性能测试记录

一、postgresql的链接数使用状况查询

select max_conn,used,res_for_super,max_conn-used-res_for_super res_for_normal from 
  (select count(*) used from pg_stat_activity) t1,
  (select setting::int res_for_super from pg_settings where name=$$superuser_reserved_connections$$) t2,
  (select setting::int max_conn from pg_settings where name=$$max_connections$$) t3