Data Warehouse Interview Questions

17 real Data Warehouse questions asked in live technical interviews — each with a model answer. Updated weekly.

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You're tasked with building a real‑time data pipeline using Apache Kafka and Apache Spark. The pipeline needs to process 1 million events per second and write the results to a data warehouse. How would you design the pipeline and what technologies would you use?🔴 Hard · System Design · Asked 2×You're tasked with designing a distributed data processing system using Apache Spark and Apache Kafka. The system needs to process 10 million events per second and write the results to a data warehouse. How would you design the system and what technologies would you use?🔴 Hard · System Design · Asked 2×Is it possible to store semi-structured or unstructured data in Amazon Redshift?🟡 Medium · Conceptual · Asked 1×What is the difference between a data warehouse, Delta Lake, a data lake, and a data lakehouse?🟡 Medium · Conceptual · Asked 1×What are the different types of dimensions that can be used in a data warehouse?🟡 Medium · Conceptual · Asked 1×What is the goal layer when building dimensions? Suppose we have an e-commerce company that sells products on Flipkart.🟡 Medium · Conceptual · Asked 1×Do you have experience with Trino? Can you test Trino?🟡 Medium · Conceptual · Asked 1×Can you explain the difference between a data lakehouse and a data warehouse?🟡 Medium · Conceptual · Asked 1×How are data warehouses different from databases? For example, DynamoDB is a database, Snowflake is a data warehouse. What is the main purpose of a data warehouse?🟡 Medium · Conceptual · Asked 1×How would you design a real‑time data pipeline that ingests information from millions of users into a data warehouse using Kafka and a fan‑out architecture?🔴 Hard · System Design · Asked 1×Have you used Snowflake before?🟢 Easy · Conceptual · Asked 1×In Amazon Redshift, if a table is used for both delivery and updates, do you need to run VACUUM to maintain performance?🟡 Medium · Conceptual · Asked 1×Explain how you would design an end-to-end data pipeline using AWS Glue, from S3 to a data warehouse, including staging, transformation, and final loading.🔴 Hard · System Design · Asked 1×Suppose 100 GB of files arrive in an S3 bucket every day and need to be processed and loaded into a data warehouse. Which AWS services would you use and why? Consider factors such as flexibility, cost, scalability, and error recovery.🔴 Hard · System Design · Asked 1×In a data warehouse project, can you explain an example of a slowly changing dimension?🟡 Medium · Conceptual · Asked 1×If we have a huge table in Amazon Redshift, what options would you consider to optimize its performance?🟡 Medium · Conceptual · Asked 1×What is the major difference between a data lake and a data warehouse?🟢 Easy · Conceptual · Asked 1×

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