8 character limit for ipcs command , any way to increase # of chars ?


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Operating Systems Solaris 8 character limit for ipcs command , any way to increase # of chars ?
# 1  
8 character limit for ipcs command , any way to increase # of chars ?

Hello All,

We have a working script which identifies and kills ipcs resources which havent been correctly killed during normal shutdowns.
It is working fine and dandy however there are some issues now.

Environment:

Code:
SunOS 5.10 Generic_148888-03 sun4u sparc SUNW,SPARC-Enterprise

Problem :

Our target search string has increased by 1 character from 8 chars to 9. What I am observing @ this point is the ipcs -a | grep (9 char string) is returning blank results. The increase in characters is due to new naming conventions. So while it may be easy to say , "simply use an 8 char database", in practicality it is over my head.


Desired Solution:

I need to find a way to get ipcs to be able to identify resources associated with a 9 char search string. From what I have read so far I havent dug up an environment var or quick fix for this issue. I have also dug through a few posts here in the forum in the hopes of finding a solution.

Code Example:

a) Working:

Code:
      ipcs -a | grep 1245678

b) Not working

Code:
       ipcs -a | grep 123456789

Anything you can offer is appreciated!

There are logic tweaks I can make to the script however out of curiosity I would like to learn more about ipcs on solaris. Constantly hungry for skills!

Thank you! Smilie

Last edited by Scott; 08-29-2013 at 09:00 PM.. Reason: Code tags
# 2  
ipcs resources are kernel persistent. They cannot persist over a reboot. So, what you said appears to be wrong, or you need to do some more explanation - specifically 'database name' - what is it: a key generated by ftok()? What are we doing here?

How do you know that the shared memory for a db was not destroyed then recreated by a reboot? Rather than persisting over reboot.

Or do you mean a db shutdown/restart? We need clarity. And a decent example.
# 3  
Quote:
ipcs resources are kernel persistent. They cannot persist over a reboot. So, what you said appears to be wrong, or you need to do some more explanation - specifically 'database name' - what is it: a key generated by ftok()? What are we doing here?
- I did not imply a reboot was going to be done in any way shape or form, so if I gave that misinimpression I apologize. The issue is this:
1) We are using a script to clean up any hanging ps/ipcs resources that may be erroneosly be left over after we shut down application servers ( database servers are not being stopped/shutdown).

2) The script works as long as your target search string is up to 8 characters long.
3) We have new instances in our environment which have 9 character strings.
When I use the ipcs -a | grep (a 9 char string) there is no data returned. Unless I am mistaken this is because the ipcs command itself will not detect any search string > 8 characters.

I have tested this out and lo and behold this is an issue. So my question is this:

Q) Is there any way to tweak the command via env settings or ANY other feasible method so that we can get ipcs to detect a search pattern that is longer than 8 characters?

Quote:
Or do you mean a db shutdown/restart? We need clarity. And a decent example.
Again, the database is NOT being shutdown or restarted, it is our application servers which are being shutdown. As far as clarity goes I think the example was pretty clear :

1) ipcs -a | grep 1245678 - DOES return a set of results as the 8 char limit isnt breached.

2) ipcs -a | grep 123456789 - DOES NOT return a set of results with this 9 char search string, I am trying to find a way to get the ipcs command to detect something longer than 8 chars in its search string.

Again, I understand the ipcs command stems for a library within Solaris itself. So I am not going to get into re-writing any part of code and recompiling the kernel,etc.

Rather I am curious to see if anyone else has run into this limitation and how they have worked around it?

Thanks! All positive answers and your time are much appreciated.
# 4  
Hello,

Just wanted to follow up and clarify this post a bit, I apologize for any confusion caused.

The output from the ipcs command that I am concerned with is the "CREATOR" column. I am using the -a flag . The issue is that newer app servers are named with a 9 name character set. And from what I can tell the max char is 8 for the CREATOR group with the ipcs command.
So my question refined would be , "Is there any way to get ipcs to increase the limit for the CREATOR column from the ipcs command when using on Solaris 10?"

I hope this helps .

Sample:

T ID KEY MODE OWNER GROUP CREATOR CGROUP CBYTES QNUM QBYTES LSPID LRPID STIME RTIME CTIME
Message Queues:
q 989856285 0 --rw-rw---- xgudprda psa xgudprda psa 0 0 65536 27230 4625 11:51:33 11:51:33 0:20:47

In this case the CREATOR is listed as "xgudprda" which is an 8 char string. The crux of my question is can we get this output to default to 9 characters or anything greater than 8 chars?


Thanks again, I appreciate your time.
# 5  
Quote:
Originally Posted by icalderus
When I use the ipcs -a | grep (a 9 char string) there is no data returned. Unless I am mistaken this is because the ipcs command itself will not detect any search string > 8 characters.
ipcs doesn't have the magic ability to know when something on the other side of the pipe is grepping for 9 characters or more. Maybe it's not printing more than 8 characters in the first place, but it's not the searching that's screwing it up. It may also be a problem with the search string itself.

Post the raw output from ipcs, and post the string that somehow fails to match, and maybe we'll see why grep isn't matching it.
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