查看PostgreSQL最大连接数信息

1.查看当前配置的最大连接数

-- 查看当前配置的最大连接数
show max_connections;

2.查询当前活跃连接数

-- 查询当前活跃连接数
select count(1) from pg_stat_activity;

3.查看指定IP的活跃连接信息

-- 查看指定IP的活跃连接信息
select
  * 
from
  pg_stat_activity 
where
  client_addr = '192.168.68.244';

4.按IP地址查询当前活跃的连接数

-- 按IP地址查询当前活跃的连接数
select 
  client_addr, count(1) num
from
  pg_stat_activity
group by
  client_addr
order by
  num desc;

5.按用户查询当前活跃的连接数

-- 按用户查询当前活跃的连接数
select
  usename, count(1) num
from
  pg_stat_activity 
group by
  usename 
order by
  num desc;

6.完整SQL文件信息

-- 1.查看当前配置的最大连接数
show max_connections;

-- 2.查询当前活跃连接数
select count(1) from pg_stat_activity;

-- 3.查看指定IP的活跃连接信息
select * from pg_stat_activity where client_addr = '192.168.68.244';

-- 4.按IP地址查询当前活跃的连接数
select client_addr, count(1) num from pg_stat_activity group by client_addr order by num desc;

-- 5.按用户查询当前活跃的连接数
select usename, count(1) num from pg_stat_activity group by usename order by num desc;