Top 50 database optimization Interview Questions
The most frequently asked database optimization questions across all roles and companies, ranked by real interview frequency. Updated daily.
Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.
Biz2Credit
AmeripriseEEltro Cyberchrome PrivateOptimize a PostgreSQL reporting query by reducing intermediate rows, using appropriate joins, and calculating monthly performance efficiently.
The Cigna Group
ElemicaOptimize a PostgreSQL billing query using selective filtering, pre-aggregation, indexes, and regional ranking.
QuantumBlackDDell Tech Laboratories
ConfluentTask A reporting query at a commerce platform summarizes recent orders for active customers, but the production version is slow. Write a PostgreSQL query t...
Optimize a PostgreSQL reporting query by reducing scanned rows, preserving unmatched records, and selecting the latest related review efficiently.
Tata Consultancy Services (North America)PPriority Technology Holdings, LLC
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Optimize a customer order aggregation query while preserving date, status, join, and spending filters.
Lam Research
Publicis Sapient
Atlanticus ServicesOptimize a slow PostgreSQL query on a large dataset by choosing better filters, joins, and indexes.
CitiOOptimoveTThoucentricDemonstrate a PostgreSQL approach for optimizing a filtered aggregation query over related tables.
Boeing Intelligence & AnalyticsRRM Design & Engineering
Waymo