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IDS Forum

Re: Adding BLOB Chunks to DBSpaces

Posted By: Art Kagel
Date: Wednesday, 13 May 2009, at 4:02 p.m.

In Response To: Re: Adding BLOB Chunks to DBSpaces (DAMIAN PECNIK)

OK, I begin to understand your confusion. In your instance, it looks like
someone set up separate dbspaces for the logical logs and for the physical
log. This is not a bad thing, indeed it is a common recommendation and
required for performance on a busy server if those dbspaces can be placed
onto separate structures utilizing separate IO channels from the data
dbspaces (or even from each other).

However, unless someone has located data tables in those dbspaces along with
the logical logs and physical logs, the physical log certainly will not
expand unless you manually use onparams to increase its size. Similarly,
unless you manually add new logical logs to the existing set of logs - or if
you have the instance configured to automatically add a logical log if all
of the current logs are full (a rarely used option BTW) - then neither will
the logical logs expand beyond the space they are currently using. You have
no fears for those dbspaces and there are many sites that operate with their
logical and/or physical log dbspaces 100% full. No worries.

The graphbbs blobspace on the other hand may actually need more space added
to it, but you will have to determine that based on your current and future
usage. If you have been keeping a history of how the free space in that
dbspace has been drawn down over time you can estimate how much longer the
free space that is there will last and plan accordingly. You should be
tracking dbspace usage over time (as with many other telltales and metrics)
so that you can plot them and compare them over time to understand the
health of your server. Tools like AGS's Server Studio with Sentinel and
(once you upgrade to 11.50) IBM's Open Admin Tool (OAT) can help you do
that. OAT only works with IDS 11, not 9.40 (which by the way is out of
support as of last month - you should upgrade while it is cheap - IBM has
offered to upgrade anyone from any earlier version to IDS 11.50 for the
price of a year's support only!) Server Studio does support IDS 9.40 (and
all other version IB) and you got a free Basic function license along with
your server when you bought it courtesy of IBM. Also when you enable SS for
the first time, you can get a full feature 30 day trial also for free to see
if the additional features are worth paying for. Contact AGS through their
web site (www.serverstudio.com) for details.

Art

Art S. Kagel
Oninit (www.oninit.com)
IIUG Board of Directors (art@iiug.org)

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Oninit, the IIUG, nor any other organization
with which I am associated either explicitly or implicitly. 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 Wed, May 13, 2009 at 2:59 PM, DAMIAN PECNIK <damian.pecnik@pgnmail.com>wrote:

> Yes I am looking at onstat -d update. Also the script
> /cas/log/chkdbspace.log
> which I think is a GE Picture Perfect thing and not part of informix. Is
> the
> plog something else?
>
> onstat -d update
>
> IBM Informix Dynamic Server Version 9.40.UC3 -- On-Line -- Up 6 days
> 21:36:22
> -- 194024 Kbytes
>
> Dbspaces
> address number flags fchunk nchunks flags owner name
> 17e8f7d8 1 0x20001 1 1 N informix rootdbs
> 1861e7c0 2 0x60001 2 1 N B informix basedbs
> 1861e910 3 0x20001 3 1 N informix llogdbs
> 1861ea60 4 0x20001 4 1 N informix plogdbs
> 1861ebb0 5 0x60001 5 2 N B informix tempdbs
> 1861ed00 6 0x20011 6 2 N B informix imagebbs
> 1861ee50 7 0x20001 7 1 N informix imagedbs
> 18620018 8 0x20001 8 1 N informix graphdbs
> 18620168 9 0x20011 9 1 N B informix graphbbs
> 9 active, 2047 maximum
>
> Waiting for server to update BLOB chunk statistics...
>
> Chunks
> address chunk/dbs offset size free bpages flags pathname
> 17e8f928 1 1 4 100000 94204 PO-- /dev/rrootdbs
> 1861d818 2 2 4 4797952 1113706 PO-B /dev/rbasedbs
> 1861d9a0 3 3 4 500000 235 PO-- /dev/rllogdbs
> 1861db28 4 4 4 16000 947 PO-- /dev/rplogdbs
> 1861dcb0 5 5 4 126000 124797 PO-- /dev/rtempdbs
> 1861de38 6 6 4 600064 0 600064 POB- /dev/rimagebbs
> 1861e018 7 7 4 19456 12299 PO-- /dev/rimagedbs
> 1861e1a0 8 8 0 15360 13780 PO-- /usr/informixdb/graphdbs
> 1861e328 9 9 0 240640 14996 15040 POB- /usr/informixdb/graphbbs
> 1861e4b0 10 6 4 550000 338066 550000 POB- /dev/mapper/rootvg-imagebbs1
> 1861e638 11 5 4 2560000 2559997 PO-B /dev/mapper/rootvg-tempdbs1
> 11 active, 32766 maximum
>
> Expanded chunk capacity mode: enabled
>
> /cas/log/chkdbspace.log
>
> One or more database spaces has exceeded 90% usage on lx000125.
> Please contact your system administrator.
> See below or check /cas/log/chkdbspace.log for the list of database spaces.
>
> 99% llogdbs
> 94% plogdbs
> 93% graphbbs
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--001636c5a6de45e43f0469d0b129

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