What pg_stat_statements Actually Tells You About Your Queries

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Learn how to use pg_stat_statements to find PostgreSQL queries that consume the most execution and planning time, even when they run in milliseconds.
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Your slowest PostgreSQL query isn't necessarily your most expensive. This guide uses pg_stat_statements to analyze real query fingerprints by total execution time, call frequency, buffer usage, and planning time. It shows how a 0.2ms query can consume more planning time than every other statement combined, how partition pruning creates hidden costs, and where pg_stat_statements' blind spots begin.