each tenant is identified by a unique tenant ID that is sent as part of each request to the Lambda functions The company has created an AWS Cost and Usage Report (AWS CUR) in an AWS account The company wants to allocate the DynamoDB costs to each tenant to match that tenant's resource consumption

Which solution will provide a granular view of the DynamoDB cost for each tenant with the LEAST operational effort?

A.
Associate a new lag that is named tenant ID with each table in DynamoDB Activate the tag as a cost allocation tag m the AWS Billing and Cost Management console Deploy new Lambda function code to log the tenant ID in Amazon CloudWatch Logs Use the AWS CUR to separate DynamoDB consumption cost for each tenant ID
Answers
A.
Associate a new lag that is named tenant ID with each table in DynamoDB Activate the tag as a cost allocation tag m the AWS Billing and Cost Management console Deploy new Lambda function code to log the tenant ID in Amazon CloudWatch Logs Use the AWS CUR to separate DynamoDB consumption cost for each tenant ID
B.
Configure the Lambda functions to log the tenant ID and the number of RCUs and WCUs consumed from DynamoDB for each transaction to Amazon CloudWatch Logs Deploy another Lambda function to calculate the tenant costs by using the logged capacity units and the overall DynamoDB cost from the AWS Cost Explorer API Create an Amazon EventBridge rule to invoke the calculation Lambda function on a schedule.
Answers
B.
Configure the Lambda functions to log the tenant ID and the number of RCUs and WCUs consumed from DynamoDB for each transaction to Amazon CloudWatch Logs Deploy another Lambda function to calculate the tenant costs by using the logged capacity units and the overall DynamoDB cost from the AWS Cost Explorer API Create an Amazon EventBridge rule to invoke the calculation Lambda function on a schedule.
C.
Create a new partition key that associates DynamoDB items with individual tenants Deploy a Lambda function to populate the new column as part of each transaction Deploy another Lambda function to calculate the tenant costs by using Amazon Athena to calculate the number of tenant items from DynamoDB and the overall DynamoDB cost from the AWS CUR Create an Amazon EventBridge rule to invoke the calculation Lambda function on a schedule
Answers
C.
Create a new partition key that associates DynamoDB items with individual tenants Deploy a Lambda function to populate the new column as part of each transaction Deploy another Lambda function to calculate the tenant costs by using Amazon Athena to calculate the number of tenant items from DynamoDB and the overall DynamoDB cost from the AWS CUR Create an Amazon EventBridge rule to invoke the calculation Lambda function on a schedule
D.
Deploy a Lambda function to log the tenant ID the size of each response, and the duration of the transaction call as custom metrics to Amazon CloudWatch Logs Use CloudWatch Logs Insights to query the custom metrics for each tenant. Use AWS Pricing Calculator to obtain the overall DynamoDB costs and to calculate the tenant costs
Answers
D.
Deploy a Lambda function to log the tenant ID the size of each response, and the duration of the transaction call as custom metrics to Amazon CloudWatch Logs Use CloudWatch Logs Insights to query the custom metrics for each tenant. Use AWS Pricing Calculator to obtain the overall DynamoDB costs and to calculate the tenant costs
Suggested answer: B

Explanation:

Log Tenant ID and RCUs/WCUs:

Update the AWS Lambda functions to log the tenant ID and the number of Read Capacity Units (RCUs) and Write Capacity Units (WCUs) consumed from DynamoDB for each transaction. This data will be logged to Amazon CloudWatch Logs.

Calculate Tenant Costs:

Deploy an additional Lambda function that reads the logs from CloudWatch Logs, calculates the RCUs and WCUs used by each tenant, and then uses the AWS Cost Explorer API to retrieve the overall cost of DynamoDB usage. This function will then allocate the costs to each tenant based on their usage.

Scheduled Cost Calculation:

Create an Amazon EventBridge rule to trigger the cost calculation Lambda function at regular intervals (e.g., daily or hourly). This ensures that cost allocation is continuously updated and tenants are billed accurately based on their consumption.

This solution minimizes operational effort by automating the cost allocation process and ensuring that the company can accurately bill tenants based on their resource consumption.

Reference

AWS Cost Explorer Documentation

Amazon CloudWatch Logs Documentation

AWS Lambda Documentation

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asked 16/09/2024
Robert Andrade
47 questions
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