Kudos to you. Dba Z. (Data Warehouse Oracle DBA Senior) LikeLike Reply Muhammad Abdul Halim (@Halimju) says: 29/05/2012 at 10:07 very nice levi. The problem first happend on 8/27 the day after we had installed McAfee Anti-Virus on all our servers including this one. Sure raid 10 is "faster" then raid 5 -- however -- do they have an identifiable problem that needs FIXING. Source
o snapshot it again then join the snaps together and compare the diffs. This means that it is better to always have some spare headroom on such systems, doesn't it? Tom, do you think that this can be done efficiently in a single query? About me ← RMAN Performance Tuning Using Buffer MemoryParameters Minimum Software Versions and Patches Required to Support Oracle Products on IBM PowerSystems → Resolving High CPU Usage on OracleServers Posted: 12/01/2011 https://www.experts-exchange.com/questions/20801634/ORACLE-EXE-Hangs-using-100-CPU-reboot-needed.html
make sure you are using the CBO currently. While in Linux the Oracle instance uses a dedicated process model on Windows server, the instance is composed from one oracle.exe process and many different threads. Just build stupid application with stupid non-optimized SQL's and you will be bounded on I/O or enqueue or something else (that means you can achieve 50% idle with only 8 processes See http://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:359617936136
but again -- you are taking the wrong approach.
Other "common sense" things I hear all of the time: o rebuild indexes on a schedule. Use the following query to get details about the specific session SQL> select proc.spid ThreadNO,
raid 5 is typically bought on the cheap. Cpu Utilization In Oracle Database Submit your e-mail address below. Manage your content with the IBM Digital Experience WCM platform IBM Digital Experience is a WCM platform that offers users features for creating and managing digital content that can be ... Go Here November 05, 2004 - 10:49 pm UTC Reviewer: Sean from NJ, USA Hi Tom, We allow analysts to query production db and give some developers more privilege such as "create table
The tablespaces have enough space and each datafile in the tablespace doesn't cross more than 500 MB in size. Oracle High Cpu Usage Query You need to benchmark, that will be the only accurate way to size. Here is an excerpt: Snap Id Snap Time Sessions Curs/Sess Comment ------- ------------------ -------- --------- ------------------- Begin Snap: 221 11-Aug-04 09:45:37 26 3.7 End Snap: 222 11-Aug-04 10:08:02 22 3.1 Elapsed: Analysts are supposed to use tuned sql statement and developer are supposed to run "create table as " as a batch job during off peak hour (night).
The conclusion from analyzing the collected data was that a specific query was consuming most of the CPU and needed to be tuned. http://searchoracle.techtarget.com/answer/Oracle-exe-taking-99-of-CPU Do you do the same for RAM? Oracle High Cpu Usage That shows you HISTORICALLY current running sql which use a lot of resources November 07, 2004 - 5:02 pm UTC Reviewer: Sean from NJ, USA Hi Tom, I am sorry to How To Check Cpu Utilization In Oracle 11g Sometimes you do not care about M/M/n theory while considering the overall response time for the critical business units.
Reviews Write a Review Excellent....... this contact form I should have dropped cpu term in my question. there might be some indication of what is happening there. It means it is an application you are running that is running that sql. How To Check Cpu Usage In Oracle Database
Feel free to ask questions on our Oracle forum. Had we been, probably we'd have had a hard time with our end-users. If you are too busy now, I would appreciate if you please try to answer later. have a peek here Followup May 28, 2003 - 6:36 am UTC 1) insufficient data. 100 to 200 concurrently ACTIVE sessions (hitting the enter key simultaneously).
Have a look at this : http://it.toolbox.com/blogs/david/how-to-identify-cpu-hogging-oracle-sessions-on-a-windows-server-21789 Tom Report message to a moderator Previous Topic: SQL performance Tuning help Next Topic: Choosing execution plan with optimizer_index_caching Oracle 11g High Cpu Usage The run queue is the number of tasks waiting for execution, including those tasks that are currently being serviced.In other words, if your UNIX server with eight CPUs has a run It could depend on the type of workload February 06, 2003 - 12:55 am UTC Reviewer: Ramakrishna from India Dear Tom, You have said: "Are you at 100% utilization?
In order to do so we'll need a process explorer that supports displaying threads within processes. I mean, you cannot have a plan of attack without knowing what you are attacking..... There has to be some "comfort zone". Oracle Rdbms Kernel Executable High Memory Usage Sometimes, end users complained that application is slower than usual.
The server is a Windows 2000 Advanced Server w/ clustering, service pack 3, Quad 900Mhz CPUs and 8GB ram. Confused...again!! it is just a number that has to be taken into consideration along with every other number and by itself it not very meaningful. http://silkiconfinder.com/cpu-usage/oracle-cpu-usage-per-session.html If the enqueues are epidemic, you of course can use v$lock to view blockers and blockees.
I mean how can i come to know which Oracle process is eating ?Gurpreet S. Let's say that here is an application that uses 100% of the cpu for 10min every day. February 09, 2003 - 11:25 am UTC Reviewer: A reader Followup February 09, 2003 - 3:25 pm UTC No, TPS = transactions per second as reported by statspack for example. Thanks Followup August 12, 2004 - 7:38 am UTC statspack is not very useful for tuning an application, enqueues are an application problem.
Sort of like buying a stock race car for street driving. If so, identify it and then come up with solutions. I can say I run over 1,000 users doing "oltpish" applications on a 7 year old 4 cpu sparc. I think I understood how the parallelism works.
In many cases you do not care then some fast SQL is executed 50% slower because of the queueing theory because you spent more on the sending SQL from for example don't see where raid 10 comes into play necessarily. ..... For example, keep an eye on the CPU run queue column. If you ask 1,000 people for the definition of a "transaction", you'll probably get about 5,000 different responses.
CPU utilization is alot like cache hit ratios (except of course people want low cpu like golf scores and high cache hit like basketball scors). "hey, I've got 99.9% cache hit Is that a bad thing? Forgot your password? I know these are not linear and it involves much more (and not sure of your specifics)...but this surprised me.
See the book "Oracle Tuning: The Definitive Reference", for working session tracing scripts.- SQL Trace - The ancient TKPROF and MetaLink SQL tracing utility provides SQL session tracing.- Trace files - It looks to be on a Windows server platform based on your mention of Oracle.exe process. Here is scenario: The server is slow, let us find which sql are culprit. Gill burleson View Member Profile Jan 17 2007, 07:30 AM Post #4 Advanced Member Group: Members Posts: 13,285 Joined: 26-January 04 Member No.: 13 Hi Gurpeet,>> my CPU usages goes
A runaway is a runaway -- it only takes one to completely overpower a CPU. If anyone has any suggestions on what to look at next that would be very helpful. comfort zone = *peak* minus *mean* <> wasted cycles.
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