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Data Engineer Technical Interview Questions

Review this list of 5 technical data engineer interview questions and answers verified by hiring managers and candidates.
  • Amazon logoAsked at Amazon 

    What is the difference between OLTP and OLAP?

    1 answer

    "OLTP (Online Transaction Processing) and OLAP (Online Analytical Processing) are two types of data processing systems, each designed for specific purposes in the context of database and data warehouse environments. OLTP (Online Transaction Processing):Purpose: OLTP systems are designed to manage and handle high volumes of transactions, such as inserting, updating, and deleting data. These systems are typically used in day-to-day business operations. Characteristics: Handles small, si"

    Nikunj V. - "OLTP (Online Transaction Processing) and OLAP (Online Analytical Processing) are two types of data processing systems, each designed for specific purposes in the context of database and data warehouse environments. OLTP (Online Transaction Processing):Purpose: OLTP systems are designed to manage and handle high volumes of transactions, such as inserting, updating, and deleting data. These systems are typically used in day-to-day business operations. Characteristics: Handles small, si"See full answer

    Data Engineer
    Technical
    +1 more

  • What types of indexes are in a relational database?

    1 answer

    "i said there is hashed, clustered, non-clustered"

    Erjan G. - "i said there is hashed, clustered, non-clustered"See full answer

    Data Engineer
    Technical

  • Explain the differences between Parquet and Avro.

    1 answer

    "i did not know ,but the answer is parquet is column-oriented, avro is row-oriented"

    Erjan G. - "i did not know ,but the answer is parquet is column-oriented, avro is row-oriented"See full answer

    Data Engineer
    Technical

  • Explain the differences between wide and narrow dependencies in Apache Spark.

    1 answer

    "i failed to answer, did not know"

    Erjan G. - "i failed to answer, did not know"See full answer

    Data Engineer
    Technical

  • What data tools have you worked with, and what specific projects did you use those tools for?

    1 answer

    "I have worked with tools such as Hadoop, Oracle, DBeaver, and Databricks. I have used these tools at work when dealing with large datasets, data cleaning, data security, and creating models"

    Aneesh D. - "I have worked with tools such as Hadoop, Oracle, DBeaver, and Databricks. I have used these tools at work when dealing with large datasets, data cleaning, data security, and creating models"See full answer

    Data Engineer
    Technical

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