Oracle taking 100% CPU usage

Hi,
I have a situation. I am trying to execute a big query by involving 3 tables (joins). The query is taking about 20 minutes time to execute. While the query is executing the CPU usage for ORACLE is 100%. Please put somelight on this as of to why this is happening? Do I need to tweak my query a bit more. This is happening only recently as there are more number of records. ORACLE is installed on a Unix machine
Thanks in advance.

The First Rule Of Performance Troubleshooting: IDENTIFY THE PERFORMANCE PROBLEM.
All you have done thus far is identifying a symptom. High CPU utilisation. This in itself is totally meaningless - nothing can be inferred from this symptom without additional troubleshooting.
This means determining WHAT is happening when that query/process runs. What is it doing? (look at wait states and event state summaries of the process)
WHY is it doing that? Look at the execution plan.
With performance tuning, one needs to deal with facts. So you need to pop the hood and get your hands dirty so see what is actually happening under the hood.

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When I log in to EM, I can see section
Host CPU
It is 100%.
I have only instance named "parama". and it uses 1% CPU ant the picture shows that 99% CPU is used By Other.
What is Other? Why does it use that much CPU?
I had another oracle instance few months ago, but I is not used now (it is not even started).
How do I restore normal system performance?
Can I kill these processes?

Hello,
I have a similar problem. I see 2 perl processes related to Oracle that are taking up 99% of 2 cpus. These 2 perl processes have been running for days and keeping the load average high (above 2) on a mostly idle system.
The 2 perl processes are running:
/oracle/app/product/10.2.0/db_1/perl/bin/perl /oracle/app/product/10.2.0/db_1/sysman/admin/scripts/db/dbarchfull.pl
and
/oracle/app/product/10.2.0/db_1/perl/bin/perl /oracle/app/product/10.2.0/db_1/sysman/admin/scripts/db/dbresp.pl
Has anyone seen this problem? Can I kill the perl processes?
--Dan

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Hi,
There is a similar thread, please change the performance options in WSB from fast to normal:
wbengine.exe taking all CPU
http://social.technet.microsoft.com/Forums/en-US/be5d5743-1ea7-4c26-8072-0c010b47dd9a/wbengineexe-taking-all-cpu?forum=winserveressentials
If the issue still exists, please check if there any error message in the Event Log.
Best Regards,
Mandy
We
are trying to better understand customer views on social support experience, so your participation in this
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100% CPU usage... does anyone else get this?

Here is my code. I would have simplidied it for you... but I honestly have no idea where it went wrong.
One second it is running fine, the next it starts taking up 100% of my CPU cycles. I can't figure out what I did to it to make it do this... nothing I added creates an infinite loop or infinite threads. It's just... weird.
The code is probably too big for anyone to look at and tell me what's wrong, but can someone else download it and tell me if you also get 100% CPU usage? It needs to be run on Windows... it uses a couple JNI calls that are Windows-specific. Those calls were the first place I looked when trying to find the problem, but I have not changed that part of the code for a long time, and it has never been a problem before.
Don't run the bat file... just navigate to the Watchdog2 directory and do 'java Watchdog'.
Are there any tools that can help me figure out where the program is getting hung up? It's not freezing at any specific spot... just moving super slow and taking up 100% of my CPU. I'm so confused...
Message was edited by:
L4E_WakaMol-King

Nevermind!
Sorry for the trouble. The problem was that last time I compiled the code, it reverted back to and older version of a class I had compiled days ago. Why it did this is totally beyond me... but it did, and it just so happens that the old version of that class combined with the new version of my program were the perfect recipe for an infinite loop.
Seriously, if you are in inveterate debugger, you might get a good laugh out of this. I've spent the last week and a half trying to find a way to set the Windows console into cbreak mode (single character processing rather than line-at-a-time processing), and I finally managed to do it by writing some c code and putting it into a DLL with the JNI. So now my program (which runs from the console) can process each character as it is entered rather than waiting for a line return. The older version of the class that got reverted was one that used System.in rather than the input stream generated by the socket. I had set it to System.in for testing purposes, and apparently that testing version is the one it got reverted back to. So combine the two, and you have a console that is feeding System.in each character as it is pressed and a socket wrapper that is listening infinitely. It was a mess... but an uncannily serindipitous mess...
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Hi PLEASE HELP
I have no idea what is going on but syslogd has suddenly started taking 100% CPU.
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This topic should be a Sticky untill Apple releases a fix for the issue!
Also these 2 Links are very useful!
http://smartic.us/2007/11/8/leopard-100-cpu-usage-caused-by-syslogd-and-possibly -time-machine
http://julianschrader.de/20080131-100-cpu-usage-caused-by-syslogd-leopard/

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Sorry for using Python and not e.g. C++, but it's a lot shorter that way.

