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Cloudera CDP Data Engineer - Certification Sample Questions:

1. Which technique in the Optimization Framework is primarily used to improve query performance by reducing the number of rows to be scanned in a table?

A) Indexing
B) Data replication
C) Predicate pushdown
D) Data compaction

2. What is the impact of caching intermediate data in Spark on iterative algorithms' performance?

A) It has no impact on performance but increases storage requirements.
B) It significantly increases the execution time of each iteration.
C) It improves performance by reducing the need to recompute data in each iteration.
D) It decreases fault tolerance by storing data in volatile storage.

3. Your Airflow DAG encounters an error during the data transformation stage. What information can you access in the Airflow UI to troubleshoot the issue?

A) The Airflow web server logs might contain relevant information about the error.
B) You need to manually inspect the code for potential issues.
C) The DAG run details page displays the task logs, providing insights into the specific error encountered.
D) All of the above

4. You're tasked with creating a DAG in Airflow that orchestrates a complex data processing workflow. What are some key considerations for designing an effective DAG?

A) Use a single DAG for the entire workflow, regardless of its complexity.
B) Implement extensive logging within each task for detailed information, even if it slows down execution.
C) Configure the DAG to run continuously without any specific scheduling or triggering mechanism.
D) Break down the workflow into smaller, modular tasks with clear dependencies.

5. In an Airflow DAG, you have tasks A, B, C, and D. Task A must complete before B and C can start, but B and C can run in parallel. Task D should only run once both B and C have completed. How do you set up these dependencies?

A) [A ]] B, A]] C] and [B, C] ]] D
B) A.set_downstream([B, C]) and set_upstream([B, C])
C) A]] B ]] C]] D
D) A]] B, C]] D

Solutions: