Databricks Certified Data Engineer - Professional
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In the context of optimizing a Spark application's performance using the Spark UI, consider the following scenario: A data engineer notices that certain SQL queries are taking longer than expected to execute. The engineer decides to investigate by examining the 'SQL' tab in the Spark UI. Which of the following best describes the insights that can be gained from the 'SQL' tab and how these insights can be applied to improve the application's performance? Choose the best option.
Explanation:
The correct answer is C because the 'SQL' tab in the Spark UI specifically provides the physical and logical execution plans of SQL queries. These plans are crucial for understanding how a query is executed and identifying potential bottlenecks or inefficiencies. By analyzing these plans, a data engineer can apply targeted optimizations, such as rewriting queries or adjusting join strategies, to improve performance. Options A, B, and D describe functionalities that are either not provided by the 'SQL' tab or are not directly related to optimizing query execution based on execution plans.