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Databricks - Associate Developer for Apache Spark Practice Questions & Free Practice Exam

5 free Databricks - Associate Developer for Apache Spark practice questions below, with instant explanations. The full simulator contains hundreds of exam-style questions across every topic.

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1Question 1You are here

A DataFrame with 200 partitions must be reduced to 20 partitions without a shuffle. Which operation meets that requirement?

2Question 2

Reporting analysts aggregate distinct order totals per customer via SELECT SIZE(COLLECT_SET(total)) AS distinct_totals FROM orders GROUP BY customer_id. A small subset of customers has millions of unique totals. Which operational risk arises?

3Question 3

Two upstream systems produce daily order tables. System A writes columns in order `order_id, customer_id, amount`. System B writes `customer_id, order_id, amount`. Both schemas share the same column names but differ in column order. Which combination call safely stacks the two DataFrames row-wise without corrupting `order_id` and `customer_id` values?

4Question 4

When the pipeline calls `orders.join(customers, on='customer_id')` with no how argument on Spark 3.5, which join type executes?

5Question 5

Building a DataFrame chain on a Spark Connect client mutates a plan tree locally. Nothing crosses the gRPC channel to the server until which condition occurs?

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