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Cloudera CDP Data Engineer - Certification Sample Questions:

1. You notice degraded read performance on an Iceberg table after many updates and deletes. What maintenance task should you perform to improve this?

A) Compact data files
B) Rewrite manifest files
C) Rebuild the Iceberg metadata table
D) Delete old snapshots

2. You need to design a DAG that can be easily scaled horizontally to handle increasing workload. How can you achieve this goal?

A) Leverage Airflow pools to manage resource allocation and limit concurrent task execution.
B) Implement custom logic within each task to handle parallel processing independently.
C) Utilize external scheduling tools like Cron to manage DAG execution independently of Airflow workers.
D) Increase the number of worker processes in the Airflow web server configuration.

3. While working with Spark SQL, you encounter an error message stating "Unable to resolve table 'table_name"'. What could be the potential cause of this error?

A) The table doesn't exist in the Hive metastore
B) All of the above
C) The Spark application doesn't have sufficient permissions to access the table
D) The table schema is not compatible with Spark SQL

4. In the context of Spark SQL, what does the Catalyst optimizer use to optimize queries?

A) A cost-based optimization model that considers the size of intermediate data
B) A rule-based optimization model that applies predefined rules to simplify queries
C) Machine learning algorithms to predict the fastest query execution plan

5. Which of the following is NOT a factor considered by the Optimization Framework when optimizing a query?

A) User-defined functions (UDFs) complexity
B) Data skewness
C) Network latency between nodes
D) The phase of the moon

Solutions: