A Company Has an Application That Is Using a MySQL-Compatible

question 376

Multiple Choice

A company has an application that is using a MySQL-compatible Amazon Aurora Multi-AZ DB cluster as the database. A cross-Region read replica has been created for disaster recovery purposes. A DevOps engineer wants to automate the promotion of the replica so it becomes the primary database instance in the event of a failure. Which solution will accomplish this?

• A) Configure a latency-based Amazon Route 53 CNAME with health checks so it points to both the primary and replica endpoints. Subscribe an Amazon SNS topic to Amazon RDS failure notifications from AWS CloudTrail and use that topic to trigger an AWS Lambda function that will promote the replica instance as the master.
• B) Create an Aurora custom endpoint to point to the primary database instance. Configure the application to use this endpoint. Configure AWS CloudTrail to run an AWS Lambda function to promote the replica instance and modify the custom endpoint to point to the newly promoted instance.
• C) Create an AWS Lambda function to modify the application's AWS Cloud Formation template to promote the replica, apply the template to update the stack, and point the application to the newly promoted instance. Create an Amazon CloudWatch alarm to trigger this Lambda function after the failure event occurs.
• D) Store the Aurora endpoint in AWS Systems Manager Parameter Store. Create an Amazon EventBridge (Amazon CloudWatch Events) event that defects the database failure and runs an AWS Lambda function to promote the replica instance and update the endpoint URL stored in AWS Systems Manager Parameter Store. Code the application to reload the endpoint from Parameter Store if a database connection fails.

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Definitions:

Duration

A measure of the sensitivity of the price of a bond or other debt instrument to changes in interest rates, often used to assess interest rate risk.

Coupon Rate

The annual interest rate paid on a bond's face value to its holders, expressed as a percentage of the face value.

Duration

Measures the sensitivity of a bond's price to changes in interest rates, calculated as a weighted average of the times until the bond's cash flows are received.

Yield To Maturity

The total return anticipated on a bond if the bond is held until its maturity date, including all interest payments and the repayment of principal.