DBWR is consuming high CPU

Hi,
I'm experiencing bug in Oracle version 10.2.0.3:
7385253 – DBWR IS CONSUMING HIGH CPU
The explanation of the bug on metalink says its from version 10.2.0.4 and there is a patch.
My question is, if this bug was also present in 10.2.0.3 and can the patch be applied to this version of Oracle DB.
Cheers.

Hi,
AFAIK, it won't support, since patch on 10.2.0.3 would required additional files which not available onthat current version, so its fix on the top of 10.2.0.4. I am not sure whether it will work or not.
- Pavan Kumar N
- ORACLE OCP - 9i/10g
https://www.oracleinternals.blogspot.com

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Dbwr consuming high CPU after enabling DirectIO

Hi,
DBWR is consuming high CPU. After enabling DirectIO on Solaris SPARC 10, dbwr is eating away almost 1 CPU on a v440 machine i.e. 19% throughout the day. Neither of "buffer busy waits" or "write complete waits" or "free buffer waits" are in the top 5 wait events, which, to me, means that there is no buffer contention.
What I understand is that after enabling DirectIO, it takes longer for the IO to complete because pre-DirectIO it would return from the file system cache whereas now it has to return from the disk (and I do see at the OS level that IO has become slow), but should that result in dbwr consuming more CPU?
Infact after enabling DirectIO, IO has become very slow which is another problem and as a result log file writes have also become slow which is a 3rd problem. btw, I am aware that if there were many FTS, then DirectIO can make the system slow but there are no FTS in my case. Also, that SGA should be increased after enabling DirectIO, which has also been done.
Thanks

user12022918 wrote:
DBWR is consuming high CPU. After enabling DirectIO on Solaris SPARC 10, dbwr is eating away almost 1 CPU on a v440 machine i.e. 19% throughout the day. 19% is less than 1/5th of a CPU. Or are you referring to a 100% being all 4 CPUs?
What I understand is that after enabling DirectIO, it takes longer for the IO to complete because pre-DirectIO it would return from the file system cache whereas now it has to return from the disk Incorrect. See directio for details.
Yes, removing the file system cache from the I/O layer for a device can reduce I/O performance if the caller does not perform its own caching. However, direct I/O will eliminate the system cache overheads (and associated CPU resources needed) from a caller (like Oracle) that implements its own sophisticated buffer cache.
Direct I/O should therefore increase Oracle I/O performance and decrease resource footprint as it eliminates the need for the kernel to maintain a cache for that device.
Infact after enabling DirectIO, IO has become very slow which is another problem and as a result log file writes have also become slow which is a 3rd problem. Direct I/O, as per the Sun docs, is an advisory call. It may not place that device in direct I/O modes. It may result in partial direct I/O. So you need to make sure exactly what happens and how successful (partial or complete) this setting was.
btw, I am aware that if there were many FTS, then DirectIO can make the system slow but there are no FTS in my case. FTS (multi block reads/large sequential reads) is slower? This is contrary to Sun's docs that state:
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hi
there are two web application running on the the standlone server.one of the web application is sudendly consumming high cpu usage. because of this issue, the entire cpu usages become very high and result in HTTP THROTTLING error. please suggest ways to
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Hi jackhill,
Please check whether you configure Search service in your SharePoint.
And please use Taskmgr on the server to check which process may be cause this issue.
In addition, there is an article about high CPU in SharePoint 2013, please check if it is useful for you:
https://speverything.wordpress.com/2013/03/12/sharepoint-2013-high-cpu-and-memory-utilization-killing-my-server/
Thanks,
Wendy
TechNet Community Support
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

