IDS Forum

Re: Upgrade 11.70 to 12.10

Posted By: Fernando Nunes
Date: Friday, 20 April 2018, at 10:12 a.m.

In Response To: Upgrade 11.70 to 12.10 (SNORRI BERGMANN)

Hmmmmm.... so much to say.
I've been involved mostly in upgrades from 11.50 to 12.10. In almost every
situation it was ok, but the important thing is that it's ok *in your
environment*
Every version has it's problems (as can be seen in the next release
"fixlist"), so careful testing is the most important thing and apparently
you did it.

Regarding UPDATE STATISTICS, you *should do it*. It's a requirement
migration step. And yes, I know that it can take a very long time. At least
do it for procedures (very fast) and then do it for tables as soon as
possible.
There was an RFE to request that the upgrade process converts the old stats
into a new format (if the format changes) to avoid that slow step, but it
was declined:

http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=33799

Please open it again if you, like me think this is one of the major issues
for upgrades.

Version 12.10 has several performance features, but I wouldn't expect any
dramatic performance change. But you must be alert because a query plan
change may speed up or slow down significantly a query. Typically my
experience with 12.10 is very good. The changes are almost on the positive
side of things.

Regarding the $ONCONFIG, 12.10 has several new parameters, and yes, you
should check them and choose the right options for you. One of the good
thing it has is the session limits (locks, memory, temporary space usage
etc.)

Now.... the not so good news. Up till now I've found an annoying/serious
bug on FC10. Due to a change in sysmaster, queries on sysmaster:sysrstcb
may miss some rows. One may think that's an internal thing, but there are
many scripts out there and monitoring tools that depend on this. The fix
should be included in FC11 which shouldn't take too long to show up. An
alternative would be to use a workaround which apparently doesn't have side
effects, but that's not an official suggestion:

1- Run this on sysmaster with user Informix:
UPDATE sysobjstate
SET state = 'D'
WHERE

name = 'sysrstcbscb' AND

tabid = (SELECT t.tabid FROM systables t WHERE t.tabname =
'sysrstcb');

(verify that one record is updated)

2- Restart the engine

This is basically an "hack" to disable a new index introduced in FC10,
which is where the bug exists. Naturally FC11 wouldn't need this, but you'd
have to wait and then redo your tests.
Regards.

On Fri, Apr 20, 2018 at 3:44 PM, SNORRI BERGMANN <snorri@init.is> wrote:

> Hi.
>
> We are running 11.70.FC8W1 on Linux in a Primary / SDS config. Everything
> works well. Now I'm planning to upgrade to the newest 12.10.FC10. I've
> been
> testing the upgrade process (on a restored instance without SDS) and we
> have
> run our application and everything seems to be OK.
>
> Before doing this I'd like to hear if anyone has had any major problems
> with a
> similar upgrade, maybe related to performance, etc. Is update statistics a
> must? I have not seen any performance issues on the upgraded instance, but
> we
> can not test everything :)
>
> Can I expect generally better performance with 12.10 or will it be very
> similar?
> Any pitfalls with new ONCONFIG parameters?
> Any pitfalls at all? :)
>
> Thanks in advance,
> -Snorri
>
>
> *******************************************************************************
>
> 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...

Messages In This Thread

• Upgrade 11.70 to 12.10
  SNORRI BERGMANN -- Friday, 20 April 2018, at 9:44 a.m.
  • Re: Upgrade 11.70 to 12.10
    Fernando Nunes -- Friday, 20 April 2018, at 10:12 a.m.
    • Re: Upgrade 11.70 to 12.10
      SNORRI BERGMANN -- Monday, 23 April 2018, at 5:42 a.m.
      • Re: Upgrade 11.70 to 12.10
        Spokey Wheeler -- Monday, 23 April 2018, at 6:42 a.m.
  • Re: Upgrade 11.70 to 12.10
    BENJAMIN THOMPSON -- Friday, 27 April 2018, at 5:01 a.m.
    • RE: Upgrade 11.70 to 12.10
      Andreas Legner -- Friday, 27 April 2018, at 5:05 a.m.
    • Re: Upgrade 11.70 to 12.10
      SNORRI BERGMANN -- Friday, 27 April 2018, at 5:27 a.m.

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