Nikka Instrumentation ETL Developer Interview Questions and Answers

Q1. They were asking very logical and technical questions on interview time
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Q2. They were test our skills and time punctuation
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Q1. They were discussed with some technical questions and based on knowledge
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Q1. Introduce yourself
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I am an experienced ETL Developer with a strong background in data integration and transformation.
• Over 5 years of experience in ETL development

• Proficient in using tools like Informatica, Talend, and SSIS

• Strong SQL skills for data querying and manipulation

• Experience in designing and implementing data warehouses

• Familiar with data modeling and ETL best practices
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Q2. What is SCD type2
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Q1. About project worked on
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Q2. Skill set questions based on what you are worked on
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Q1. Compansation Discussion
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Q1. Explainyour job role
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ETL Developers are responsible for designing, developing, and maintaining ETL processes to extract, transform, and load data from various sources into a data warehouse.
• Designing ETL processes to extract data from multiple sources

• Transforming data to meet business requirements

• Loading data into a data warehouse or other target systems

• Developing and maintaining ETL jobs using tools like Informatica, Talend, or SSIS
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Q2. Explain implementation of SCD 1 in IICS
Ans. 
SCD Type 1 in IICS involves overwriting existing data with new data without maintaining historical changes.
• In IICS, use the Mapping Designer to create a mapping that loads data from source to target.

• Use a Lookup transformation to check if the record already exists in the target table.

• If the record exists, update the existing record with new data using an Update Strategy transformation.

• If the record does not exist, inse...read more
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Q1. What is loads in informatica
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Loads in Informatica refer to the process of moving data from source to target in a data warehouse.
• Loads involve extracting data from source systems

• Transforming the data as needed

• Loading the data into the target data warehouse or database

• Loads can be full, incremental, or delta depending on the requirements

• Example: Loading customer data from a CRM system into a data warehouse for analysis
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Q2. Query to find duplicates in table
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Use GROUP BY and HAVING clause to find duplicates in a table.
• Use GROUP BY to group rows with same values together

• Use HAVING COUNT(*) > 1 to filter out duplicates

• Example: SELECT column_name, COUNT(*) FROM table_name GROUP BY column_name HAVING COUNT(*) > 1;
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Q1. Performance tuning of ssis packages
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Performance tuning of SSIS packages involves optimizing data flow, memory usage, and parallelism.
• Optimize data flow by using efficient data sources and destinations

• Minimize memory usage by using appropriate buffer sizes and reducing unnecessary data transformations

• Increase parallelism by using multiple threads and optimizing task execution order

• Use performance monitoring tools like SSIS logging and performance counters...read more
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Q1. Basics,ETL Process and performance tuning
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Q1. Past experience
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2 coding questions, 1 hr and Aptitude questions are also clubbed into other section.

Q1. Are flexible with location
Ans. Yes, I am flexible with location
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Q2. Are you ok if we give you testing project
Ans. 
Yes, I am open to taking on a testing project as part of my role as an ETL Developer.
• I have experience with testing tools and methodologies in my previous roles.

• I understand the importance of testing in ensuring data accuracy and quality.

• Taking on a testing project will help me improve my skills and knowledge in ETL development.
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Q3. Are you flexible with working hours
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Q1. Lookup transformation
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Q2. Joiner transformation
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Q1. What is the uses of filter stage
Ans. 
Filter stage is used in ETL processes to selectively pass or reject data based on specified criteria.
• Filter stage helps in removing unwanted data from the input dataset.

• It can be used to apply conditions like filtering out duplicate records, selecting specific columns, or excluding certain values.

• For example, a filter stage can be used to only pass records where the sales amount is greater than $1000.
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Q2. What is the uses of transfor stage
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Transform stage is used in ETL process to apply business rules, clean and enrich data before loading into target database.
• Transform stage is used to apply business rules to the data.

• It is used to clean and standardize data before loading into the target database.

• Transform stage can also be used to enrich data by combining multiple sources or adding calculated fields.

• Examples include converting data types, removing dupl
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Q3. What is the uses of sort stage
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Sort stage is used in ETL processes to sort data based on specified criteria before loading it into the target system.
• Sort stage helps in arranging data in a specific order for better analysis and reporting

• It can be used to remove duplicates from data before loading

• Sorting can be done based on multiple columns or expressions

• Example: Sorting customer data based on their purchase amount before loading into a data warehou
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Q4. How to create the prallel job
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To create a parallel job, use parallel processing techniques to divide tasks into smaller subtasks that can be executed simultaneously.
• Identify tasks that can be executed independently and in parallel

• Use parallel processing techniques such as multi-threading or distributed computing

• Implement parallel job using ETL tools like Informatica or Talend

• Monitor and optimize parallel job performance to ensure efficient executio
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Q5. Defenation of scd
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SCD stands for Slowly Changing Dimension, a technique used in data warehousing to track changes in dimension attributes over time.
• SCD is used to maintain historical data in a data warehouse

• There are different types of SCDs - Type 1, Type 2, and Type 3

• Type 1 SCD overwrites old data with new data

• Type 2 SCD creates a new record for each change and maintains history

• Type 3 SCD keeps a limited history by adding columns to tr
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