RMAN backup consuming high CPU

DB:10.2.0.2
OS:Solaris 5.8
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16 22 * * 4 /home/ora10g/scripts/rman/rman_full_backup10g.ksh ******** 2>&1# Full Backup
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report obsolete;
delete noprompt obsolete;
run {
backup database;
sql 'ALTER SYSTEM ARCHIVE LOG CURRENT';
Archive backup script:
run {
backup archivelog all not backed up 1 times;
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 60 DAYS;
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CONFIGURE CONTROLFILE AUTOBACKUP ON;
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CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE SBT_TAPE TO 1; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
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set a transition rate for your channels
ALLOCATE CHANNEL backup_disk1 DEVICE TYPE disk
FORMAT '/u01/BKP/%U'
MAXPIECESIZE 2000 M
RATE 1M;
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Process svchost consuming high cpu 99 %

Hi,
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We have installed iis 6 in windows server 2003 and the process 832 svchost consuming the high cpu and causing the slow response of the applications, hence please advise the possible work around for the same
please find below the dump analysis
All Operations
Tip:
To search on any particular function in the list below, highlight it with the mouse then press CTRL+C, CTRL+F, CTRL+V. This will highlight all the call stacks which contain the particular function and allow you to jump between them in
the browser.
Top 40 functions in all operations (excludes boiler-plate functions)
ntdll!NtReplyWaitReceivePortEx
svchost!ServiceStarter
advapi32!ScSvcctrlThreadA
ntdll!ZwRemoveIoCompletion
ntdll!ZwDelayExecution
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rpcrt4!RPC_INTERFACE::DispatchToStubWorker
rpcrt4!RPC_INTERFACE::DispatchToStub
rpcrt4!LRPC_SCALL::DealWithRequestMessage
rpcrt4!LRPC_ADDRESS::DealWithLRPCRequest
ntdll!RtlpWaitThread
authz!AuthzpDeQueueThreadWorker
rpcrt4!COMMON_ProcessCalls
rpcrt4!LOADABLE_TRANSPORT::ProcessIOEvents
rpcrt4!ProcessIOEventsWrapper
browser!BrWorkerThread
vssapi!CVssWriterImpl::RequestWriterInfo
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rpcrt4!RPC_INTERFACE::DispatchToStubWithObject
ncobjapi!CNamedPipeClient::ProviderReadyThreadProc
msvcrt!_endthreadex
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SMON process consume High CPU in production setup.

Hi,
Recently we migrate our storage from IBM DS4700 to IBM v7000. on last Saturday from yesterday and today cpu almost 100 percent in peak hours.
Right now our datafiles in SSD and archivelogs in SAS disk.
Please suggest
regards,
Karthi.

Hi Karthi,
Which SMON process is consuming CPU ,I mean,Database SMON /ASM SMON if is in use.
+ Install and enable OSwatcher with atleast 30 seconds interval and monitor which process /what is causing high CPU.
+ If they are oracle processes ,then validate what are they doing at database level .
Does it comes from any application code ,if so validate those sqls.
+ Install procwatcher to understand what are they doing .
Refer::-----------
==============
Procwatcher: Script to Monitor and Examine Oracle DB and Clusterware Processes (Doc ID 459694.1)
+ Then as per your environment get pstack/procstack of that process in 30 seconds interval for 3-4 times .
If try to identify the issue ,if required please open service request with us.
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Aritra

For Finding sql statements which consumes High CPU

Hai,
Can any help me for finding, which sql statements are comsumes high CPU

generaly:
1. from unix site :
us top command or ps (but this depend on platform) -> use pid in select * from v$process where spid <>
2. from db site
select * from v$sql_area order by buffer_gets desc ;
this can You join with v$session where v$session.sql_address=v$sqlarea.address
and when You wont to see % of os select *spid from v$process where addr=<v$session.paddr>
and then in unix ps -ef | grep <spid>
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In 10g
from AWR dba_hist_osstat -> DBA_HIST_SQLSTAT You can see high usage CPU interval , but this show You not momentaly action , but historical data
momentali from ASH
now I study viraq_sh script ... I thing this answer your question tottally
Message was edited by:
branislav.dobrotka

