Top 50 Performance Tuning Interview Questions
The most frequently asked Performance Tuning questions across all roles and companies, ranked by real interview frequency. Updated daily.
Optimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.
Capgemini
NomuraUse PostgreSQL diagnostic snapshots to identify lock blockers and quantify query throughput degradation.
Together AiOptimize a PostgreSQL aggregation query over large order data using selective filtering, indexes, and execution-plan analysis.
ToyotaOptimize a PostgreSQL aggregation over large sales tables by filtering early, reducing rows, and ranking top models by region.
ToyotaOptimize a PostgreSQL transaction query using selective filtering, aggregation, joins, and execution-plan reasoning.
SoFiAnalyze slow query workloads with filtered aggregation and an owner lookup.
WaymoOptimize challenge-performance analytics for a large HackerRank dataset while preserving results and improving aggregation efficiency.
Explain how to tune slow PostgreSQL queries on multi-million-row tables using indexes, execution plans, joins, and partitioning.
EloeloDDicetek
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