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Frenquent CDP-3002 Update, Latest CDP-3002 Dumps Book

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Cloudera CDP Data Engineer - Certification Exam Sample Questions (Q314-Q319):

NEW QUESTION # 314
Which of the following is TRUE about using Explain Plans for performance tuning?

A. Explain Plans always show the actual runtime of a query
B. They are only useful for queries that involve joins
C. They can help identify operations that may become performance bottlenecks
D. They provide detailed network latency information

Answer: C

Explanation:
Explain Plans are valuable for identifying potential performance bottlenecks in a query, such as expensive joins or full table scans. They do not show actual runtime or detailed network latency and are useful for more than just queries involving joins.

NEW QUESTION # 315
What is the primary purpose of the Cost-Based Optimizer (CBO) in the context of Cloudera's Optimization Framework?

A. To decide the best execution plan based on the cost of operations
B. To distribute data evenly across the cluster
C. To minimize the amount of data processed
D. To choose the data storage format

Answer: A

Explanation:
The Cost-Based Optimizer (CBO) aims to select the most efficient execution plan for a query based on the cost associated with various operations. It considers factors like data size, data locality, and the computational cost of operations to optimize the query execution.

NEW QUESTION # 316
When leveraging Spark's DataFrame API for caching, what implicit optimization does Spark perform to enhance processing efficiency?

A. Automatic selection of the optimal storage level based on the DataFrame's size
B. Predicate pushdown and other logical optimizations before physical execution
C. Inlining of functions to reduce the overhead of JVM method calls
D. Automatic conversion of all operations to map-reduce jobs

Answer: B

Explanation:
When leveraging Spark's DataFrame API, Spark performs several implicit optimizations, including predicate pushdown, where it moves filter operations closer to the data source, thereby reducing the amount of data shuffled or moved across the network. This optimization, part of the Catalyst optimizer's logical optimization phase, enhances processing efficiency by minimizing the data processed in subsequent stages of the query.

NEW QUESTION # 317
Your Spark application on Kubernetes requires a secure connection to a database. You've stored the database password in Kubernetes Secrets. How would you typically access this secret in your PySpark application?

A. By querying the Kubernetes API
B. By using a ConfigMap
C. Through an external secrets manager
D. By reading the secret file from a volume mount

Answer: D

Explanation:
Kubernetes Secrets can be mounted as volumes and accessed within the pod. In a PySpark application, you can read these secrets from the mounted path, making it a secure way to access sensitive information like database passwords.

NEW QUESTION # 318
How does Apache NiFi support schema inference during data flow management?

A. By enforcing static schemas for all data flows
B. Through processors that automatically detect data formats and schemas
C. By manually specifying schemas for each data source
D. Utilizing external schema repositories exclusively for schema management

Answer: B

Explanation:
Apache NiFi supports schema inference through its processors that can automatically detect and apply schemas to the data as it flows through the system. This capability allows NiFi to manage data flows more dynamically, accommodating various data formats and schemas without requiring manual specification for each data source, thus enhancing flexibility in data ingestion and processing.

NEW QUESTION # 319
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