CMS and Parallel GC consumes high CPU-Need Help

Hi,
We are using Hot Spot 64 bit JVM(java.runtime.version=1.6.0_26-b03,java.vm.version=20.1-b02),And in production we are facing a issue with long pause time during GC.While monitoring we also observed that CPU consumption(Almost >90%) during GC was very high.
Currently we use three 8 core 32 GB RHEL server each having total of 4 JVM with following config
Box(Server) 1:
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Box(Server) 2:
1)2 online JVM with xms=xmx=4g and xmn=1g,GC-CMS,initialoccupationfrequency=50%
2)2 batch JVM with xmx=4GB,xms=512MB ,GC-parallelGC
Box(Server) 3:
1)2 online JVM with xms=xmx=4g and xmn=1g,GC-parallelGC
2)2 batch JVM with xmx=4GB,xms=512MB GC-parallelGC
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My quesstions
1)How much resource normally CMS or Parallel GC consumes?
2)Does having 4 JVM in a server causes this problem?What is the optimum to have?
3)What will happen if all the four JVM triggers GC

Hi,
We are using Hot Spot 64 bit JVM(java.runtime.version=1.6.0_26-b03,java.vm.version=20.1-b02),And in production we are facing a issue with long pause time during GC.While monitoring we also observed that CPU consumption(Almost >90%) during GC was very high.
Currently we use three 8 core 32 GB RHEL server each having total of 4 JVM with following config
Box(Server) 1:
1)2 online JVM with xms=xmx=4g and xmn=1g,GC-CMS,initialoccupationfrequency=50%
2)2 batch JVM with xmx=4GB,xms=512MB,GC-parallelGC
Box(Server) 2:
1)2 online JVM with xms=xmx=4g and xmn=1g,GC-CMS,initialoccupationfrequency=50%
2)2 batch JVM with xmx=4GB,xms=512MB ,GC-parallelGC
Box(Server) 3:
1)2 online JVM with xms=xmx=4g and xmn=1g,GC-parallelGC
2)2 batch JVM with xmx=4GB,xms=512MB GC-parallelGC
We are facing similar issue in all the three servers,At first we had CMS for all the online JVM's.We suspected CMS as the reason for CPU consumption so we swapped to ParallelGC on one box but still facing the same issue.We have a dependency from an external system,if the GC is more than 60 sec the extrenal system will disconnect.thisi is hampering our daily activities a lot.This issue is occuring during less load on the system with less network utilization Can any one help on this.
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Ora 10gR2 on Solaris9 : smon consuming high cpu

Hi,
I noticed that the smon process is consuming abnormal amounts of CPU.
At startup, every time, it uses +/- 13 seconds of cpu. Afterwards, at regular times , it starts again consuming cpu.
After running 3 days, it consumed +/- 400 secs, while it is only a small development database, hardly used !
I ran the query :
select count(*) from DBA_FREE_SPACE;
----> this number is steady (+/- 70)
select tablespace_name, segment_name, segment_type, sum(bytes),
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where segment_type = 'TEMPORARY';
----> no rows
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Thanks
Linde Ackermans
Edited by: user602338 on 04-Dec-2008 05:53

Hi,
I noticed that the smon process is consuming abnormal amounts of CPU.
At startup, every time, it uses +/- 13 seconds of cpu. Afterwards, at regular times , it starts again consuming cpu.
After running 3 days, it consumed +/- 400 secs, while it is only a small development database, hardly used !
I ran the query :
select count(*) from DBA_FREE_SPACE;
----> this number is steady (+/- 70)
select tablespace_name, segment_name, segment_type, sum(bytes),
count(extent_id)
from dba_extents
where segment_type = 'TEMPORARY';
----> no rows
So what is smon doing then ???? How can I find out how to correct ?
Thanks
Linde Ackermans
Edited by: user602338 on 04-Dec-2008 05:53

Oracle 11g perl script consuming high cpu

Hello,
I'm running Oracle Database 11g Release 11.2.0.1.0 - 64bit Production on a Windows system and periodically it runs a perl script, parse-log1.pl and it consumes a lot of cpu. I find it irritating. I've searched around and I've seen issues if the machine has no c: drive but this machine does have a c: drive. Granted Oracle is not installed on c: drive but should that matter. I've tried looking in the script and I see no references to c: nor any of the scripts the parse-log1.pl requires. Is there any way to fix this?

