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IDS Forum

Re: onstat -l

Posted By: Fernando Nunes
Date: Wednesday, 8 December 2010, at 9:44 p.m.

In Response To: RE: onstat -l (Tristan Ball)

On Thu, Dec 9, 2010 at 2:07 AM, Tristan Ball <tristanb@pronto.com.au> wrote:

> Hi Fernando.
>
> I intend to raise a PMR, I just wanted to check with the general community
> as
> to whether this was a common scenario, and to try and understand what the
> possible impacts might be.
>
> You're right, we only get L-1 through L-3, not sure where I pulled L-4
> from.
> We're not using either SDR or HDR in this instance, it's just a single
> standalone server.
>
> This particular environment has about 45 databases under a single Informix
> instance. Of those, one particular DB sees about 90%+ of the traffic,
> because
> the application uses it for amount other things, scratch storage. We could
> also accept the data loss of using buffered logging on that database only,
> on
> the grounds that I think we would end up rotating the logical log buffers
> much
> less frequently, and if these waits are actually a problem, that may
> alleviate
> it.
>
> Onstat -u doesn't ever seem to show G in the flags, so perhaps this isn't
> actually a problem?
>

If you don't get G flags, it's probably not an issue. And for the G flags to
appear, you'd probably have all 3 logical log buffers in the output.
If you have only 1 or 2, you still have 2 or 1 to go on....
This is one of the cases where onstat "rate" is not enough... a system will
probably change logical log buffers many times while you display a single
onstat interaction.
I've seen slowness due to G flags occasionally, but on that situations I've
always noticed G flags a lot. (each onstat -u brings a lot of sessions with
G flag, constantly)
Regards.

Regards.

>
> Thanks for your input.
>
> Regards,
>
> Tristan
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Fernando
> Nunes
> Sent: Thursday, 9 December 2010 10:19 AM
> To: ids@iiug.org
> Subject: Re: onstat -l [22172]
>
> Nice... I started this reply by saying I haven't seen this output either...
> But then I went into the knowledge base...
> You may not believe it, but it's there since version 4.x at least. (tbstat
> -l) :)
> It was about time that someone documents it (assuming it isn't - I didn't
> look
> - )
>
> L-x means the logical buffer... Please confirm if you ever seen L-4, since
> Art
> is right, it should be at most L-3 ioproc should be the thread
> identifier...
> No idea what "0" means. No idea what the flags mean...
>
> Do you have HDR or SDS setup? When you see this output you should also have
> "G" flags on the onstat -u output.
> This can be a serious problem if you have it frequently.
> I believe there is material around this issues (when they are issues, not
> saying that's your case) to write a small book :)
>
> In HDR environments this is one of the reasons why the primary can be
> impacted
> by secondary. We've seen several customer having problems, but too many
> times
> the cause is related to poor configuration or too much load on the
> secondary
> (there was a chat with the labs session that dig into this).
> So, I think there hasn't been enough "pressure" to solve this, and I
> suppose
> there is no decision about the solution. Typically this is seen in
> unbuffered
> logging databases together with high usage systems.
> In unbuffered logging, each commit forces a logical log buffer flush, and
> with
> many sessions this sometimes makes the 3 logical log buffers not enough for
> the rotation needed. A simple solution would be to get more logical log
> buffers, but I believe R&D would prefer a better solution.
>
> Not much help, but if you require documentation on this, please open a PMR
> and
> ask about it (I know customers have other/better things to do, but that's
> the
> quickest way to get it done).
>
> Regards.
>
> On Wed, Dec 8, 2010 at 1:59 AM, Art Kagel <art.kagel@gmail.com> wrote:
>
> > There are three logical log buffers: L-1, L-2, & L-3. The current
> > buffer rotates among these three. While one is being written to disk
> > the next one is used, etc. I don't remember seeing this output, but it
> > may indicate that one or both of the buffers which is not current are
> > waiting to be written out. This can become a problem if the IO
> > subsystem is so slow that all three buffers are full and logical log
> > records must wait to be written to a buffer until one can be flushed
> > and released for reuse. What are the IO service times reported for the
> > logical log chunk(s) in onstat -g iof? If these are high, say over
> > 0.025secs, you may have an IO bottleneck on those chunks.
> >
> > Art
> >
> > Art S. Kagel
> > Advanced DataTools (www.advancedatatools.com) IIUG Board of Directors
> > (art@iiug.org)
> > Blog: http://informix-myview.blogspot.com/
> >
> > Disclaimer: Please keep in mind that my own opinions are my own
> > opinions and do not reflect on my employer, Advanced DataTools, 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 Tue, Dec 7, 2010 at 6:58 PM, Tristan Ball <tristanb@pronto.com.au>
> > wrote:
> >
> > > I'm seeing a couple of extra lines in the output of 'onstat -l',
> > > which I can't find documented in the 11.50 administrators guide and
> > > references.
> > >
> > > The lines in question look like this:
> > >
> > > Buffer Waiting
> > > Buffer ioproc flags
> > > L-1 0 0x1 0
> > > L-2 0 0x1 0
> > >
> > > The exact lines varies (L-1 through to L-4 I think), and sometimes
> > > the entire block simply isn't there.
> > >
> > > My naive assumption is that this probably represents a problem, and
> > > if something is waiting on buffers long enough for it to show in
> > > onstat -l
> > for
> > > several seconds at a time?
> > >
> > > Is anyone familiar with what this actually means?
> > >
> > > Thanks,
> > >
> > > Tristan
> > >
> > >
> > >
> > >
> >
> >
>
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --485b393ab8495e10a10496dc775c
> >
> >
> >
> >
>
>
> *******************************************************************************
> > 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...
>
> --0015174c1102864fb90496ee5968
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>
> *******************************************************************************
> 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...

--000e0cd1fa58841dfe0496f137ae

Messages In This Thread

  • onstat -l
    Tristan Ball -- Tuesday, 7 December 2010, at 6:58 p.m.
    • Re: onstat -l
      Art Kagel -- Tuesday, 7 December 2010, at 8:59 p.m.
      • RE: onstat -l
        Tristan Ball -- Wednesday, 8 December 2010, at 4:41 p.m.
      • Re: onstat -l
        Fernando Nunes -- Wednesday, 8 December 2010, at 6:19 p.m.
        • RE: onstat -l
          Tristan Ball -- Wednesday, 8 December 2010, at 9:07 p.m.
          • Re: onstat -l
            Fernando Nunes -- Wednesday, 8 December 2010, at 9:44 p.m.

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