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IDS Forum

Re: No more pages in a tablespace

Posted By: Art Kagel
Date: Tuesday, 24 April 2012, at 5:27 a.m.

In Response To: RE: No more pages in a tablespace (LARRY SORENSEN)

OK, when you create an index on a fragmented table and do not specify an IN
clause or fragmentation scheme then the index is fragmented the same way as
the table it describes. However, you have fragmented the table using round
robin fragmentation and you cannot fragment an index round robin because
there would be no way to find a given index key except by scanning all
fragments of the index and that's just too inefficient, so Informix said
"No." when you asked it to do that. If you fragment the index by the key
column, or part of it, or use an IN clause to place the index unfragmented
into a single dbspace, that will be OK.

On your second question, you altered the table's storage from
non-fragmented to round-robin fragmentation. Round robin means that new
rows added to the table will be assigned to each of the fragments in a
round robin fashion. This does not require that existing rows be
redistributed so the existing rows were just dumped into one fragment and
so you still had more than 16million pages in that one fragment. If you
had fragmented by some expression on sets of values in a column (say all
rows with the serial column's value between 1 and 2000000 in the first
fragment, between 2000001 and 4000000 in the second fragment, etc, that
would have forced the rows to be redistributed across the <N> fragments and
all would have been well. Your solution, to unload the table, create the
table empty but fragmented round robin, then reload the rows accomplished
the same thing since the inserts were distributed round robin across the
fragments.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on my employer, Advanced DataTools, 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 Mon, Apr 23, 2012 at 9:04 AM, LARRY SORENSEN <lsorensen25@msn.com> wrote:

