HCLTech ETL Developer Interview Questions and Answers

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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It's an assignment for apti, verbal

Q1. It's like an what are u mentioned in resume skills.
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Q1. Just like interaction with candidate like personal details.
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Q1. Greatest challenge faced while migrating to cloud from onpremise DB
Ans. 
The greatest challenge faced during migration to cloud from on-premise DB is ensuring data security and compliance.
• Ensuring data security during transit and at rest

• Maintaining compliance with regulations and industry standards

• Minimizing downtime and ensuring data integrity

• Optimizing performance and cost efficiency in the cloud environment
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Q1. About the ETL Process
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Q1. What are your salary expectations?
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Q1. Rank and dense rank
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Q2. Scenario based etl question
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Q1. Question on logic SCD types
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Q2. Dynamic lookup along with lookup
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Q1. What is the uses of filter stage
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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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