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IDS Forum

RE: Questions on IDS 11.50 for Database consistenc

Posted By: Alexandre Marini
Date: Wednesday, 9 May 2012, at 8:03 a.m.

In Response To: Questions on IDS 11.50 for Database consistency (Achilleas Achilleos)

Hello.
As far as I know, oncheck was regularly needed only before version 11, so itīs not your case anymore.
Of course you could schedule, letīs say, once a month, a full oncheck, in order to make sure everything is going fine, just as expected.

About update statistics, you didnīt mention your relase (11.50 .....?)
But I can send you some official recommendations:
https://www-304.ibm.com/support/docview.wss?uid=swg21137764

If you want to do it in automatic way, you could:
a. enable AUS - have you tryed OAT web administration? If not, you should do it soon... itīs great.
b. use Mr. Art Kagel dostats utility, packaged in utils2_ak (available in our sw repository).

Obs: there is no problem running update statistics with your engine online, donīt worry.

Hope this helps.
Regards.

Alexandre Marini
IBM Informix Certified Professional v10 / v11.50 / v11.70

IBM Information Management Informix Technical Professional

IBM Infosphere DataStage Technical Professional
Database Administrator
BRIUG website administrator

> To: ids@iiug.org
> From: AchilleasAchilleos@semltd.com.cy
> Subject: Questions on IDS 11.50 for Database consistency [27085]
> Date: Wed, 9 May 2012 00:51:56 -0400
>
> Hello ,
>
> I have a couple of questions concerning "oncheck" and Update statistics .
>
> As far as database consistency and integrity checks are concerned, we
> perform :
>
> ... Onchecks on a weekly basis (oncheck -ccIxD -y <dbname> PLUS
> oncheck -cR and oncheck -ce)
>
> ... Update Statistics For Tables, also on a weekly basis (taking all
> considerations for dropping distributions,LOW,MEDIUM,HIGH).
>
> The questions are:
>
> 1. OnCheck runs while the instance is on-line. Any corruption found,
> it is fixed in this mode "oncheck -ccIxD -y <dbname >" or the instance must
> be in quiescent mode ?
>
> 2. The parameters given in 'oncheck' (-ccIxD -y ) are sufficient ?
> Now, they cover system catalog tables , index and data pages, reserved pages
> and extents. Is there anything else to consider ?
>
> 3. Update Statistics is running ONLY for tables. Should we run it
> for procedures, functions and routines as well ?
>
> 4. If the answer in Q3 is yes, is it ok if we don't specify any
> procedure/function/routine names (that is, execute UPDATE STATISTICS FOR
> PROCEDURE; UPDATE STATISTICS FOR FUNCTION; UPDATE STATISTICS FOR ROUTINE;) ?
> In this way ALL procedures/functions/routines will be checked (both
> application and internal). Does it "harm" internal Informix procedures ?
>
> 5. Will there be a problem if we run UPDATE STATISTICS on the tables
> of a database while somebody is working on that same database ?
>
> Thanks
>
> Description: Description: CoopLogo1Description: Description: CoopLogo1
>
> Cooperative Computer Society (S.E.M) Ltd
>
> 1306 Nicosia
>
> P.O.B. 25037 CY
>
> Tel: +357 22 673 901
>
> Fax: +357 22 672 774
>
> Achilleas Achilleos
>
> Official A
>
> OS and Databases Management
>
> <mailto:AchilleasAchilleos@semltd.com.cy> AchilleasAchilleos@semltd.com.cy
>
> --Boundary_(ID_iVx6MPzEc9A4QmD03J3THg)
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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