> Thank you all for your help with this issue. I have one more question, and
> I
> will also post my experience.
>
> 1) I fragmented the table as well as moved it into a new dbspace with a
> larger
> page size. When I tried to create the unique index on a column, as it was
> prior, I received an error message to the affect that it was not possible
> on a
> fragmented table. I ended up creating a normal index; however, I would
> prefer
> to have the unique constraint. Any ideas or comments?
>
> Experience
>
> First, I created a separate dbspace where I added 30+ GB of logical logs.
> I then performed an "ALTER FRAGMENT ON TABLE ..... INIT PARTITION BY ROUND
> ROBIN
>
> PARTITION part1 in dbspace1,
>
> PARTITION part2 in dbspace1....etc
>
> That ran for quite a while to completion. I never saw any rollback of the
> transaction; however, when it was done, I noticed the same error message in
> the online.log file stating that there were no more pages at about the time
> the ALTER statement finished. I performed an oncheck -pt on the table and
> it
> was the same.
>
> I then resorted to unloading the entire table, which took a long time,
> creating a new dbspace with a larger page size, creating an new table,
> ALTER
> FRAGMENT on the new table; and then I loaded the new table. That worked
> fine,
> but I wonder why the first try, without the unload, didn't work.
>
> Larry
>
> > To: ids@iiug.org
> > From: art.kagel@gmail.com
> > Subject: Re: No more pages in a tablespace [26792]
> > Date: Fri, 20 Apr 2012 18:18:46 -0400
> >
> > 1. Add lots more logical logs, sufficient to hold the whole transaction
> >
> > plus all of the other activity on the server during the reorg run - or -
> >
> > 2. ALTER TABLE <tablename> TYPE (raw); ALTER FRAGMENT...INIT...; ALTER
> >
> > TABLE <tablename> TYPE (standard);
> >
> > Art
> > Art S. Kagel
> > Advanced DataTools (www.advancedatatools.com)
> > Blog: http://informix-myview.blogspot.com/
> >
> > Disclaimer: Please keep in mind that my own opinions are my own opinions
> > and do not reflect on my employer, Advanced DataTools, 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 Fri, Apr 20, 2012 at 4:20 PM, Larry Sorensen <lsorensen25@msn.com>
> wrote:
> >
> > > OK. So I just ran into a long transaction. What are my options now to
> get
> > > this done?
> > >
> > > -----Original Message-----
> > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> Art
> > > Kagel
> > > Sent: Friday, April 20, 2012 1:15 PM
> > > To: ids@iiug.org
> > > Subject: Re: No more pages in a tablespace [26781]
> > >
> > > Either fragment the table (ALTER FRAGMENT FOR <tablename> INIT FRAGMENT
> > > ......) or move the table to a dbspace with wider pages so that more
> rows
> > > fit
> > > on a page - so fewer pages. Choose a page size to minimize wasted
> space on
> > > the pages. That would just be ALTER FRAGMENT FOR <tablename> INIT IN
> <new
> > > dbspace>;
> > >
> > > Art
> > >
> > > Art S. Kagel
> > > Advanced DataTools (www.advancedatatools.com)
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > Disclaimer: Please keep in mind that my own opinions are my own
> opinions
> > > and
> > > do not reflect on my employer, Advanced DataTools, 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 Fri, Apr 20, 2012 at 10:12 AM, LARRY SORENSEN <lsorensen25@msn.com
> > > >wrote:
> > >
> > > > OK. So, now that I have reached that limit, what are the steps that I
> > > > need to go through to fragment that production table?
> > > > > To: ids@iiug.org
> > > > > From: paul@oninit.com
> > > > > Subject: RE: No more pages in a tablespace [26767]
> > > > > Date: Fri, 20 Apr 2012 10:11:18 -0400
> > > > >
> > > > > Still a hard limit AFAIK
> > > > >
> > > > > Cheers
> > > > > Paul
> > > > >
> > > > > -----Original Message-----
> > > > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf
> > > > > Of
> > > > Larry
> > > > > Sorensen
> > > > > Sent: Friday, April 20, 2012 9:09 AM
> > > > > To: ids@iiug.org
> > > > > Subject: RE: No more pages in a tablespace [26766]
> > > > >
> > > > > I am running IDS 11.50.FC5 on Solaris 10
> > > > >
> > > > > I am receiving the error
> > > > >
> > > > > 08:05:20 Process exited with return code 1: /bin/sh /bin/sh -c
> > > > > /opt/informix/production/etc/log_full.sh 3 46 "part ition
> > > > > 'dle_gen:informix.eclaim_h_hist': no more pages" "" ""
> > > > >
> > > > > oncheck -pt shows the following:
> > > > >
> > > > > > oncheck -pt dle_gen:informix.eclaim_h_history
> > > > >
> > > > > TBLspace Report for dle_gen:informix.eclaim_h_hist
> > > > >
> > > > > Physical Address 13:2368379
> > > > >
> > > > > Creation date 10/18/2009 03:16:04
> > > > >
> > > > > TBLspace Flags 800902 Row Locking
> > > > >
> > > > > TBLspace contains VARCHARS
> > > > >
> > > > > TBLspace use 4 bit bit-maps
> > > > >
> > > > > Maximum row size 1491
> > > > >
> > > > > Number of special columns 4
> > > > >
> > > > > Number of keys 7
> > > > >
> > > > > Number of extents 85
> > > > >
> > > > > Current serial value 16342518
> > > > >
> > > > > Current SERIAL8 value 1
> > > > >
> > > > > Current BIGSERIAL value 1
> > > > >
> > > > > Current REFID value 1
> > > > >
> > > > > Pagesize (k) 2
> > > > >
> > > > > First extent size 8
> > > > >
> > > > > Next extent size 524288
> > > > >
> > > > > Number of pages allocated 16777215
> > > > >
> > > > > Number of pages used 16777215
> > > > >
> > > > > Number of data pages 16281308
> > > > >
> > > > > Number of rows 16281308
> > > > >
> > > > > I saw a previous post by Art stating that a single fragment of a
> > > > > table cannot have more than 16 million pages. It appears that we
> may
> > > > > have
> > > > reached
> > > > > that limit. Is that still the case for IDS 11.50? I couldn't find a
> > > > version
> > > > > in the previous post.
> > > > >
> > > > > Also, if that is the case, what is the detailed process for
> > > > > fragmenting
> > > > this
> > > > >
> > > > > table?
> > > > >
> > > > > 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.
> > > >
> > > >
> > >
> > > --e89a8f3ba75f2a4c5a04be211cd6
> > >
> > >
> > >
>
> ****************************************************************************
> > > ***
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> > >
> > >
> >
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --14dae9340c01a4e45304be23ab0b
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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