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Virtual Memory

General/Othereasy0.3 min readPremium

Virtual memory: Each process gets large address space; OS maps pages to physical frames; demand paging; swap when RAM full. WHY: Isolation; working set > RAM. For DE: Excessive swap (si/so in vmstat) kills performance. SCALABILITY: Size Spark executors to avoid swap....

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Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
ZS Associates
Key Concepts Tested
spark

Why This Question Matters

This easy-level General/Other question appears frequently in data engineering interviews at companies like ZS Associates. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (spark) will help you answer variations of this question confidently.

How to Approach This

Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.

Expert Answer
56 words

Virtual memory: Each process gets large address space; OS maps pages to physical frames; demand paging; swap when RAM full. WHY: Isolation; working set > RAM. For DE: Excessive swap (si/so in vmstat) kills performance. SCALABILITY: Size Spark executors to avoid swap. COST: Swap is 1000x slower than RAM; tune JVM heap to leave OS headroom.

The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations covering performance optimization and real-world examples.

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According to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.

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