--發現那些SQL運行了大量的PARSE
select sql_text, parse_calls, executions from v$sqlarea order by parse_calls desc;
--SYS的總的PARSE情況
select name, value from v$sysstat where name like 'parse count%';
--CPU空間及繁忙情況
select * from v$osstat;
--查看每個Session的CPU利用情況：
select ss.sid,se.command,ss.value CPU ,se.username,se.program
from v$sesstat ss, v$session se
where ss.statistic# in
(select statistic#
from v$statname
where name = 'CPU used by this session')
and se.sid=ss.sid
and ss.sid>6 order by CPU desc;
--比較一下哪個session的CPU使用時間最多，然後查看該Session的具體情況：
select s.sid, s.event, s.MACHINE,s.OSUSER,s.wait_time, w.seq#, q.sql_text
from v$session_wait w, v$session s, v$process p, v$sqlarea q
where s.paddr=p.addr and
s.sid=&p and
s.sql_address=q.address;
---佔用CPU最高的10個Session及其SQL語句
select s.sid,w.wait_time,w.seconds_in_wait,w.state,w.wait_time_micro,w.time_remaining_micro,w.time_since_last_wait_micro,p.USERNAME,
status,server,schemaname,osuser,machine,p.terminal,p.program,logon_time,w.event,w.wait_class,tracefile,sql_text,last_active_time
from v$session_wait w, v$session s, v$process p, v$sqlarea q
where s.paddr=p.addr and
s.sid
in
( select sid from
(
select ss.sid
from v$sesstat ss, v$session se
where ss.statistic# in
(
select statistic# from v$statname
where name = 'CPU used by this session'
)
and se.sid=ss.sid and ss.sid>6 order by ss.value desc
)where rownum<11
)
and s.sql_address=q.address;
