#当前的连接数
select count(*) from v$session
#并发du连接数
Select count(*) from v$session where status=‘ACTIVE’
#数据库允许的最大连接数
select value from v$parameter where name = ‘processes’
#查看不同用户的连接数
select username,count(username) from v$session where username is not null group by username;
希望能帮到你