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IDS Forum

Re: Informix Dynamic Server w/ AD Version 8.21....

Posted By: Art Kagel
Date: Thursday, 12 February 2009, at 1:59 p.m.

In Response To: RE: Informix Dynamic Server w/ AD Version 8.21.... (LARRY SORENSEN)

As for the tablespace tablespace itself, assume the absolute maximum since
there are no indexes and no real columns. The data stored there IS
accessible. It's represented by several SMI tables in sysmaster:
systabnames, sysptnhdr, sysextents, syskeycols(? not sure of that one, no
server handy right now) which display various parts of the partition's basic
information.

So, on a 4K page the max would be something like:

extspace = 4096 - (136 + 4 + 0 + 0 + 84) = 3872
max extents = 3872/8 = 484

FYI, the partition page for the tablespace tablespace is there in those SMI
tables. It's the second partition (so the second smallest partnum) in the
rootdb space (the first is the database tablespace (or partition) that holds
the list of databases on the server - shown in sysdatabases). The partnum
is something like 0x00100002 in hex.

Art

On Thu, Feb 12, 2009 at 1:36 PM, LARRY SORENSEN <lsorensen25@msn.com> wrote:

> Art,
>
> I appreciate your responses. One last thing, hopefully. There is a formula
> that the reference manual lists to calculate the maximum number of extents
> for
> a table. I did not understand it very well. Is there anyway that you could
> explain it to me? Since I don't have access to the TBLSpace table, I am not
> sure of columns, indexes, etc. When running 'onutil CHECK RESERVED' it does
> not show the result other than to say it was checked. The filesystem page
> size
> is 4k.
>
> To calculate the upper limit on extents for a particular table, use the
> following
> set of formulas:
> vcspace = 8 *vcolumns + 136
> tcspace = 4 *tcolumns
> ixspace = 12 *indexes
> ixparts = 4 *icolumns
> extspace = pagesize –(vcspace + tcspace + ixspace + ixparts + 84)
> maxextents = extspace/8
> The table can have no more than maxextents extents.
>
> vcolumns is the number of columns that contain blob and VARCHAR
> data.
> tcolumns is the number of columns in the table.
> indexes is the number of indexes on the table.
> icolumns is the number of columns named in those indexes.
> pagesize is the size of a page reported by onutil CHECK RESERVED.
>
> > To: ids@iiug.org
> > From: art.kagel@gmail.com
> > Subject: Re: Informix Dynamic Server w/ AD Version 8.21.... [14871]
> > Date: Thu, 12 Feb 2009 12:14:03 -0500
> >
> > It doesn't appear anywhere. It is a total internal table and you cannot
> set
> > the next size for it (nor for normal system tables either).
> >
> > Art
> >
> > On Thu, Feb 12, 2009 at 11:13 AM, LARRY SORENSEN <lsorensen25@msn.com
> >wrote:
> >
> > > Art,
> > >
> > > Also, I can't find the TBLSpace table in either the sysmaster or the
> user
> > > database. Where is that located and can I set the next extent for now?
> > >
> > > > To: ids@iiug.org
> > > > From: art.kagel@gmail.com
> > > > Subject: Re: Informix Dynamic Server w/ AD Version 8.21.... [14852]
> > > > Date: Wed, 11 Feb 2009 20:30:58 -0500
> > > >
> > > > The user tables you can reorg by exporting their data, truncating the
> > > table,
> > > > and reloading the data - or create a new table, copy the data from
> the
> > > old
> > > > table to the new one, rename both tables, drop the old one. The
> 'system'
> > > > table is actually the set of tablespace pages or each table's header
> page
> > > > for the entire server. The only way to reorg the tablespace
> tablespace
> is
> > > > to unload all databases, reinitialize the engine, reinitialize all
> > > dbspaces,
> > > > recreate and reload all databases. Not pretty.
> > > >
> > > > Art
> > > >
> > > > On Wed, Feb 11, 2009 at 4:58 PM, LARRY SORENSEN <lsorensen25@msn.com
> >
> > > wrote:
> > > >
> > > > > Here are the extents on the tables in question:
> > > > >
> > > > > Extents Table
> > > > >
> > > > > ------- --------
> > > > >
> > > > > 446.0 TBLSpace
> > > > >
> > > > > 412.0 agg_grp
> > > > >
> > > > > 305.0 sales_wkly
> > > > > We are running AIX 4.3 with a 4k page size. I am not quite as
> familiar
> > > with
> > > > > XPS as I am with IDS. I will assume that I am getting close to the
> > > extent
> > > > > limit on those 3 tables. What are my options. As you can see, one
> of
> > > the
> > > > > tables is a system table and the other 2 are user tables. With the
> 2
> > > user
> > > > > tables, can you just do like in IDS and unload, drop/recreate,
> reload
> > > the
> > > > > tables? What are my options instead. On the system table, I am not
> sure
> > > > > what
> > > > > to do. I can use as much information as possible.
> > > > > Larry
> > > > >
> > > > > > To: ids@iiug.org
> > > > > > From: miller3@us.ibm.com
> > > > > > Subject: RE: Informix Dynamic Server w/ AD Version 8.21....
> [14811]
> > > > > > Date: Mon, 9 Feb 2009 18:19:49 -0500
> > > > > >
> > > > > > Larry:
> > > > > >
> > > > > > Your XPS system is probably using a pagesize of 4KB (or higher).
> Most
> > > XPS
> > > > > > system have a base page size of 4KB. The base page size of an XPS
> > > system
> > > > > > maybe specified when you init the system the first time.
> > > > > >
> > > > > > Most of the manual calculation assume a 2KB pages size..
> > > > > >
> > > > > > John F. Miller III
> > > > > > STSM, Support Architect
> > > > > > miller3@us.ibm.com
> > > > > > 503-578-5645
> > > > > > IBM Informix Dynamic Server (IDS)
> > > > > >
> > > > > > ids-bounces@iiug.org wrote on 02/09/2009 02:22:21 PM:
> > > > > >
> > > > > > > I have an instance of IDS 8.21. When looking up information on
> > > maximum
> > > > > > > extents, it lists something low in the 200's maximum for the
> number
> > > > > > > of extents
> > > > > > > that a table can have. I have a couple of tables with over 400
> > > > > > > extents and one
> > > > > > > over 300. I have not seen any problems yet, but according to
> the
> > > > > > > documentation
> > > > > > > that I have read, the database should have complained a long
> time
> > > ago.
> > > > > > Does
> > > > > > > anyone of any current information on this as to why the
> database
> > > has
> > > > > not
> > > > > > > complained and on what I can expect for max extents?
> > > > > > >
> > > > > > > Larry
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
>
> *******************************************************************************
> > > > > >
> > > > > > > Forum Note: Use "Reply" to post a response in the discussion
> forum.
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
>
> *******************************************************************************
> > > > > > Forum Note: Use "Reply" to post a response in the discussion
> forum.
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
>
> *******************************************************************************
> > > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > > >
> > > > >
> > > >
> > > > --
> > > > 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.
> > > >
> > > > --0016e64e9c0eebe04c0462aeabe2
> > > >
> > > >
> > > >
> > >
> > >
> >
>
> *******************************************************************************
> > > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > > >
> > >
> > >
> > >
> > >
> >
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --
> > 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.
> >
> > --001485f91dd267cc4d0462bbd844
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
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.

--0016e64135bc95c76c0462bd5247

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