A Company Has a Website Deployed on AWS

question 316

Multiple Choice

A company has a website deployed on AWS. The database backend is hosted on Amazon RDS for MySQL with a primary instance and five read replicas to support scaling needs. The read replicas should lag no more than 1 second behind the primary instance to support the user experience. As traffic on the website continues to increase, the replicas are falling further behind during periods of peak load, resulting in complaints from users when searches yield inconsistent results. A solutions architect needs to reduce the replication lag as much as possible, with minimal changes to the application code or operational requirements. Which solution meets these requirements?

• A) Migrate the database to Amazon Aurora MySQL. Replace the MySQL read replicas with Aurora Replicas and enable Aurora Auto Scaling
• B) Deploy an Amazon ElastiCache for Redis cluster in front of the database. Modify the website to check the cache before querying the database read endpoints.
• C) Migrate the database from Amazon RDS to MySQL running on Amazon EC2 compute instances. Choose very large compute optimized instances for all replica nodes.
• D) Migrate the database to Amazon DynamoDB. Initially provision a large number of read capacity units (RCUs) to support the required throughput with on-demand capacity scaling enabled.

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Definitions:

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A predetermined cost assigned to materials, labor, and overhead, used as a benchmark against which the actual costs are compared.

Standard Hours

The predetermined amount of time expected to complete a task or to produce a unit of output under normal conditions.

Standard Variable Overhead Rate

The predetermined rate at which variable overhead costs are expected to be incurred relative to a certain measure of activity, such as labor hours.