Gartner Data Specialist Interview Questions and Answers for Experienced

Q1. Brief Explain about SCD Type II
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Q1. Spark optimization techniques
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Spark optimization techniques involve partitioning, caching, and tuning resources for efficient data processing.
• Partitioning data to distribute workload evenly

• Caching frequently accessed data to avoid recomputation

• Tuning resources like memory allocation and parallelism

• Using broadcast variables for small lookup tables
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Q2. Data warehousing questions
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Q1. Project experience
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Developed a data pipeline to ingest, process, and analyze real-time streaming data from IoT devices.
• Designed and implemented data ingestion process using Apache Kafka

• Utilized Apache Spark for real-time data processing and analysis

• Developed data models and algorithms to extract insights from the data

• Worked with stakeholders to understand requirements and deliver actionable insights
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Q2. Challenges faced
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Some challenges faced include data quality issues, scalability issues, and keeping up with evolving technologies.
• Data quality issues such as missing values, inconsistencies, and errors in data sources.

• Scalability issues when dealing with large volumes of data and ensuring efficient processing.

• Keeping up with evolving technologies and tools in the field of data engineering.

• Collaborating with cross-functional teams and s...read more
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Spark and SQL question can expect

Focusing on the past project

Q1. Basics of power bi and sql
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Q2. What are joins and types of join
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Joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table

• FULL JOIN...read more
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Q3. How to add date table in power bi
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To add a date table in Power BI, you can create a new table with a list of dates and relationships with other tables.
• Create a new table in Power BI with a list of dates

• Add columns for day, month, year, etc. for additional analysis

• Establish relationships between the date table and other tables in the data model
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Q1. Sql scenario based question on joins
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Q2. Window function questions
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Q3. Performance tuning
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Q4. Power bi dax question
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Q1. What is stemming and lematization
Ans. 
Stemming and lemmatization are techniques used in natural language processing to reduce words to their base or root form.
• Stemming is a process of reducing words to their base form by removing suffixes.

• Lemmatization is a process of reducing words to their base form by considering the context and part of speech.

• Stemming is faster but may not always produce a valid word, while lemmatization is slower but produces valid wo...read more
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Q2. Python coding about default values in class and funtions
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Q3. Kmeans clustering evaluation
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Q4. How to measure multicollinearity
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Multicollinearity can be measured using correlation matrix, variance inflation factor (VIF), or eigenvalues.
• Calculate the correlation matrix to identify highly correlated variables.

• Use the variance inflation factor (VIF) to quantify the extent of multicollinearity.

• Check for high eigenvalues in the correlation matrix, indicating multicollinearity.

• Consider using dimensionality reduction techniques like principal componen
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Q1. How good are you with numbers
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Q1. Vlookup, pivot table, sumif, average, graphs
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Q1. Do you know the role and responsibility of this position
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Machine Learning, Metrics

Business problems were asked and analyzed the approach to solve the problem. Reading case studies would help you here

Q1. Few Statistics questions were asked. Some coding. And all about our resume in depth. Prepare your resume and Stats well.
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