Amazon Exam DAS-C01 Topic 5 Question 31 Discussion

Actual exam question for Amazon's DAS-C01 exam

Question #: 31
Topic #: 5

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?

AThe dashboards are suffering from inefficient SQL queries.

BThe cluster is undersized for the queries being run by the dashboards.

CThe nightly data refreshes are causing a lingering transaction that cannot be automatically closed by Amazon Redshift due to ongoing user workloads.

DThe 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.

Show Suggested Answer

Suggested Answer: D

https://github.com/awsdocs/amazon-redshift-developer-guide/issues/21

by Myra at May 08, 2022, 01:23 PM

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