Comments on: Semaphore Settings and Shared Memory for Oracle Database

By: Raj

Raj — Fri, 28 Mar 2008 05:21:50 +0000

Thank you for this interesting artical and for your support

By: Elaine

Elaine — Thu, 20 Mar 2008 07:00:39 +0000

This was a great mini tutorial/lesson!

By: ramya

ramya — Tue, 27 Nov 2007 09:28:49 +0000

Thanks for sharing the info

By: Niki T

Niki T — Wed, 18 Jul 2007 14:43:16 +0000

Very helpful and readable explanation when troubleshooting problem with cluster failover that produced following error:

ORA-27300: OS system dependent operation:semget failed with status: 28
ORA-27301: OS failure message: No space left on device
ORA-27302: failure occurred at: sskgpcreate

Thanks

By: Jon Emmons

Jon Emmons — Fri, 20 Oct 2006 12:21:28 +0000

Mashie,

I’ve never come up on a sem_undo problem. A quick google search turned up some information but most of it looks dated.

I’d suggest talking to your software vendor and/or Sun about this one. It’s probably a tunable parameter but that doesn’t necessarily mean you should go in and change it.

Good luck.

By: Mashie

Mashie — Fri, 20 Oct 2006 06:15:21 +0000

I am running officepower on a sun box v240. When people are opening attachments or documents it comes up with SEM_UNDO process limit exceeded and says could not create semaphore.

Can you advise?

By: nithin

nithin — Tue, 30 May 2006 07:07:55 +0000

Thank you….

By: suvankar chakraborty

suvankar chakraborty — Mon, 08 May 2006 09:50:57 +0000

it is superb excellent

By: Life After Coffee » Kernel Parameter Settings for Oracle on Solaris

Life After Coffee » Kernel Parameter Settings for Oracle on Solaris — Thu, 15 Dec 2005 21:39:49 +0000

[...] For a more in-depth explanation of these parameters see my other article Semaphore Settings and Shared Memory for Oracle Database. [...]

By: Jon

Jon — Tue, 13 Dec 2005 13:56:08 +0000

Chris, thanks for the info on SEMVMX! I did notice that it is not mentioned in the later Oracle documentation so I am not surprised to find out it is obsolete.

The Metalink note mentioned by Chris is a great reference for semaphore settings. It covers Database 8.0.5 through 10.2.

Thanks for sharing Chris!