Workload Stats vs NoWorkload stats

What do you guys prefer? I understand noworkload is the new default but from reading about these, to me workload seems better no? Workload stats gather is against actual workload and noworkload is based on random reads and stuff.
Thoughts?

Gunners wrote:
What do you guys prefer? I understand noworkload is the new default but from reading about these, to me workload seems better no? Workload stats gather is against actual workload and noworkload is based on random reads and stuff.
Thoughts?Gunners,
NOWORKLOAD statistics are the default until the DBA collects system/CPU statistics. The system/CPU statistics only need to be collected once when the server is under a typical to heavy load (or after a change in the server's configuration). Take a look at the following from a test server (I posted this in another recent thread):
The following output shows a case where system statistics have not been gathered:
PNAME                PVAL1 PVAL2
STATUS                     COMPLETED
DSTART                     07-11-2009 00:04
DSTOP                      07-11-2009 07:43
FLAGS                    0
CPUSPEEDNW      2551.04281
IOSEEKTIM               10
IOTFRSPEED            4096
SREADTIM
MREADTIM
CPUSPEED              2752
MBRC
MAXTHR
SLAVETHR
The following shows a case where the system statistics have been gathered, but possibly with not a heavy workload:
PNAME                PVAL1 PVAL2
STATUS                     COMPLETED
DSTART                     08-01-2009 23:29
DSTOP                      08-01-2009 23:29
FLAGS                    1
CPUSPEEDNW      2545.45455
IOSEEKTIM               10
IOTFRSPEED            4096
SREADTIM              .427
MREADTIM             3.782
CPUSPEED              2664
MBRC                    32
MAXTHR            19181568
SLAVETHRAs you can see from the above, much more information about the server's performance is available to the cost-based optimizer when workload system/CPU statistics are available. Ideally, the optimizer should have as much information as possible to make good decisions when developing plans for queries.
You might want to take a look at the following articles to see how the system/CPU statistics are used by the cost-based optimizer:
http://richardfoote.wordpress.com/2009/11/25/the-cbo-cpu-costing-model-indexes-vs-full-table-scans/
http://jonathanlewis.wordpress.com/2007/04/30/system-statistics/
http://jonathanlewis.wordpress.com/2007/05/20/system-stats-strategy/
http://jonathanlewis.wordpress.com/2007/10/17/system-statistics-3/
Charles Hooper
Co-author of "Expert Oracle Practices: Oracle Database Administration from the Oak Table"
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

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System Stats opinions Please - WORKLOAD vs. NOWORKLOAD?

Dear Experts,
Bit of a background - We've a big (10TB) 10.2.0.5, 5 node RAC system for a big Oracle eBusiness Suite (R12 - HRMS/Payroll) implementation and at the minute we are running on some old (2 years old) gathered NOWORKLOAD system stats and since then a significant underlying IO infrastructure change has gone in and we are planning to upgrade the underlying server infrastructure from IBM P5 to IBM P7 soon as well (which introduces significant CPU changes etc.) and me personally think its the time to let Oracle know about all these changes under the carpet by updating the System Stats and since its likely going to be a significant change as potentially all the plans will be impacted (and few/some might go in an unintended direction) so want to know your opinion on these questions about it please :
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OR
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3. We are planning to go 11g (11.2.0.2+) in the 2nd half to next year as well - is better to leave this evil till then if 11g introduces or improves the system stats mechanism significantly? An opinion favoring this is also that we'll get better and more robust testings done if we pile it on 11g project so may be a bit safer approach (and better for work/human resources planning as well).
Out of the 5 RAC nodes, 2 are dedicated to OLTP stuff, 2 for Batch (Payrolls etc.) and 1 for (low priority) Reporting so obviously there are concerns around getting to a setting that's going to be the best fit for all of them and since thats not easy to achieve the risk is higher.
I am sure I am not new here and some of you'd have come across these questions as well so am wondering if I can get some opinions or advices please? Particularly from the people who have gone from NOWORKLOAD to WORKLOAD (preferable eBusiness suite and even better HRMS/Payroll) please and also from the people who've distributed workload like we have on difference RAC nodes- if they can share their experiences on how did it go for them - that'll be good please? (Obviously everyone's system is different and so is everyone's workload but if 8 out 10 say its been good for them or even bad - then that gives a bit of a feel about it).
Or are most people still running on 'safer' NOWROKLAOD stats please becs WORKLOAD is deemed to be a bigger change?
Also, in the end - I've heard some not so great stuff about IBM P7 as well - just wondering if there are people out there with some experience on these as well please?
Thanks in advance.

pdthedba wrote:
3. We are planning to go 11g (11.2.0.2+) in the 2nd half to next year as well - is better to leave this evil till then if 11g introduces or improves the system stats mechanism significantly? An opinion favoring this is also that we'll get better and more robust testings done if we pile it on 11g project so may be a bit safer approach (and better for work/human resources planning as well).Be careful about gathering system statistics in 11.2.0.2. Why? Well there is a bug.
Workload System Statistics Bug in 11.2
However, as of earlier this year there is a patch to fix it: 9842771.

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flag.jpg ‏166 KB

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//ShowActiveStatesForAllFirstlevelMSOs_DOCUMENT.jsx
//Uwe Laubender
//See discussion at:
//http://forums.adobe.com/thread/1365865?tstart=0
* @@@BUILDINFO@@@ ShowActiveStatesForAllFirstlevelMSOs_DOCUMENT.jsx !Version! Sat Jan 04 2014 11:41:46 GMT+0100
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