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IDS Forum

Re: Outrageous Extent sizes

Date: Thursday, 24 August 2017, at 12:01 p.m.

In Response To: Re: Outrageous Extent sizes (Art Kagel)

Thanks Art. That helps explain part of the issue -- especially with the larger table. 976.5 MB *2 = 1.90 GB.

However, the smaller table still makes no sense. And now I have evidence of another table having the same issue.

Table C: 4.3 GB needing another extent. NEXT size is 2.5 MB.

According to the document, the NEXT size should be doubled, up to 128KB, and once there, doubled only when "the remaining space in the table is less than 10% of the total allocated space in the table".

So the NEXT extent should be 5 MB, right? Well then, why is the new extent **640 MB**? That is 15% of the table size.

Is Informix continuing to double the NEXT size until it crosses the 10% threshold before actually allocating the extent?

That would actually explain the behavior for Table A as well (1.25GB is 13% of 9.5GB)

The documentation is definitely not clear on this. (Not to mention the potentially wasted Free space for tables that may be front-loaded with data, but barely grow in the future.)


On Thu, Aug 24, 2017 at 9:17 AM, Art Kagel <> wrote:
Informix used to double the NEXT SIZE setting for a table/partition after
the allocation of every 16th extent. At some point they changed that to a
more aggressive algorithm:

- Each extent doubles the NEXT SIZE until the table's total alocation

reaches 128KB or more, at that point:

- NEXT SIZE doubles before the current space completely fills whenever

the free space within the existing allocated space becomes less than 10%


See this link:

That's probably what's happening.


Art S. Kagel, President and Principal Consultant
ASK Database Management


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

On Thu, Aug 24, 2017 at 11:00 AM, MICHAEL HOFFMAN <> wrote:

> Hi All,
> Yesterday, I added a 5GB chunk to a 76GB dbspace. The dbspace usually uses
> 5GB
> in about a year.
> This morning, I received warnings that the dbspace was nearly full, and
> when I
> checked, the *entire* dbspace had been allocated -- 0 bytes free. 5 GB in
> DAY!
> Using Server Studio, I discovered that 5 tables had eaten up all the space.
> This made no sense to me, since only one of these tables is a heavy hitter.
> For example:
> Table A was allocated 1.25 GB. The table was 9.5 GB before the additional
> space, and has Next Extent set to 2.5 MB, with a total of 286 extents
> (yes, we
> should fix that at some point).
> Table B was allocated 1.91 GB. The table was 15 GB before the additional
> space, and has Next Extent set to 976.5 MB MB, with a total of 188 extents.
> After 'table shrink', Table A now has an extent on the new chunk of 30.4
> MB!
> Table B also dropped to 35 MB --- but almost immediately was extended back
> out
> to 1.91 GB.
> (Table A did not get resized back up to 1.25 GB, holding steady at 30.4 MB)
> Anyone have an idea as to why Informix is ignoring the Next Extent size
> parameter, and how it is deciding to size these new extents on its own?
> If Informix is just running rampant on its own, how can we as DBAs make any
> accurate predictions on space allocation and best use of fragmentation and
> dbspaces?
> Thanks,
> Michael Hoffman
> ************************************************************
> *******************
> Forum Note: Use "Reply" to post a response in the discussion forum.

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