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--发现那些SQL运行了大量的PARSEselect 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; |
