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IDS 11.10 - 30 Sep 2012
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Re: Informix 11.10FC2W5 hangs & crashes

Posted By: Mark Jamison
Date: Tuesday, 30 September 2008, at 4:00 p.m.

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

Hi Tim,

The reason alice, and/or numbr of BTREE scanners have been added would only be in response to a hang, not the crashes.

Sounds like you certainly should have 2 PMR's open, as the hangs mostly likely cause the crashes, and the crashes don't cause the hangs.

Getting back to the hangs though. Are they continuing to occur after the changes to BTSCANNER?
The reason I ask, is that until 11.50 the default for BTSCANNER is 1 thread and using Leaf scanning. On a busy system, this combination could, although by no means is guaranteed, to cause system slowness and blocked checkpoints. With leaf scanning, it is very easy for a single BTSCANNER thread to get behind in cleaning and never be able to catch up, the worst case scenario with a BTSCANNER thread in that condition with leaf scanning doesn't allow one index to finish cleaning during the time allotted for an active hot list, and meanwhile the BTSCANNER thread is holding resources needed for a checkpoint to complete. Increasing the number of BTSCANNER threads, would help mitigate this problem, and enabling Alice mode would likely eliminate the hangs. The reason why is that Alice is much faster than leaf scanning. By much faster, I mean that on your average 1 MB Index, a leaf scan can do as many as 680 I/O's, while Alice will do 4.

Don't suppose you have an onstat -C all from your last hang? For that matter, do you happen to have an onstat -C all now?

Again BTSCANNER was only likely addressing the hangs.

----- Original Message ----
From: Tim Ertl <tim@lmrgroup.com>
To: ids@iiug.org
Sent: Monday, September 29, 2008 5:00:49 PM
Subject: Informix 11.10FC2W5 hangs & crashes [13520]

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!

,,,Tim

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