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IDS Forum

RE: Re: AW: performance oncheck

Posted By: Lavoie, Diane
Date: Monday, 18 April 2005, at 2:28 p.m.

In Response To: Re: Re: AW: performance oncheck (Jean Sagi)

The best way to test the reorg is to duplicate the database on a similar system (QAS or test system)

This is what I am doing to size the space needs and the elapsed time of the db maintenance.

-----Original Message-----
From: forum.subscriber@iiug.org [mailto:forum.subscriber@iiug.org] On Behalf Of Jean Sagi
Sent: Monday, April 18, 2005 1:27 PM
To: ids@iiug.org
Subject: Re: Re: AW: performance oncheck [4738]

.. to /dev/null ... very good trick !

But how you size (somewhat) the delay it may take to reorganize the table?

An unload to /dev/null will take a lot less time than to a file.

J.

-----Original Message-----
From: "Clifton M. Bean" <cmbean@sbcglobal.net>

You can also perform unloads to /dev/null of your choice of database tables; if there is any data corruption, this will find it. Before performing reorganizations, while planning them, I do this to test for corruption as well as find out (somewhat) the maximum amount of time it may take to reorganize the table.

Take care.
Clifton

"Andreas.KUT...." <andreas.kutsche@spar.at> wrote:
Hi,

I don't know about special performance improvements for oncheck commands.

But I think most people don't run any oncheck command before migrating their servers - at least we don't run these checks before (sometimes because of laziness and sometimes because of DB size).

If you fear to run into problems during the migration I suggest to test the whole process on a recent database copy (restore / disk mirror).
There you can run the onchecks, too. If they don't report errors on your database copy most likely your original won't report any errors, too.

Regards,
Andreas Kutsche


> -----Ursprüngliche Nachricht-----
> Von: forum.subscriber@iiug.org [mailto:forum.subscriber@iiug.org]Im
> Auftrag von WOLFGANG NEUMAR
> Gesendet: Freitag, 15. April 2005 11:15
> An: ids@iiug.org
> Betreff: performance oncheck [4722]
>
>
> Hi,
>
> we are planing a migration from IDS9.30FC3X3 to IDS9.40FC5.
> According to the migration guide, we have to run 2times onchecks.
> The oncheck duration is on the greatest database ( oncheck -cI ) about
> 7hours!
> So my question is, is there a possibility to improve the
> performance/running time of the onchecks?
> for example Configuratin parameters ( PDQ, PSORT_NPROC, number of
> cpu-vps )parallel excution of different onchecks ( oncheck -cD,
> oncheck -cI, oncheck -cc ).
>
> Thanks
> Wolfgang
>
>
>






Jean Sagi
jeansagi@myrealbox.com
jeansagi@yahoo.com



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