如何查看oracle当前连接数，会话数

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