1、查看系统当前连接会话数

select s.value,s.sid,a.username
from 
v$sesstat S,v$statname N,v$session A
where 
n.statistic#=s.statistic# and
name='session pga memory'
and s.sid=a.sid
order by s.value;

2、等待最多的用户

SELECT s.SID, s.username, SUM (a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, v$session s
   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
GROUP BY s.SID, s.username
ORDER BY total_wait_time DESC;

---阅读剩余部分---