Professional Data Engineer

By Google · Question Mode

QuestionQ5

Preparing and using data for analysis

You monitor and optimize your team’s BigQuery instance. A particular daily report that uses a large JOIN operation is consistently slow. You want to inspect the query’s execution plan to identify potential performance bottlenecks within the JOIN as quickly as possible. What should you do?

Explanation

BigQuery’s query execution graph presents the execution plan as stages and exposes timing, resource-use, and step details. A JOIN stage can be inspected directly to identify stages that dominate execution time or resource consumption, making it the most direct way to diagnose JOIN-related bottlenecks.

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