Dell Data Scientist and Data Engineering Optimize 2023 (D-DS-OP-23) Free Practice Test

Question 1

In order for a table to be normalized in 4NF, what two conditions must be met?

A. Table is in 3NF
No dependencies exist

B. Table is in 3NF
No multi-valued dependencies exist

C. Table is in BCNF
No multi-valued dependencies exist

D. Table is in BCNF
Multi-valued depen

Correct Answer: C

Question 2

In an Apache Spark Streaming environment, what acts as an entry point to the streaming system and provides methods to create and transform DStreams?

A. StreamingContext

B. Spark Core

C. Receiver

D. Streams API

Correct Answer: A

Question 3

What is a significant advantage of using a columnar store NoSQL database for analytical workloads?

A. Efficient storage of hierarchical data

B. High-speed transaction processing

C. Real-time data synchronization

D. Optimized query performance on large datasets

Correct Answer: D

Question 4

What skill is essential for a data engineer to efficiently transform and clean raw data into usable formats?

A. Data warehousing

B. ETL (Extract, Transform, Load) processes

C. Machine learning

D. Data visualization

Correct Answer: B

Question 5

Which characteristic of a relational database ensures that each row in a table is uniquely identifiable?

A. Foreign key

B. Primary key

C. Joins

D. Indexing

Correct Answer: B

Question 6

What is the primary use of sets in Python?

A. Storing ordered sequences

B. Storing key-value pairs

C. Storing hierarchical data

D. Storing unique elements

Correct Answer: D

Question 7

What is the purpose of sensor operators in Apache Airflow?

A. Use triggers to report each successive retry

B. Use a poke method to monitor external processes

C. Perform validation checks in parallel

D. Move data sequentially from one system to another

Correct Answer: B

Question 8

In Python, which type of operator is often used in conditional statements to perform Boolean operations?

A. Arithmetic

B. Assignment

C. Bitwise

D. Logical

Correct Answer: D

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EMC Dell Data Scientist and Data Engineering Optimize 2023 (D-DS-OP-23) Free Practice Test