Question

如何查看oracle当前连接数，会话数

Answer 1

查看session：
select * from v$session where username is not null
select username,count(username) from v$session where username is not null group by username
当前连接数：
select count(*) from v$process
查看连接数参数的设置情况
select value from v$parameter where name = 'processes'

Select count(*) from v$session where status='ACTIVE'　#并发连接数

Answer 2

select count(*) TOTAL_SESSION from v$session;