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IDS Forum

Re: Question on Checkpoint Tuning How To for I....

Posted By: Kern Doe
Date: Friday, 14 December 2012, at 5:24 p.m.

In Response To: Re: Question on Checkpoint Tuning How To for IBM I (Art Kagel)

Thank you very much for the advice Art!!

From: Art Kagel <>
Sent: Friday, December 14, 2012 12:53 PM
Subject: Re: Question on Checkpoint Tuning How To for I.... [29095]

The thing to look at in 11.xx, because we now have non-blocking
checkpoints, is the checkpoint wait times. Run onstat -g ckp when you are
running these load jobs and reporting and see what the max and average wait
times are and how many sessions had to wait. Also look at the frequency
and cause of the checkpoints. If the wait times are significant, your
checkpoints are too frequent, or are being tripped by logical log buffer or
physical log overflow issues, then there are tuning items you can address.

The things you need to tune are mostly the same as in 9.xx except that the
LRUS and LRU_MIN/MAX_DIRTY parameters were replaced by attributes of the
BUFFERPOOL parameter settings and so are settable independently for each
buffer pool. Onstat -R is still the way to monitor lru flush performance
between checkpoints, but now it reports for each buffer pool's lrus list
separately. PHYSFILE is still there but you cannot manually modify it,
you have to use onparams to resize or relocate the physical log - which can
now be done at runtime, you don't have to shutdown the instance. Note that
to resize the physical log you need space for the new log in its target
dbspace and for the existing old log where it resides until the new log
becomes operational. If you are resizing it into the same dbspace and
there isn't room for both lots concurrently, you may have to resize it
twice. Once to a tiny log in another dbspace then again to the new larger
size in the desired dbspace.

You also now have to contend with the AUTO* parameters some of which will
affect checkpoint frequency and duration. Note that in general, warehouse
instances should have very long CKPTINTVL values set since during normal
operations checkpoints are not important and during loads you want as few
checkpoints as possible and will likely force one at the end of the load
manually anyway.


Art S. Kagel
Advanced DataTools (

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 Fri, Dec 14, 2012 at 1:25 PM, Kern Doe <> wrote:

> Hello Informix gurus,
> I got 2 questions relating to checkpoint.
> 1. I've heard long checkpoint is acceptable in a data warehouse
> environment,
> but as far as I'm concerned, it's not so ok, it's been affecting the
> performance. In this environment, we have load jobs going on, then report
> jobs
> at the same time -- with this reason, in my own interpretation, I believe
> checkpoint durations should be tuned down.
> 2. How to tune checkpoint?
> I know in versions, 9 or older, I look at LRU_MIN_DIRTY and LRU_MAX_DIRTY,
> CLEANERS, BUFFER, then PHYSFILE. I can fine tune the checkpoint with
> onstat -R
> and onstat -F
> What do we do differently with newer versions of Informix where related
> onconfig parameters are little bit different now?
> Thanks so much in advance.
> Kern --
> 12/14/12 00:01:37 Checkpoint Completed: duration was 43 seconds.
> 12/14/12 00:01:47 Checkpoint Completed: duration was 9 seconds.
> 12/14/12 00:04:22 Checkpoint Completed: duration was 17 seconds.
> 12/14/12 00:11:14 Checkpoint Completed: duration was 108 seconds.
> 12/14/12 00:14:45 Checkpoint Completed: duration was 45 seconds.
> 12/14/12 00:20:20 Checkpoint Completed: duration was 310 seconds.
> 12/14/12 00:21:52 Checkpoint Completed: duration was 91 seconds.
> 12/14/12 00:22:59 Checkpoint Completed: duration was 66 seconds.
> 12/14/12 00:24:29 Checkpoint Completed: duration was 89 seconds.
> 12/14/12 00:26:43 Checkpoint Completed: duration was 133 seconds.
> 12/14/12 00:28:14 Checkpoint Completed: duration was 90 seconds.
> 12/14/12 00:31:07 Checkpoint Completed: duration was 8 seconds.
> 12/14/12 00:32:00 Checkpoint Completed: duration was 14 seconds.
> 12/14/12 00:32:31 Checkpoint Completed: duration was 8 seconds.
> 12/14/12 00:33:26 Checkpoint Completed: duration was 16 seconds.
> 12/14/12 00:34:52 Checkpoint Completed: duration was 45 seconds.
> 12/14/12 00:35:05 Checkpoint Completed: duration was 12 seconds.
> Forum Note: Use "Reply" to post a response in the discussion forum.


Forum Note: Use "Reply" to post a response in the discussion forum.

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