OracleCPU使用情况查询

 

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--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 < 11)    and s.sql_address = q.address;