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IDS Forum

RE: RFE request for session details during vir....

Posted By: Alexandre Marini
Date: Tuesday, 2 December 2014, at 5:53 a.m.

In Response To: Re: RFE request for session details during vir.... (Fernando Nunes)

Hello, Art and Fernando.
Fernando we are aware of this situation, but as Art said, it's exactly what we want to know. Some detail about which session demanded an additional virtual shm segment allocation would be a very nice starting point to investigate further a specific session/program, from the specific time it happened. In most cases this is happening when we are out of work hours, and it is not some cron job, so it became a very annoying situation to debug. Even sqltrace would be hard for us to use, since it is a production box, and we cannot let it running for so long (limited resources, GE version, etc).

If you can find some utils for us, or some event code for alarmprogram customization logging this (even in a separate file), it would be very nice.

Thanks, anyway.
Regards.

Alexandre Marini
IBM Informix Certified Professional v10 / v11.50 / v11.70 / v12.10

IBM Information Management Informix Technical Professional

IBM Certified Developer - Informix Genero
BRIUG website administrator
Informix independent consultant

> To: ids@iiug.org
> From: domusonline@gmail.com
> Subject: Re: RFE request for session details during vir.... [34244]
> Date: Mon, 1 Dec 2014 17:05:15 -0500
>
> I'll have to check. I have customers where I have implemented an alert
> whenever a shared memory segment is allocated. But I'm not sure if I did
> this using the alert mechanism or a script that monitors the online.log
>
> On Mon, Dec 1, 2014 at 7:53 PM, Art Kagel <art.kagel@gmail.com> wrote:
>
> > Fernando:
> >
> > A useful way to handle this would be to add an alert/alarm event for shared
> > memory allocation then we could trap is if needed and do whatever makes
> > sense for the particular installation. Currently we can only catch
> > out-of-memory conditions when it is too late.
> >
> > Art
> >
> > Art S. Kagel, President and Principal Consultant
> > ASK Database Management
> > www.askdbmgt.com
> >
> > Blog: http://informix-myview.blogspot.com/
> >
> > Disclaimer: Please keep in mind that my own opinions are my own opinions
> > and do not reflect on the IIUG, nor any other organization with which I am
> > associated either explicitly, implicitly, or by inference. Neither do
> > those opinions reflect those of other individuals affiliated with any
> > entity with which I am affiliated nor those of the entities themselves.
> >
> > On Mon, Dec 1, 2014 at 1:40 PM, Fernando Nunes <domusonline@gmail.com>
> > wrote:
> >
> > > I'm not sure if I completely understand the request. But apparently you
> > > want the SID of the session that caused the new memory segment to be
> > added.
> > > But this does not necessarily means that that session is the one
> > consuming
> > > more memory. Specially in an high activity system. Let's assume SID= y is
> > > doing something nasty and it consumes a lot of memory. At time T0 it
> > > allocates a large chunk of memory for a sort or whatever. Between T0 and
> > T1
> > > a lot of other sessions allocate small ammounts of blocks. At T1 a
> > > different session (SID=y) needs some memory that isn't available, and
> > that
> > > triggers a new segment allocation. You'd get SID=y and not SID=x in the
> > > messge.
> > >
> > > Beside that, systems can now allocate memory in pro-active mode (meaning
> > no
> > > SID is associated with it).
> > >
> > > What I think you need is an expedite way of showing which sessions are
> > > consuming more memory at a specific time (onstat -u is limmited for that,
> > > and I do agree some other option would be interesting). Once you have a
> > way
> > > to do that (and we can create a script to do what you mention) you just
> > > have to call it in the ALARMPROGRAM script when the event is the one
> > you're
> > > looking for...
> > >
> > > Regards
> > >
> > > On Mon, Dec 1, 2014 at 5:32 PM, Alexandre Marini <alexandre@briug.org>
> > > wrote:
> > >
> > > > Hello.
> > > > I think this might be a very useful RFE, in order to help us to
> > identify
> > > > abnormal memory session usage, in OLTP systems of high ammount of
> > > > concurrent
> > > > sessions (ad-hoc applications).
> > > >
> > > > If anyone like, please vote it...
> > > >
> > >
> > https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=62730
> > > >
> > > > Regards.
> > > >
> > > > Alexandre Marini
> > > > IBM Informix Certified Professional v10 / v11.50 / v11.70 / v12.10
> > > >
> > > > IBM Information Management Informix Technical Professional
> > > >
> > > > IBM Certified Developer - Informix Genero
> > > > BRIUG website administrator
> > > > Informix independent consultant
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> *******************************************************************************
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > > >
> > >
> > > --
> > > Fernando Nunes
> > > Portugal
> > >
> > > http://informix-technology.blogspot.com
> > > My email works... but I don't check it frequently...
> > >
> > > --001a113fd708c081b205092beeb0
> > >
> > >
> > >
> > >
> >
> >
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --089e01419d862a606505092cf5fc
> >
> >
> >
> >
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
> --001a1140f88eb070e005092ecde4
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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