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IDS Forum

AW: AW: AW: Analysis of activities during chec....

Posted By: Andreas.KUTSCHE@spar.at
Date: Friday, 4 July 2008, at 3:54 a.m.

In Response To: Re: AW: AW: Analysis of activities during checkpoi (VARTIKA AGRAWAL)

Hi,

I think that a recreation of the indices could solve the problem - if possible you should do that.
Index drop/creation in IDS9 needs an exclusive lock of the table - therefore
you need an application downtime (or at least some 'quiet' times).

How big is your table (oncheck -pt <db>:<table>) ? For index creation you should set the environment variables PDQPRIORITY, PSORT_NPROCS and
change the IDS parameters MAX_PDQPRIORITY , DS_TOTAL_MEMORY with onmode .

You can have a look at SAP Note 85067 !

It would be a good idea to test index recreation on a test system to get
some idea about runtimes required.
The update statistics after the index recreation might take more time
than the index creation itself.

If you don't want (or can't) recreate the indices you might try to
lower the threshold of the BTREESCANNER configuration (onmode -C) - perhaps
your problematic indexes don't get cleaned.

As I can see from your onconfig the database supports a SAP system - which
table is affected and which type of SAP system do you run?

Did you change the number of NUMAIOVPS ? Did that have an impact on performance? I would be interested in one sample output of onstat -g iov .

Regards,
Andreas Kutsche

>
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-------------------------------------------
-----Ursprüngliche Nachricht-----

> Von: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Im Auftrag von
> VARTIKA AGRAWAL
> Gesendet: Freitag, 04. Juli 2008 08:37
> An: ids@iiug.org
> Betreff: Re: AW: AW: Analysis of activities during chec.... [12577]
>
> Hi Andreas,
>
> It seems that the INSERT operation is the reason for long chkpnt. But this
> is
> happening only for a particular category of location. It goes thru for all
> other loactions (withing fractions) and stuck up only for one.
>
> I simulated two diff jobs at the same time and one went thru but other
> one(
> the culprit loc) again took very long to finish. Both loc have got almost
> equal no count in the table.
>
> The under lying table is fragmented in 8 dbspaces using round-robin having
> 9
> detached indices and 6 index are larger than the table fragment size.
>
> onstat -g iov always gives io/wup between 0.8 to 1.2.
>
> What may be going wrong and where ?
>
> Thanking you all.
> vartika.
>
>
> **************************************************************************
> *****
> Forum Note: Use "Reply" to post a response in the discussion forum.

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