We have looked at the issues and they are valid. We will roll the fixes out for this in our next release of BDB. The test case was very useful and really helped to speed the process up. If you have any questions, please contact me directly at [email protected] Thanks again for bringing this to our attention.
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http://i.imgur.com/dlgObPb.jpg
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http://i.imgur.com/Zf77V6b.jpg
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Hi @EugenX ,
I have brought your issue to the attention of an appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post serial numbers and case details.
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Hello,
I am trying to write a dll with labwindows/cvi that allows me to create a TCP Server. This dll is integrated in labview.I created this Dll with example provides by Labwindows/cvi(rtserver.dll).
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Deathstalker (Richard),
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the problem that was obvious to me.
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Music store & 100% CPU usage

I've had this problem on my newly built computer, and my older machine. When I browse the iTunes music store, the status bar on the top will often move like it's opening the music store, but it'll do this for a long period of time (several minutes) and iTunes will work, but the music store will not load, and you cannot click the 'X' to stop the contacting of the music store. During this time if you open task manager, iTunes uses 100% of CPU resources. If you close iTunes it still uses 100%. you have to end the process in task manager in order to make it stop. On occasion the music store will work to view maybe one album, but if you search for another album, or click another link it'll do the whole not-responding-100% CPU usage cycle again.
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Some specs on my machine if this will help
Asus motherboard
AMD Athlon XP 4000+ processor
2gb Kingston 184 pin DDR ram
Seagate SATA II 160 GB HD
Windows XP PRO service pack 2
thanks for your help!

I'm only guessing here, but perhaps iTunes is having a conflict with another application. If you are anything like me you probably install your favourite applications on all your computers. As a shortcut to troubleshooting, perhaps consider an application you have installed on the desktops, but NOT on the laptop. Then try uninstalling that application from your desktop computer and test iTunes.
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For some reason my iCal application uses 100% of CPU. What can I do to avoid it?

I had a similar problem with iTunes.
Here's the link to what fixed my problem immediately. Please note: my problem was resolved following just the three steps pasted below. The original link has additional steps that may be necessary, although I did not employ them, and my problem of 100% CPU USAGE is gone!!! Thank God!
URL source: http://www.hotcomm.com/faq/FAQ_ResetWinsock.asp
Good Luck
Copyright (c) 2009 1stWorks Corporation. All rights reserved.
This article gives instructions for resetting Winsock on Windows XP and Windows Vista:
Reset Winsock (Vista)
To reset Winsock in Vista:
1.Click the Windows Start button.
2. Type Cmd in the Start Search text box and press Ctrl-Shift-Enter (keyboard shortcut to run Command Prompt as Administrator). Click Continue to allow elevation request.
3. Type netsh winsock reset in the Command Prompt shell, and then press the Enter key.
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Procedure is taking 100% cpu

Hi ,
One of my procedure is taking 100% CPU, I looked execution plan .. But I am not sure what to look on that .. I didn't find any anything wrong in execution plan. like all are index seek .. Even the query is not taking much time just 2 sec
Regards Vikas Pathak

In addition to great suggestion Sean has been posted , I always start with the below
---This first thing to check if CPU is at 100% is to look for parallel queries:
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select * from sys.dm_os_tasks as t
where t.session_id in (
select t1.session_id
from sys.dm_os_tasks as t1
group by t1.session_id
having count(*) > 1
and min(t1.request_id) = max(t1.request_id));
-- Requests running in parallel:
select *
from sys.dm_exec_requests as r
join (
select t1.session_id, min(t1.request_id)
from sys.dm_os_tasks as t1
group by t1.session_id
having count(*) > 1
and min(t1.request_id) = max(t1.request_id)
) as t(session_id, request_id)
on r.session_id = t.session_id
and r.request_id = t.request_id;
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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Oracle taking 100% CPU usage

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