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Top 50 data storage Interview Questions

The most frequently asked data storage questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~7htotal time
53companies covered
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1
PipelinesStart here. 38 questions · ~317 min
Partitioning and Indexing StrategyHard
Recently asked

Design a practical partitioning and indexing strategy for improving large dataset loading and query performance.

InfrastructureToolsindexingStraiveEXL ServiceBrex
Managing Data LakesHard
Recently asked

Explain your experience designing, operating, governing, and improving reliable data lake pipelines.

Data QualityInfrastructureETLAmazon Web ServicesIIBM IndiaSalesforce
Data Retention PoliciesHard
Recently asked

Explain how to define, enforce, monitor, and safely change data retention policies across engineering pipelines and storage layers.

InfrastructureGovernancedata pipelinesAutodeskDDatafortuneWalmart
Data Lake Security ImplementationHard

Explain how to protect data, identities, pipelines, and access within a secure data lake architecture.

InfrastructureGovernancedata architectureDDatafortuneExperis
Optimize Storage Layout and FilesHard

Optimize partitioning, compaction, file sizing, and table maintenance for reliable analytics performance and cost efficiency.

ETL optimizationInfrastructuredata warehouseDDentsu Global ServicesNVIDIA
Secure K8s for GPU WorkloadsHard
Recently asked

Design a secure NVIDIA Kubernetes cluster for GPU workloads with enforced network isolation, GPU scheduling, and reliable persistent storage.

Infrastructurekubernetes securityDependenciesNVIDIA
Database Trade-offs for LoggingHard

Evaluate database trade-offs for a Datadog-integrated logging architecture across retention, search, cost, reliability, and compliance.

Infrastructuredata pipelinesdatabaseDatadog
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2
System Design6 questions · ~50 min
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More topics6 questions · ~50 min
Longest Subarray with At Most K Distinct IntegersMedium
Practice

Demonstrate an end-to-end solution process using a sliding window to find the longest valid array segment.

leetcodeArraysAlgorithmsRoblox
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Choosing a Data Modeling TechniqueMedium
Practice
Practice drill

Use normalized revenue data to produce an analytics-ready monthly revenue view and justify the modeling choice.

Decision Makingfact tablesnormalizationFactored
Monthly Sales Trends by CategoryMedium
Practice
Recently asked
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
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