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IDS Forum

Re: In Place Alters and Upgrade plans

Posted By: david@smooth1.co.uk
Date: Wednesday, 29 November 2017, at 5:44 p.m.

In Response To: Re: In Place Alters and Upgrade plans (Fernando Nunes)

RFC 113669 submitted for a command to resolve in-place alters including as an online operation.

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=113669

Regards,
David.

> On 29 November 2017 at 22:30 Fernando Nunes <domusonline@gmail.com> wrote:
>
>
> As a side note...
> IPAs are a DBA life saver... Many schema changes are made very quick
> because of them. It's a great feature that I'd love to see improved (by
> removing some exceptions wherever possible).
>
> However, it's also true that over time (decades) some bugs have only
> happened on tables with IPA... Not because an IPA is a bad thing, but
> simply because it makes the code more complex. It's really magical what the
> engine has to do on tables with IPA...
> So, what I'm trying to say is that we can take advantage of the IPAs to do
> really fast DDL changes, and then identify them and slowly trying to remove
> the old version pages by doing some updates. I think someone wrote an
> article about this... basically trying to update a single row in each page
> with an old version. This can be done in backgroud without any downtime...
>
> Regards.
>
> On Wed, Nov 29, 2017 at 11:24 PM, Fernando Nunes <domusonline@gmail.com>
> wrote:
>
> > I have the same idea. The reason to remove the IPAs was to prevent issues
> > if you wanted to rollback the upgrade. To be honest the only time I did
> > reversions was on customer workshops... Never in a real situation.
> > Having said that, the different behaviors between the script (stating you
> > have IPAs) and the other method (showing you have not) is relatively simple
> > and should be explained in the links you mention:
> >
> > The "oncheck -pT" shows if there are any pages (which is the "real" thing)
> > but is painfully slow. The other method (script) would tell you if the
> > table *had* any IPAs.... and that method if fast.
> >
> > What Andreas showed is an attempt to join both things: Getting the correct
> > result, amazingly fast. It was an effort with the collaboration of Art
> > Kagel and Andreas Legner (hope I'm not forgetting someone).
> > It should work. In case it doesn't please return here and explain the
> > issue. I'll do my best to fix it.
> >
> > Regards.
> >
> > On Wed, Nov 29, 2017 at 10:40 PM, Andreas Legner1 <
> > Andreas.Legner1@de.ibm.com> wrote:
> >
> > > AFAIK version 10 eliminated the need for eliminating outstanding in-place
> > > alters.
> > >
> > > If I recall correctly, the problem was not (never was) the upgrade, but a
> > > possible later reversion. Since that v10 change pre-existing outstanding
> > > IPAs, from before an upgrade, would not hinder a later reversion.
> > > Different story, though, for new IPAs (new ALTER TABLEs) introduced after
> > > upgrade.
> > >
> > > In case you just want to be in the know wrt. outstanding IPAs, I'd
> > > recommend
> > > https://github.com/domusonline/InformixScripts/tree/master/queries
> > >
> > > HTH,
> > > Andreas
> > >
> > > From: "MARK COLLINS" <markc@myfastmail.com>
> > > To: ids@iiug.org
> > > Date: 11/29/2017 03:57 PM
> > > Subject: In Place Alters and Upgrade plans [40294]
> > > Sent by: ids-bounces@iiug.org
> > >
> > > IDS 11.50.FC6
> > > HP-UX 11.31 PA-RISC
> > >
> > > As you can see above, we're on 11.50, and needing to upgrade before
> > > end-of-life. Because we're on PA-RISC, we can only upgrade to 11.70.
> > >
> > > Looking at the Migration manual, it states that best practice calls for
> > > removing any outstanding in-place alters prior to upgrading. The manual
> > > includes a link to a support article
> > > (http://www-01.ibm.com/support/docview.wss?uid=swg21144602) that details
> > > how
> > > to identify outstanding in-place alters via the 'oncheck -pT' command,
> > > looking
> > > at the Home Data Page Version Summary of that output.
> > >
> > > The support article above includes a link to another support article
> > > (http://www-01.ibm.com/support/docview.wss?rs=0&uid=swg21160923) that
> > > includes
> > > a shell script, inplacealter.sh, that is supposed to automate this
> > process.
> > >
> > > The article includes a disclaimer that the script is not supported by
> > > Informix
> > > Technical Support.
> > >
> > > I have downloaded the script and tried to run it, but it has problems.
> > For
> > > instance, I found at least three places in the script where it
> > referenced a
> > >
> > > shell variable by name, but without the leading '$'. For instance, there
> > > was a
> > > while statement:
> > >
> > > while [ startbytes -lt numbytes ]
> > >
> > > instead of
> > >
> > > while [ $startbytes -lt $numbytes ]
> > >
> > > After making changes to add the '$' to the places that I spotted, I ran
> > the
> > >
> > > script against a single table. It tells me that there are outstanding
> > > in-place
> > > alters, even though the manual method detailed in the first support
> > article
> > >
> > > tells me that there are no outstanding alters, as all pages are shown as
> > > the
> > > '(current)' version.
> > >
> > > Even more, the script gives me an UPDATE statement to run to fix these
> > > in-place alters. I run the UPDATE, then re-run the script, and get the
> > same
> > >
> > > results.
> > >
> > > Further, there seems to be an issue with the section that sets the shell
> > > variable 'count' (line 212). Sometimes, the variable ends up with an
> > empty
> > > value, which causes problems a few lines later when it tries to pipe a
> > > command
> > > to the dc command, and also when it does
> > >
> > > let sum=$sum+$count
> > >
> > > So, my question (finally) is - does anyone have a debugged version of
> > this
> > > script that they can share? Or an alternate automated method of
> > identifying
> > >
> > > tables with in-place alters?
> > >
> > > Or is the documentation overstating the necessity of clearing the
> > > outstanding
> > > in-place alters?
> > >
> > > Thanks in advance.
> > >
> > >
> > > ************************************************************
> > > *******************
> > >
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> > > ************************************************************
> > > *******************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --
> > Fernando Nunes
> > Portugal
> >
> > http://informix-technology.blogspot.com
> > My email works... but I don't check it frequently...
> >
> >
> > ************************************************************
> > *******************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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