2、查看参数 show xxx;或select current_setting('xxx'); 3、修改参数 修改当前session的参数配置: set maintenance_work_mem to '128M';或select set_config('maintenance_work_mem','128M',false);ALTER SYSTEM动态修改全局参数: ALTER SYSTEM
current_setting(setting_nametext[,missing_okboolean] ) →text 返回设置的setting_name的当前值。 如果没有这样的设置,current_setting将抛出一个错误,除非missing_ok被提供并且为true。 这个函数对应于SQL命令SHOW。 current_setting('datestyle')→ISO, MDY set_config(setting_nametext,new_valuetext,is_localb...
SELECTname , settingFROMpg_settingswherename='XXX';SELECTcurrent_setting(name) ;show参数名|showall 4.使配置生效
current_setting --- ISO, YMD (1 row) set_config将参数setting_name设置为new_value。如果is_local设置为true,那么新数值将只应用于当前事务。如果你希望新的数值应用于当前会话,那么应该使用false。它等效于SQL命令SET。比如: MyTest=# SELECT set_config('log_statement_stats','off', false); set_confi...
current_setting('autovacuum_freeze_max_age'):: int - age(datfrozenxid) AS remaining_aggressive_vacuum FROM pg_database WHERE datname NOT IN ( 'cloudsqladmin', 'template0', 'template1' ); 同时也可以监控当前那些表正在进行autovacuum
select current_setting('server_version_num'); 注意:select current_setting(‘server_version_num’);返回类型为text,如果需要可以转换为interger 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select current_setting('server_version_num')::integer; 2.创建数据库 代码语言:javascript 代码运行次数:0 运...
/* child node cost */ + 0.1 * current_setting('cpu_operator_cost')::real * reltuples * 0.01027850 ) FROM pg_class WHERE relname = 'idx_a_t1' ), ( SELECT round( cost_per_page * pages_fetched + current_setting('cpu_tuple_cost')::real * tuples_fetched...
xiaoming=# select reltuples, current_setting('cpu_tuple_cost') as cpu_tuple_cost, reltuples * current_setting('cpu_tuple_cost')::real AS cpu_cost from pg_class where relname='t1'; reltuples | cpu_tuple_cost | cpu_cost ---+---+--- 2e+06 | 0.01 | 20000 (1 row) total_cost...
(current_setting('autovacuum_analyze_threshold')::NUMERIC(12,4))+(current_setting('autovacuum_analyze_scale_factor')::NUMERIC(12,4))*reltuples AS 自动分析阈值, (current_setting('autovacuum_vacuum_threshold')::NUMERIC(12,4))+(current_setting('autovacuum_vacuum_scale_factor')::NUMERIC(12,4)...
SELECT round((relpages * current_setting('seq_page_cost')::real +reltuples / 2.4 * current_setting('cpu_tuple_cost')::real)::numeric, 2) FROM pg_class WHERE relname = 'bookings'; 1. 3. 聚集部分 WITH t(startup_cost) AS (SELECT 22243.29 + round((reltuples / 2.4 * current_sett...