Top 20 Most Expensive PostgreSQL Queries with pg_stat_statements
Ranks queries by total time, call count and mean time. Tells you which query to tune first.
-- Gerekli: CREATE EXTENSION pg_stat_statements; (shared_preload_libraries)
SELECT round(total_exec_time::numeric, 0) AS total_ms,
calls,
round(mean_exec_time::numeric, 2) AS mean_ms,
round((100 * total_exec_time / sum(total_exec_time) OVER ())::numeric, 2) AS pct_total,
rows,
left(query, 150) AS query
FROM pg_stat_statements
ORDER BY total_exec_time DESC
LIMIT 20;Verify in a staging environment prior to running in production. This is a read-only diagnostic query; it does not acquire exclusive locks.
- This script is designed for read-only diagnostics; it does not alter schema or modify data directly.
- Prior to executing on production systems under high load, verify the target database version (Min. Version: 13 (eski sürümde `total_time`, `mean_time`)).
- Exercise caution with mutating actions (e.g., terminating sessions or dropping indexes) referenced in the notes section.
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