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IDS Forum

Re: Outrageous Extent sizes

Posted By: david@smooth1.co.uk
Date: Monday, 2 October 2017, at 2:47 p.m.

In Response To: Re: Outrageous Extent sizes (MICHAEL HOFFMAN)

Hi,

Try

oncheck -cc

I would expect this to complain, it did in earlier releases.

If someone manually updates systables (which is NOT supported) then this can happen but it is flagged by oncheck.

Regards,
David.

> On 02 October 2017 at 19:34 MICHAEL HOFFMAN <offdisc@gmail.com> wrote:
>
>
> Hi All,
> To wrap up this topic:
> After working with HCL, we discovered a mismatch between the Next Size value
> in dbschema (and appropriately, in systables) versus 'oncheck -pT' (and thus
> sysmaster:sysptnhdr).
> As the Next Size is automatically doubled, the new value is stored in
> sysptnhdr, but not reflected in systables; therefore, the DBA has no idea that
> the doubling has occurred.
>
> IBM, of course, claims this is an "as designed feature". Hmmm... similar data
> in two different tables that don't sync? Sounds like a BUG to me.
>
> Best bet: create a script that monitors sysptnhdr against systables.
>
> Result: we did discover that "alter table .. modify next size..." will in fact
> reset the sysptnhdr value to the requested size. The doubling counter will
> restart, so constant monitoring is still necessary, but at least the extents
> will be sized as the DBA requested them to be.
>
> Thanks,
> Michael Hoffman
>
> In Response To: Re: Outrageous Extent sizes (Art Kagel)
>
> Art & David,
> Seeing as the issue really pertains to slowly-growing large tables, is there a
> way to turn OFF Extent Size doubling? Either on the database or table level?
> I'd even take instance level.
>
> As David points out, if I am doing my DBA job, I have already done due
> diligence and worked out how fast my tables grow, and what the appropriate
> NEXT size should be based on that growth.
>
> There should be a way to force Informix to acknowledge that work, to
> acknowledge that maybe the DBA knows their data patterns better than IBM does.
>
> Thanks,
> Michael
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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