Performance Optimization Interview Questions

14 real Performance Optimization questions asked in live technical interviews — each with a model answer. Updated weekly.

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These Performance Optimization interview questions were captured from real interviews by candidates using Assisting AI. Each links to a full model answer. For real-time help during your own interview, get Assisting AI from ₹500/day.

Have you optimized Spark jobs for performance?🟡 Medium · Conceptual · Asked 56×Have you optimized queries?🟡 Medium · Conceptual · Asked 47×How do you optimize performance in Snowflake?🟡 Medium · Conceptual · Asked 25×How do you differentiate between caching and partitioning strategies in Databricks, and how do you decide which feature to use for performance optimization?🟡 Medium · Conceptual · Asked 1×I noticed you didn't share your experience in developing ETL pipelines with Databricks and PySpark. Could you walk me through a recent example where you optimized pipeline performance or handled a specific challenge?🟡 Medium · Conceptual · Asked 1×How do you optimize Spark jobs?🟡 Medium · Conceptual · Asked 1×What specific techniques do you use while optimizing a price pump job?🟡 Medium · Conceptual · Asked 1×Suppose you're given a dataset with 100 million rows and you need to perform a complex join operation between two tables. How would you optimize the join operation for better performance?🟡 Medium · Conceptual · Asked 1×Suppose you're given a dataset with 100 million rows and you need to perform a complex query that involves aggregating data from multiple tables. How would you optimize the query for better performance using Apache Spark's advanced features like GraphX and MLlib?🔴 Hard · Conceptual · Asked 1×Are you using AWS Step Functions? If you ran into performance issues, how would you optimize?🟡 Medium · Conceptual · Asked 1×We currently use a copy‑on‑write strategy, but cluster calls are increasing because full data files are rewritten for a single row update. How would you address this?🟡 Medium · Conceptual · Asked 1×Mention how using materialized views optimized a job by 70%.🟡 Medium · Conceptual · Asked 1×Once I have found that the code is taking a long time, what strategies would I use to reduce the runtime?🟡 Medium · Conceptual · Asked 1×How do you optimize Apache Spark jobs?🟡 Medium · Conceptual · Asked 1×

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