How to check which query is consuming most resources....

Hi guys how can i check which query is consuming most resources , run by which user and how to kill that....
Khurana

1)     At the first stage, login to the server and at the OS level I run commands like TOP and see the overall performance of the Server. From this one can know the Total CPU Memory, CPU Usage, Memory Available, and Swap Memory Available and how busy the CPU is.
2)     Once you identify the top processes in the CPU, relate them to ORACLE using V$PROCESS.SPID = OS Process ID to get the V$PROCESS.ADDR and join this with the V$SESSION.PADDR to get the V$SESSION.SID and SERIAL# columns.
3)     Then enable the Session Trace using DBMS_SYSTEM.SET_SQL_TRACE_IN_SESSION.
4)     look on the Trace File using the TKPROF. During this sort the Trace File using various options like EXEELA/DSK, PRSELA/DSK, FCHELA /DSK.
5)     Once you identify the expensive SQL statements, inform the user about it and KILL the respective job.

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<Moderator Message: ok, subject is better now but you didn't search at all. Therefore thread is locked again>
Hi All,
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