Google Cloud Professional Data Engineer PDE — Topic 1 Question 53

Question

You are using Google BigQuery as your data warehouse. Your users report that the following simple query is running very slowly, no matter when they run the query: SELECT country, state, city FROM [myproject:mydataset.mytable] GROUP BY country You check the query plan for the query and see the following output in the Read section of Stage:1: What is the most likely cause of the delay for this query?

Accepted Answer

Correct answer: D. The correct answer is D. Option D: Most rows in the [myproject:mydataset.mytable] table have the same value in the country column, causing data skew.

Google Cloud Professional Data Engineer PDE — Question 53