Semaphores/root

[Nobody's Hero]

My dba called this morning and wants to know why I have so many semaphores owned by root. I don't know why. Can someone inform me, I am not sure about this.

[James R. Ferguson]

Hi Robert:

I would expect some semaphores owned by root.

Exactly what your DBA considers "many" isn't clear. Perhaps Knowledge Base document #KBRC00013403 will help.

Regards!

...JRF...

[Nobody's Hero]

James,

How can you tell what process has the semaphore?

[Steven E. Protter]

Shalom Robert,

Many root processes like httpd servers and such use semaphores. That is the nature of the OS.

If the dba needs more as sysadmin you can provide him/her more by increase shmseg or shmmax

Your dba should stick to dba work unless there is a real issue requiring him to look.

Just a cheeky opinion.

Seriously why is the dba looking into it. If its boredome surely there is something better to do. If there is an issue, lets hear it.

SEP

[James R. Ferguson · Accepted solution]

Hi (again) Robert:

There is a tool, 'seminfo' as mentioned in the document (#KBRC00013403) which you can obtain from the Response Center to diagnose the owning pid.

Regards!

...JRF...