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.
Correct Answer:
Verified
Q84: A marketing company is using Amazon EMR
Q85: A company is planning to do a
Q86: A company wants to provide its data
Q87: A company wants to research user turnover
Q88: A company wants to enrich application logs
Q90: A retail company wants to use Amazon
Q91: An airline has been collecting metrics on
Q92: An online retail company is migrating its
Q93: A company is building a service to
Q94: A retail company leverages Amazon Athena for
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents