oracle當前的連接數

怎樣查看oracle當前的連接數呢？

select * from v$session where username is not null
select username,count(username) from v$session where username is not null group by username #查看不同用戶的連接數
select count(*) from v$process
select count(*) from v$session #連接數
Select count(*) from v$session where status='ACTIVE'　#併發連接數
show parameter processes #最大連接
alter system set processes = value scope = spfile;重啓數據庫 #修改連接


ulimit – u 1000
//Maximum number of PROCESSES allowed per user的問題

下面有一個文件叫 sqlnet.ora
如果裏面的 tcp.validnode_checking 是tcp.validnode_checking = yes