ETL Interview Questions For Freshers

What is data cleansing in ETL?

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Describe the role of metadata in ETL.

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What are some common data integration challenges in ETL?

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Explain the concept of parallel processing in ETL.

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How do you handle error records in ETL?

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What is data lineage in ETL?

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How do you ensure data security during the ETL process?

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What are some best practices for ETL performance optimization?

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Explain the concept of change data capture (CDC) in ETL.

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What is incremental loading in ETL?

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How do you handle data quality issues in ETL?

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How do you handle schema changes in ETL?

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Explain the concept of data profiling in ETL.

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What are the key components of an ETL system?

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What are some challenges faced during the ETL process?

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Describe the process of loading data in ETL.

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What is meant by data transformation in ETL?

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Explain the extraction process in ETL.

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Mention some popular ETL tools.

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What is the difference between ETL and ELT?

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What are the three main phases of ETL?

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Define ETL and explain its purpose.

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Describe the process of data deduplication in ETL.

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What are some considerations for ETL scalability?

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Explain the concept of slowly changing dimensions in ETL.

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What is dimensional modeling in ETL?

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How do you handle data quality issues in ETL?

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What is meant by data profiling in ETL?

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Describe the process of data aggregations in ETL.

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What are some strategies for data validation in ETL?

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Explain the concept of surrogate keys in ETL.

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ETL Intermediate Interview Questions

How do you handle data conversion in ETL?

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What are some strategies for managing ETL job dependencies?

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Describe the concept of surrogate key lookup in ETL.

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What are some considerations for ETL performance tuning?

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Explain the concept of change data capture (CDC) techniques in ETL.

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What is the purpose of data profiling in ETL?

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Describe the concept of slowly changing dimensions (SCD) Type 4.

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What are some techniques for handling duplicate records in ETL?

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Explain the concept of data masking in ETL.

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Describe the concept of surrogate key generation in ETL.

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What are some best practices for ETL error handling?

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How do you handle data partitioning in ETL?

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What are some data validation techniques used in ETL?

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Explain the concept of partitioning data sources in ETL.

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What is the purpose of ETL documentation?

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Describe the concept of slowly changing dimensions (SCD) Type 3.

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What are some advanced data transformation techniques in ETL?

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Explain the concept of factless fact tables in ETL.

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What is the role of surrogate keys in data warehousing?

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How do you handle data inconsistency during the ETL process?

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Explain how database indexing can improve ETL performance.

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What is the difference between full load and incremental load in ETL?

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Describe the concept of slowly changing dimensions (SCD) Type 2.

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Describe the concept of slowly changing dimensions (SCD) Type 1.

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What is the role of surrogate keys in ETL?

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Explain the concept of data partitioning in ETL.

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ETL Interview Questions For Experienced

Describe the concept of late arriving dimensions in ETL.

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What are some techniques for handling slowly changing dimensions (SCD) Type 5?

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Explain the concept of slowly changing dimensions (SCD) Type 7.

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Describe the concept of surrogate key generation using hash algorithms.

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What are some advanced techniques for handling data consistency in ETL?

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Explain the concept of slowly changing dimensions (SCD) Type 6.

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Describe the concept of real-time ETL processing.

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What are some advanced techniques for data masking in ETL?

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What are some advanced techniques for handling ETL job dependencies?

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Explain the concept of surrogate key generation using database triggers.

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Describe the concept of distributed ETL processing.

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What are some issues and challenges faced in handling slowly changing dimensions (SCD) Type 8?

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Explain the concept of surrogate key generation using rule-based algorithms.

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Describe the concept of dynamic ETL processing.

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What are some advanced techniques for data validation in ETL?

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Explain the concept of surrogate key generation using database sequences.

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Describe the concept of in-memory ETL processing.

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What are some techniques for handling slowly changing dimensions (SCD) Type 7?

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Explain the concept of surrogate key generation using surrogate key mapping tables.

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Describe the concept of slowly changing dimensions (SCD) Type 9.

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What are some advanced techniques for handling data partitioning in ETL?

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Explain the concept of surrogate key generation using natural keys.

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What are some techniques for handling slowly changing dimensions (SCD) Type 6?

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Describe the concept of slowly changing dimensions (SCD) Type 8.

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Explain the concept of surrogate key generation using real-time feeds.

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