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IDS Forum

RE: Informix 11.10FC2W5 hangs & crashes

Posted By: Stuart McCann
Date: Monday, 29 September 2008, at 9:53 p.m.

In Response To: RE: Informix 11.10FC2W5 hangs & crashes (Tim Ertl)

Tim,

Are you using any DataBlades ? Eg: Spatial, rtree ... ??

You may need to locate these into your new $INFORMIXDIR/extend directory
as they may not be included in DBServer Distro.

Do you have an af files or message log errors to post ??

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Tim Ertl
Sent: Tuesday, 30 September 2008 10:47 AM
To: ids@iiug.org
Subject: RE: Informix 11.10FC2W5 hangs & crashes [13522]

Obnoxio the Clown,
Wow the best question in the world is the one nobody can answer. The
customer (me) always say, Nothing in the past 6 weeks? But even I have
to
ask what changed. We have had an increase in database activity and one
of
the tables had a new field added. Three programs had some business logic

changed but even after backing off all changes prior to the first
Assertion
we still had 5 more problems. So it looks like the increase in loading I

guess.

I am told by IBM that the fix is to add a Btree scanner called alice. I
read
a little about it and it looks more like a performance tweek. I can not
understand how that can crash twice and hang 4 times a whole server. All
6
times on a Blocked Checkpoint. I am one of the "admin free" kinda sites.
We
set things up and they run for 8 years. Then I upset the cart by
installing
11.10FC2 on a new Sun 6 weeks ago and now it goes bump, mostly after the

onbar backups have finished (3 times it did that).

If I get a full nights sleep tonight I might be willing to accept Alice
but
I am still skeptical. I wish I ask more about the one line fix to the
onconfig file. I may have to go to another user group meeting to get
that
answer.

Tim Ertl
413-442-9000 x6211

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Obnoxio The Clown
Sent: Monday, September 29, 2008 7:07 PM
To: ids@iiug.org
Subject: Re: Informix 11.10FC2W5 hangs & crashes [13521]

Tim Ertl wrote:
> We have about 6 or 7 MAJOR failures of Infmormix 11.10FC2W5 in the
past
> few days. I have a pmr going and a tech support person working on it
for
> several days now.
>
> I am hoping someone else might have seen this problem and fixed it
them
> selves. I am all Googled out.
>
> We have had Assertions and HANGS on Blocked Check Points. Sometimes we

> can stay up for only 3 hours other times we stay up for a whole day.
> This morning alone we Hang at 6am and then again at 9. Now we are
quite
> till 17:30. We have restricted usage to Medical Emergencies Only to
> prevent any unnecessary usage. We move some stuff over to M/S Sql
> (something some people around here looked for excuses to do).
>
> We have been running 11.10FC2 since Aug 16th no problems. Then all of
a
> sudden we have an assertion at 3 oclock last Thursday monring. Since
> then we have had about 6/7 Informix Failures.
> IBM Support had us upgrade to W5 and since we did that we have had 4
> more problems. IBM has added and onmode -C alice 6 for some reason I
do
> not understand. We can not continue like this.
>
> ALL of these problems start off with about an hour of the informix log

> saying Txns blocked:1 and checkpoint durations greater than 0. We used

> to have zero all the time for these. During the hour before lock up we

> have slow periods of up to 5 minutes then all of a sudden things free
up
> and we go back to normal, on and off hangs. Then after about an hour
of
> this the system freezes on blocked check point.
>
> Physical log is at 1% used and there are 7 logical logs and only one
is
> in use. The others are backed up.
>
> I have tons of onstat -a's. Has anyone had some experience with
blocked
> check points that might be able to shed some light on this.
>
> Why would informix go belly up all of a sudden like this?
>
> Running on a Sun Sparc T5120 32gb memory, 64 virtual processors (cores

> or what ever they call them). Ton's of disk space now. We upgraded Aug

> 16th and things have been great, then crash!
>
> Thanks for any suggestions.
> We may need to hire special help!
>

What has changed?

--
Cheers,
Obnoxio the Clown

http://obotheclown.blogspot.com

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