EPAM Systems Data Engineer 2 Interview Questions and Answers

Q1. How do you utilize the enhanced optimization option in AWS Glue?
Ans. 
Enhanced optimization in AWS Glue improves job performance by automatically adjusting resources based on workload
• Enhanced optimization in AWS Glue automatically adjusts resources like DPUs based on workload

• It helps improve job performance by optimizing resource allocation

• Users can enable enhanced optimization in AWS Glue job settings
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Q2. What are the best practices for optimizing querying in Amazon Redshift?
Ans. 
Optimizing querying in Amazon Redshift involves proper table design, distribution keys, sort keys, and query optimization techniques.
• Use appropriate distribution keys to evenly distribute data across nodes for parallel processing.

• Utilize sort keys to physically order data on disk, reducing the need for sorting during queries.

• Avoid using SELECT * and instead specify only the columns needed to reduce data transfer.

• Use AN...read more
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Q1. Adf,etl,python,adb
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Related to Statistics

Related Excel and SQl

Q1. What is your salary expectation
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Q1. What is scd type 2?
Ans. 
SCD type 2 is a method used in data warehousing to track historical changes by creating a new record for each change.
• SCD type 2 stands for Slowly Changing Dimension type 2

• It involves creating a new record in the dimension table whenever there is a change in the data

• The old record is marked as inactive and the new record is marked as current

• It allows for historical tracking of changes in data over time

• Example: If a cust...read more
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Q2. Pyspark question read CSV from folder and add column in each csv file and write it to different location.
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Q1. How you will find that some user SQL running slow without discussing with user?
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Q2. How you will patch specific db components to reduce downtime?
Ans. 
To patch specific db components to reduce downtime, follow these steps:
• Identify the specific components that need to be patched

• Plan the patching process during a scheduled maintenance window

• Backup the database before applying patches

• Apply patches to the specific components one by one

• Test the patched components to ensure they are functioning correctly

• Monitor the database for any issues post-patching
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Q1. Why you have so many hopping in your resume?
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Q2. How you will rate yourself as an dba?
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Q1. Data engineer roles and resposibilities
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Q1. Tell about experience
Ans. 
I have over 5 years of experience in data engineering, working with large datasets and implementing data pipelines.
• Developed and maintained ETL processes to extract, transform, and load data from various sources

• Optimized database performance and implemented data quality checks

• Worked with cross-functional teams to design and implement data solutions

• Utilized tools such as Apache Spark, Hadoop, and SQL for data processing

• ...read more
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Q2. What would you do when you are given a new task to do
Ans. 
I would start by understanding the requirements, breaking down the task into smaller steps, researching if needed, and then creating a plan to execute the task efficiently.
• Understand the requirements of the task

• Break down the task into smaller steps

• Research if needed to gather necessary information

• Create a plan to execute the task efficiently

• Communicate with stakeholders for clarification or updates

• Regularly track prog
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Multiple coding questions

Multiple case studies

Q1. Why you want to leave the last company?
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Q2. Where do you see yourself in 5 years
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