EPAM Systems Big Data Engineer Lead 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. 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. 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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Q1. What is work and company?
Ans. 
Nice and too good. And good online shopping company
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Q2. How to do work?
Ans. 
Just say seniors.work kaise karna hai
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Q3. Where is company and why?
Ans. 
I don't know but pata chal jayega
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Q4. How can do it?
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Q5. What to do work and why?
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Q1. Tell. me about youself
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Q2. Sql question , pyspark questions
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I am a person with unwavering an working on this company coding test

Aptitude test best' time at the highest goal hardware detected a good time

Q1. Computer knowledge of science in bigner good knowledge
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Q2. I am a person with unwavering support grow with a strong understanding of service
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Q3. All members and clans handling the highest level of service.
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Q4. I believe you have a great connection with any problems honestly working on company rules summary.
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Q5. My summary data analysis skills development consultant all I have already mentioned skills!
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Q6. My dream big and strong person in my challenges data scientist observing a very powerful mindset.
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Q1. SQL knowledge in this is very important question prepare for everything response
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Q1. My voice top voice LinkedIn social support all audience people are convenes.
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I believe you skills best coding test best' pofomanc and connect clans

1. Questions on spark basica
2. Sql coding questions
3. Java or scala basics