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
NomuraOptimize a slow PostgreSQL query on a large dataset by choosing better filters, joins, and indexes.
CitiOOptimoveTThoucentricOptimize a PostgreSQL transaction query that filters, aggregates, ranks, and returns top merchants efficiently on large tables.
Sprinter Health
SentiLink
AutodeskFind the second-highest distinct salary and optimize retrieval for millions of employee records using indexing.
Write and optimize a PostgreSQL query that summarizes current enrollment activity across studies and sites.
XPO
MedpaceOptimize a PostgreSQL query over millions of event rows using selective predicates, indexing, joins, and latest-row selection.
Okta
Ernst & YoungIdentify duplicate transaction groups and explain PostgreSQL indexing and execution-plan strategies for large datasets.
Honor
TeslaOptimize a PostgreSQL query over millions of recharge transactions using selective filtering, aggregation, joins, and indexing.
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