怎樣查看oracle當前的連接數呢？只需要用下面的SQL語句查詢一下就可以了。
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$session   #連接數

Select count(*) from v$session where status='ACTIVE'　#并發連接數

show parameter processes   #最大連接

alter system set processes = value scope = spfile;重啟數據庫   #修改連接

/home/oracle9i/app/oracle9i/dbs/init.ora

/home/oracle9i/app/oracle9i/dbs/spfilexxx.ora ## open_cursor