--查找最近1分钟内最消耗cpu的sql

SELECT sql_id,count(*), round(count(*) / sum(count(*)) over(),2) pctload FROM V$ACTIVE_SESSION_HISTORY WHERE sample_time > sysdate-1/(24*60) AND session_type <>'BACKGROUND' AND session_state ='ON CPU' GROUP BY sql_id ORDER BY count(*) desc;
--查找最近1分钟内最消耗io的sql SELECT ash.sql_id,count(*) FROM V$ACTIVE_SESSION_HISTORY ASH,V$EVENT_NAME EVT WHERE ash.sample_time >sysdate-1/(24*60) AND ash.session_state ='WAITING' AND ash.event_id = evt.event_id AND evt.wait_class ='User I/O' GROUP BY ash.sql_id ORDER BY count(*) desc;
--查找最近1分钟内最消耗资源的sql SELECT ash.sql_id, sum(decode(ash.session_state,'ON CPU',1,0)) "CPU", sum(decode(ash.session_state,'WAITING',1,0)), sum(decode(ash.session_state,'WAITING',decode(en.wait_class,'USER I/O',1,0),0)) "WAIT", sum(decode(ash.session_state,'WAITING',decode(en.wait_class,'USER I/O',1,0),0)) "IO", sum(decode(ash.session_state,'ON CPU',1,1)) "TOTAL" FROM V$ACTIVE_SESSION_HISTORY ASH,V$EVENT_NAME EN WHERE SQL_ID is not null and en.event#=ash.event# and ash.sample_time > sysdate -1/(24*60) GROUP BY ash.sql_id ORDER BY sum(decode(ash.session_state,'ON CPU',1,1)) desc;

--查找最近1分钟内最消耗cpu的session select ash.SESSION_ID,count(*) from v$active_session_history ash  where ash.SESSION_STATE='ON CPU' and ash.SAMPLE_TIME>sysdate-1/(24*60) group by ash.SESSION_ID order by count(*) desc
--查找最近1分钟内最消耗资源的session SELECT ash.session_id,ash.session_serial#,ash.user_id,ash.program, sum(decode(ash.session_state,'ON CPU',1,0)) "CPU", sum(decode(ash.session_state,'WAITING',1,0)), sum(decode(ash.session_state,'WAITING',decode(en.wait_class,'USER I/O',1,0),0)) "WAITING", sum(decode(ash.session_state,'WAITING',decode(en.wait_class,'USER I/O',1,0),0)) "IO", sum(decode(ash.session_state,'ON CPU',1,1)) "TOTAL" FROM V$ACTIVE_SESSION_HISTORY ASH,V$EVENT_NAME EN WHERE en.event#=ash.event# and ash.sample_time >sysdate-1/(24*60) GROUP BY ash.session_id,ash.user_id,ash.session_serial#,ash.program ORDER BY sum(decode(ash.session_state,'ON CPU',1,1)) desc