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查看Oracle CPU情况

WBOY
WBOYasal
2016-06-07 16:55:581092semak imbas

--发现那些SQL运行了大量的PARSE select sql_text, parse_calls, executions from v$sqlarea order by parse_calls desc;

 --发现那些SQL运行了大量的PARSE

  select sql_text, parse_calls, executions from v$sqlarea order by parse_calls desc;

  --SYS的总的PARSE情况

  select name, value from v$sysstat where name like 'parse count%';

  --CPU空间及繁忙情况

  select * from v$osstat;

  --查看每个Session的CPU利用情况:

  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;

  --比较一下哪个session的CPU使用时间最多,,然后查看该Session的具体情况:

  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;

  ---占用CPU最高的10个Session及其SQL语句

  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

  )

  and s.sql_address=q.address;

linux

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