835321 wrote:
Hello,
I'm running Oracle Database 11g Release 11.2.0.1.0 - 64bit Production on a Windows system and periodically it runs a perl script, parse-log1.pl and it consumes a lot of cpu. I find it irritating. I've searched around and I've seen issues if the machine has no c: drive but this machine does have a c: drive. Granted Oracle is not installed on c: drive but should that matter. I've tried looking in the script and I see no references to c: nor any of the scripts the parse-log1.pl requires. Is there any way to fix this?include sleep inside loop
http://perldoc.perl.org/functions/sleep.html

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When user experiences slowness in accessing the iPlanet Portal Server, I realise that the Profile Server hit a cpu of 96% using prstat command in solaris. The process is ns-httpd.
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Before you start tuning, you would need the following information ..
1.) What is the number of concurrent sessions on the system at any point of time ?
2.) What is the JVM Max heap size value set ?
3.) Are you using the gateway or is it an open portal ?
4.) size of your desktop, number of channels etc.
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6.) have you done any prior performance tuning ?
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when the system slows down do a ps -eLf | grep pid on the process id, it should list details abt the process like the number of threads open and the duration of each thread open and percentage of cpu used by each thread.
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High CPU

HI All,
BO Version is XIR 3.1 SP 6 on AIX 7.1 server. I have been observing that boe_cmsd consuming HIGH CPU Utilization 115.3.
restarted BO servers and also killed allxvfb process before starting. Still same Issue.
Restarting machine daily however observed still consuming same amount of CPU.
any suggestions?
Regards,
Rajkiran

Please check the amount of instances on different report objects if you don't have the limit set. And even if you have, try to check if has affected all the reports you have.
This was on 4.0 but I guess it can be the same 3.1. CPU load was high as well as mem usage. Eventually we found out that there were two reports that had about half a million instances per report. Setting the limit to affect also those reports and waiting intances to be cleaned, solved the issue. No more high CPU or mem usage.

Query to find adhoc queries taking high cpu on server

Hi,
I want to find all the adhoc and other queries consuming high cpu on sql server. sys.dm_exec_cahched_plan will only have cached queries and not the currently running ones.

Hi Preetha7,
According to your description, if you want to identify the most expensive SQL Server queries based on the cumulative CPU cost, you can use the DMVs of the sys.dm_exec_sql_text , the sys.dm_exec_query_plan and sys.dm_exec_query_stats. For example, you can
refer to the following T-SQL statement.
SELECT TOP 20
qs.sql_handle,
qs.execution_count,
qs.total_worker_time AS Total_CPU,
total_CPU_inSeconds = --Converted from microseconds
qs.total_worker_time/1000000,
average_CPU_inSeconds = --Converted from microseconds
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qs.total_elapsed_time,
total_elapsed_time_inSeconds = --Converted from microseconds
qs.total_elapsed_time/1000000,
st.text,
qp.query_plan
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high CPU.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/cb3e29ca-f1ef-4440-8f1a-db4924a43c5c/find-currently-session-that-is-costing-high-cpu?forum=sqldatabaseengine
http://blogs.msdn.com/b/batala/archive/2011/07/23/troubleshoot-high-cpu-issue-without-using-profile-traces.aspx
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support

Does 'prstat -J -n 1,100 -z global 1 1' command causes high CPU utlization?

Hi experts,
We used command 'prstat -J -n 1,100 -z global 1 1' to obtain the project statistics.
One of my customer who have around 800 processes with around 300 users facing problem on his machine whenver the above prstat command executed. As per his comments 'prstat' consuming high CPU.
He has using machine with following configuraton:
SunOS <machine name> 5.10 Generic_120011-14 sun4u sparc SUNW,Sun-Fire-V490
Is any one has face similar issue? Is it related to any OS patch?
Let me know any information regarding this.
Thanks,
Paresh

Hi Paresh,
I would like to tell you why don't you bind the particular process using solaris resource manager.

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