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IDS Forum

Re: Analysis of activities during checkpoint.

Posted By: Art Kagel
Date: Wednesday, 2 July 2008, at 8:52 a.m.

In Response To: Analysis of activities during checkpoint. (VARTIKA AGRAWAL)

BTSCANNER does not affect checkpointing at all, it controls the performance
of the Btree Scanner threads which run in the background almost constantly
removing keys marked for deletion and compressing index nodes that have
emptied to keep the indexes efficient.

The ONCONFIG parameters that affect checkpoint duration are:

CKPTINTVL - the time between the end of one checkpoint and the beginning of
the next.

PHYSFILE - the larger the physical log, the more data has to be cleared out
at the end of the checkpoint. Also the physical log can be triggering your
checkpoints if you have CKPTINTVL set too high and PHYSFILE too low.

LRUS - more LRUs will flush more quickly during LRU flush time leaving less
chance that there will be more dirty buffers than LRU_MIN_DIRTY at
checkpoint time.

LRU_MAX_DIRTY - the % of dirty buffers in an LRU queue that triggers an LRU

LRU_MIN_DIRTY - the % of dirty buffers left in an LRU queue when an LRU
write completes.

NUMAIOVPS - if your chunks are COOKED files or devices then AIO VPS are used
to flush dirty buffers to disk, both at LRU flush time and at chunk write
time during a checkpoint. If you chunks are not all RAW devices, then you
need the greater of the number of LRU queues or 1.5 times the number of
COOKED chunks in order for dirty page flushing to be time efficient.

If you are using a few large chunks instead of a larger number of smaller
chunks, you will have only one flush thread per chunk running at checkpoint
time. More chunks means more flush threads means less time to flush.

Finally, how many disk spindles are involved with flushing your chunks? If
it's all going to partitions on a single HUGE spindle or even several
spindles attached to a single controller channel, then you may be hitting
the IO limits of your subsystems. More spindles and/or more controller
channels involved means lower flush times.


On Wed, Jul 2, 2008 at 4:01 AM, VARTIKA AGRAWAL <>

> Hi,
> Env :
> IBM Informix Dynamic Server Version 9.40.FC5XF
> SunOS DB10 5.9 Generic_118558-28 sun4u sparc SUNW,Sun-Fire
> I would like to know the activities being done by IDS when the engine is
> blocked for checkpoint. I know it is basically chunk writes but what else
> other than that? how can i diagnose the long checkpoints?
> btree cleaner/scanner setting is -
> BTSCANNER num=6,priority=high,threshold=600000,rangesize=500.
> In general my checkpoints range between 20-30 sec, but i am observing some
> high figures suddenly. There is no job in critical write section during
> chkpnt.
> Please help me understand.
> vartika.
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.

Art S. Kagel
Oninit (
IIUG Board of Directors (

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Oninit, the IIUG, nor any other organization
with which I am associated either explicitly or implicitly. Neither do those
opinions reflect those of other individuals affiliated with any entity with
which I am affiliated nor those of the entities themselves.

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