"PostgreSQL pg_stat_statements 查询分析与优化"

PostgreSQL pg_stat_statements 查询分析与优化启用（postgresql.conf）shared_preload_libraries = 'pg_stat_statements' pg_stat_statements.max = 5000 pg_stat_statements.track = all 查询统计SELECT query, calls, total_time, mean_time FROM pg_stat_statements ORDER BY total_time DESC LIMIT 20; 优化路径针对高 `calls` 与高 `mean_time` 的语句建立索引或改写结合 `EXPLAIN (ANALYZE, BUFFERS)` 验证计划与 IO总结pg_stat_statements 能有效定位性能热点，为持续优化提供依据。