"PostgreSQL Autovacuum 调优指南"

PostgreSQL Autovacuum 调优指南关键参数（`postgresql.conf`）autovacuum = on autovacuum_naptime = 10s autovacuum_vacuum_threshold = 50 autovacuum_vacuum_scale_factor = 0.1 autovacuum_analyze_threshold = 50 autovacuum_analyze_scale_factor = 0.05 vacuum_cost_limit = 200 手动验证VACUUM (VERBOSE, ANALYZE) public.items; SELECT relname, n_dead_tup FROM pg_stat_all_tables WHERE relname = 'items'; 观测与维护关注 `pg_stat_user_tables` 的死元组与自动清理触发根据写入速率与表大小调整 scale_factor 与 threshold总结合理的 autovacuum 策略能避免表膨胀并保持查询计划准确。