topic Re: ipcrm in Operating System - HP-UX

ipcrm

Luigi Manto — Thu, 29 Nov 2001 09:03:29 GMT

Hi everyone! I would just like to ask what are the guidelines that one should follow when executing ipcrm? How would you know if it safe to remove a certain memory segment or other information displayed with ipcs?

Thanks in advance!

Re: ipcrm

Alexander M. Ermes — Thu, 29 Nov 2001 09:08:27 GMT

Hi there.
You have to identify the memory segment absolutely sure.
If you refer to databases segements, you should start the databases with a unique user for easier identification.
Rgds
Alexander M. Ermes

Re: ipcrm

Varghese Mathew — Thu, 29 Nov 2001 09:23:28 GMT

Hi,

Just adding to the previous answer..

Verify the segemnts' usage, status etc by issuing:
#ipcs -mab
Sometimes (rarely) what happens is, the mode for a process shows the segemtn is detached and actually it is not, HP says it is fixed in their next version 11i.
To release some part of share memory segement you can do the same in the database level as well.

Like in Informix you can release some portion of caught memory by issuing
#onmode -f

Before issuing the command ipcrm you need to be very careful about the significance of the process etc..

Cheers !!!
Mathew

Re: ipcrm

Bill Hassell — Thu, 29 Nov 2001 17:42:55 GMT

In general, you should be able to remove any segment where NATTCH=0 and KEY=0x000000. The rest will require some handwork to see if they can be safely removed.