Comments on: Increasing Priority of lgwr Process using _high_priority_processes

By: osborne

osborne — Thu, 12 Jan 2012 01:39:37 +0000

Tri Tuc,

The answer is maybe it could help. Those wait events are related to moving blocks between RAC nodes, so the best resolution would be to figure out why so many blocks have to move (as opposed to just rtying to make the move faster). Maybe some sort of workload partitioning would work better.

Kerry

By: Tri Tuc

Tri Tuc — Tue, 10 Jan 2012 04:22:10 +0000

Hi Kerry,

Our system is Rac 3 nodes 10.2.0.4

In Top 5 Timed Events

gcs log flush sync 2,324,321 2,311 1 8.6 Other
gc cr block busy 308,219 2,079 7 7.7 Cluster

cpu_count = 128
_high_priority_processes LMS* LMS*

–> do i need
alter system set “_high_priority_processes”=”LMS*|LGWR*” scope=spfile sid=’*';

if “yes”, do you have any recommendation for me.

Thanks

By: osborne

osborne — Wed, 16 Nov 2011 16:45:53 +0000

By the way, I was asked if there was a reason to increase priority on pmon. The answer is no. It is just an example. I’m not suggesting to increase pmon priority to improve log file sync times.

By: Mutex waits. Part II. “Cursor: Pin S” in Oracle 11.2 _mutex_wait_scheme=0. Steps out of shadow. « Latch, mutex and beyond

Tue, 25 Oct 2011 16:23:40 +0000

[...] are not preempted by lower priority processes. We know that since 10g some of Oracle processes have Real-Time priority. By default only LMS and VKTM processes scheduled in RT class. These processes do not use mutexes. [...]

By: osborne

osborne — Tue, 13 Jul 2010 03:12:10 +0000

Sorry about that Dan. Should be fixed now!

Kerry

By: Dan Morgan

Dan Morgan — Tue, 13 Jul 2010 03:06:17 +0000

I was doing some research on good links on processes and ended up here in your blog. Which needless to say is now one of the links I will be giving my students.

But I noticed you are still pointing to my library but at an address that has turned into a rather large embarrassment as it is no longer mine and no longer belongs to the Oracle community: Rather to some spammers.

My new website name is \Morgan’s Library\ which is at http://www.morganslibrary.org/library.html.
You will find a lot of new material there, all updated to 11gR2, as well as another pages where I have been posting demos called \How Can I\ (http://www.morganslibrary.org/howcani.html).

If you would have a few minutes up update your pages I would be very appreciative.

Thanks.

Dan Morgan

By: osborne

osborne — Thu, 08 Jul 2010 02:52:49 +0000

Well there are advantages to staying in the middle of the pack.

Kerry

By: Damir Vadas

Damir Vadas — Tue, 06 Jul 2010 19:01:15 +0000

Hi!

SR is closed as unresolved and there is nothing else to do.
Main problem from mine point of view is Intel Itanium CPU, configuration that is really rare, so I think there is no testing configuration on Oracle Technical support side.
Rg,
Damir Vadas

By: Blogroll Report 12/03/2010 – 19/03/2010 « Coskan’s Approach to Oracle

Blogroll Report 12/03/2010 – 19/03/2010 « Coskan’s Approach to Oracle — Thu, 29 Apr 2010 18:15:07 +0000

[...] 10-How to increase process priority within Oracle with _high_priority_processes? Kerry Osborne-Increasing Priority of lgwr Process using _high_priority_processes [...]

By: Damir Vadas

Damir Vadas — Wed, 14 Apr 2010 09:01:27 +0000

Hi Kerry,

SR is opened. Sent RDA reports and waiting on their answer. For now they say it looks like a new bug ….

When find out let you know here…

Rg
Damir