A Large Retailer Has Successfully Migrated to an Amazon S3

question 54

Multiple Choice

A large retailer has successfully migrated to an Amazon S3 data lake architecture. The company's marketing team is using Amazon Redshift and Amazon QuickSight to analyze data, and derive and visualize insights. To ensure the marketing team has the most up-to-date actionable information, a data analyst implements nightly refreshes of Amazon Redshift using terabytes of updates from the previous day. After the first nightly refresh, users report that half of the most popular dashboards that had been running correctly before the refresh are now running much slower. Amazon CloudWatch does not show any alerts. What is the MOST likely cause for the performance degradation?

• A) The dashboards are suffering from inefficient SQL queries.
• B) The cluster is undersized for the queries being run by the dashboards.
• C) The nightly data refreshes are causing a lingering transaction that cannot be automatically closed by Amazon Redshift due to ongoing user workloads.
• D) The nightly data refreshes left the dashboard tables in need of a vacuum operation that could not be automatically performed by Amazon Redshift due to ongoing user workloads.

---

Definitions:

High Performance

Achieving significantly better outcomes or efficiency than what is considered standard.

Noble Cause

A goal or principle considered to be morally righteous and worthy of pursuit.

Inspire Workers

To motivate and uplift employees or team members, encouraging them to achieve their best performance and reach their full potential.

Barrier Buster

Individuals or policies that identify and remove obstacles to streamline processes or facilitate easier access to resources or information.