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IDS Forum

Re: out of virtual shared memory

Posted By: Fernando Nunes
Date: Thursday, 23 December 2010, at 7:31 p.m.

In Response To: out of virtual shared memory (KAMRAN HAQ)

On Thu, Dec 23, 2010 at 9:45 PM, KAMRAN HAQ <> wrote:

> We are running IDS 11.5FC6 on Solaris. Today memory consumption started
> increasing on our production database and within few minutes it reached the
> shmmax limit. We found message in online log
> "out of virtual shared memory", so we restarted the database instance.
> There were a lot of sessions in lock-wait state. We did not found the
> culprit
> session.
> Can we set alarmprogram to log the information on event when a memory
> segment
> is requested/added to IDS instance.
> What could be the possible reasons of rapid memory consumption while
> instance
> in running in stable state for a long time.
> What are the events in for "memory segment request" and
> "further lock allocation requests".
> Thanks and regards,
> Kamran
shared memory allocation + lots of sessions in lock wait ~= increase in
number of locks.
"~=" is my way of writing "usually equals"....

You should check that if you gathered some info... But if it happened you
should see messages in the online log saying that the lock table is being

Locks in recent versions, contrary to older ones tend to consume a
reasonable large number of bytes (I believe the manual states around 100 and
it used to be 4 in old versions). What this means is that the lock table
increase can have a significant impact on memory allocations.

And If I'm allowed to say this in public, IBM keeps insensitive to the fact
that we don't have a per session limit of locks.... (I've already said it in
private more than once). I believe this is a "small" feature with a large
(positive) impact on customers.... Maybe customers out there can raise your
voice if you agree with me.

Regarding the alarmprogram, I can't give you a definitive answer but I
believe the alarmprogram is not called when a new shared memory segment is

Having said this, let me share an email I received a couple of days ago:

----------------------- start here
This is an automatic generated mail created by the script of the
Informix instance XPTO at host XPTO_HOST

Date: Tue Dec 21 12:58:36 PWT 2010
Severity: 3
Class Id: 905
Class desc: Dynamically allocated new memory segment

Class msg: Dynamically allocated new memory segment

Specific msg: 12/21/10 12:58:31 Dynamically allocated new virtual shared
memory segment (size 262144KB)

Aditional information:

-------------------- Ends

The class ID (905) is not a standard one. I have a script that monitors the
online.log, checks each new line against a configuration script (which
includes a string to do the match, a severity and a custom class id) and
then if it matches calls the alarm program with the appropriate arguments.

So, assuming it does not call automatically, there's a way to do it. I can
give more details, or share the script if needed.

In any case, verify the information you collected and see if any session had
a large number of locks.

Fernando Nunes
My email works... but I don't check it frequently...


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