Oracle-L: Re: 100% CPU utilization, urgent

From: Tim Gorman <Tim_at_SageLogix.com>
Date: Mon, 20 Jan 2003 09:14:37 -0800
Message-ID: <F001.00534CA0.20030120091437@fatcity.com>

RE: 100% CPU utilization, urgentWe seem to have switched email threads, but the value from the VALUE column in the query on V$SESSTAT is centiseconds of CPU consumed by the session. Although V$SESSTAT is not updated continuously (but rather in "spurts"), you should see a clear trend in which session is consuming the most CPU.

Whichever session is doing it, I would suggest enabling SQL Trace (a.k.a. "the big hammer") on the session and running TKPROF SORT=PRSELA,EXEELA,FCHELA against the raw ".trc" file produced...

...or use STATSPACK......or both...

Original Message ----- From: Hussain Ahmed Qadri To: Multiple recipients of list ORACLE-L Sent: Monday, January 20, 2003 8:24 AM Subject: RE: 100% CPU utilization, urgent

Thanks for the script, I would like to know how would I interpret the VALUES column, I mean what does it stand for. If the value of CPU used for a particular SID is 2000, what does that mean? Is it the time, in 1/100 th of seconds of the total CPU time? Can you please help me understand this?

Thanks and regards

Hussain

-----Original Message-----

From: Thomas Day [mailto:tday6_at_csc.com] Sent: Monday, January 20, 2003 7:00 PM To: Multiple recipients of list ORACLE-L Subject: Re: 100% CPU utilization, urgent

Create the view dba_nt_threads and query it, then run the monitor CPU per session. These are not my scripts --- I'm pretty sure that they were posted here by others --- but I did not capture the information on who originally wrote them. My apologies. HTH

--cr_dba_nt_threads.sql

run as sys create or replace view dba_NT_threads as select p.spid "ID_THREAD", p.background "BACKGROUND", b.name "NAME", s.sid "SID", s.serial# "SERIAL#", s.username "USERNAME", s.status "STATUS", s.osuser "OSUSER", s.program "PROGRAM" from v$process p, v$bgprocess b, v$session s where s.paddr = p.addr and b.paddr(+) = p.addr; create public synonym dba_nt_threads for dba_nt_threads; create public synonym threads for dba_nt_threads;
monitor CPU per session
requires timed statistics on col sid format 99999999 SELECT v.SID, SUBSTR(s.NAME,1,30) "Statistic", v.VALUE FROM V$STATNAME s, V$SESSTAT v WHERE s.NAME = 'CPU used by this session' AND v.STATISTIC# = s.STATISTIC#

                        Hussain Ahmed                                                                                                   

                        Qadri <hussain           To:      Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>                   

                        @skm.org.pk>             cc:                                                                                    

                        Sent by: root            urgent                                                  

                                                                                                                                        

                                                                                                                                        

                        01/20/2003 12:44                                                                                                

                        AM                                                                                                              

                        Please respond                                                                                                  

                        to ORACLE-L

HI all
We have a consistent problem of CPU utilization 100%. We have had this problem since Saturday, but it automatically subsided, I mean went back to normal after a few hours, and remained normal on Sunday as well. But its back to 100% since morning, that is when the load on the server has gone up again to 100% and over all work is non-existent.

Our machine is Compaq Proliant ML350, 900 MB ram, 933 single Processor, Database size of roughly 5 GB. WINNT4.0, Oracle 8.1.7.

I have checked the temporary tablespaces, they are normal. We have a 24x7 environment, a hospital, so please can you suggest the areas to look in to, its really very urgent.

Regards,

Hussain

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Received on Mon Jan 20 2003 - 11:14:37 CST