Join IIUG
 for   
 

Informix News
18 Nov 13 - ZDNet - Top 20 mobile skills in demand... Read
09 Sep 13 - telecompaper - Shaspa and Tatung have shown a new smart home platform at Ifa in Berlin. Powered by the IBM Informix software... Read
06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
01 Feb 13 - IBM Data Magazine - Are your database backups safe? Lester Knutsen (IBM Champion) writes about database back up safety using "archecker"... Read
14 Nov 12 - IBM - IBM's Big Data For Smart Grid Goes Live In Texas... Read
3 Oct 12 - The Financial - IBM and TransWorks Collaborate to Help Louisiana-Pacific Corporation Achieve Supply Chain Efficiency... Read
28 Aug 12 - techCLOUD9 - Splunk kicks up a SaaS Storm... Read
10 Aug 12 - businessCLOUD9 - Is this the other half of Cloud monitoring?... Read
3 Aug 12 - IBM data management - Supercharging the data warehouse while keeping costs down IBM Informix Warehouse Accelerator (IWA) delivers superior performance for in-memory analytics processing... Read
2 Aug 12 - channelbiz - Oninit Group launches Pay Per Pulse cloud-based service... Read
28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
23 May 12 - DBTA - Informix Genero: A Way to Modernize Informix 4GL Applications... Read
9 Apr 12 - Mastering Data Management - Upping the Informix Ante: Advanced Data Tools... Read
22 Mar 12 - developerWorks - Optimizing Informix database access... Read
14 Mar 12 - BernieSpang.com - International Informix User Group set to meet in San Diego... Read
1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
1 Mar 12 - IBM Data Management - Running Informix on Solid-State Drives.Speed Up Database Access... Read
26 Feb 12 - BernieSpan.com - Better results, lower cost for a broad set of new IBM clients and partners... Read
24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
6 Feb 12 - PRLOG - Informix port delivers unlimited database scalability for popular SaaS application ... Read
2 Feb 12 - developerWorks - Loading data with the IBM Informix TimeSeries Plug-in for Data Studio... Read
1 Feb 12 - developerWorks - 100 Tech Tips, #47: Log-in to Fix Central... Read
13 Jan 12 - MC Press online - Informix Dynamic Server Entices New Users with Free Production Edition ... Read
11 Jan 12 - Computerworld - Ecologic Analytics and Landis+Gyr -- Suitors Decide to Tie the Knot... Read
9 Jan 12 - planetIDS.com - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - TMCnet.com - IBM Offers Database Solution to Enable Smart Meter Data Capture... Read
1 Aug 11 - IBM Data Management Magazine - IIUG user view: Happy 10th anniversary to IBM and Informix... Read
8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
31 May 11 - Smart Grid - The meter data management pitfall utilities are overlooking... Read
27 May 11 - IBM Data Management Magazine - IIUG user view: Big data, big time ( Series data, warehouse acceleration, and 4GLs )... Read
16 May 11 - Business Wire - HiT Software Announces DBMoto for Enterprise Integration, Adds Informix. Log-based Change Data Capture... Read
21 Mar 11 - Yahoo! Finance - IBM and Cable&Wireless Worldwide Announce UK Smart Energy Cloud... Read
14 Mar 11 - MarketWatch - Fuzzy Logix and IBM Unveil In-Database Analytics for IBM Informix... Read
11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
9 Mar 11 - DBTA - Database Administration and the Goal of Diminishing Downtime... Read
2 Feb 11 - DBTAs - Informix 11.7 Flexible Grid Provides a Different Way of Looking at Database Servers... Read
27 Jan 11 - exactsolutions - Exact to Add Informix Support to Database Replay, SQL Monitoring Solutions... Read
25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
12 Oct 10 - Database Trends and Applications - Informix 11.7: The Beginning of the Next Decade of IBM Informix... Read
20 Sep 10 - planetIDS.com - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11.50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows... Read
20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition... Read
24 May 10 - eWeek Europe - IBM Supplies Database Tech For EU Smart Grid... Read
23 May 10 - SiliconIndia - IBM's smart metering system allows wise use of energy... Read
21 May 10 - CNET - IBM to help people monitor energy use... Read
20 May 10 - ebiz - IBM Teams With Hildebrand To Bring Smart Metering To Homes Across Britain... Read
19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
19 May 10 - ZDNet - IBM software in your home? Pact enables five-city smart meter pilot in Europe... Read
17 March 10 - ZDNet (blog) David Morgenstern - TCO: New research finds Macs in the enterprise easier, cheaper to manage than... Read
17 March 2010 - Virtualization Review - ...key components of Big Blue's platform to the commercial cloud such as its WebSphere suite of application ser vers and its DB2 and Informix databases... Read
10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read


End of Support Dates

IIUG on Facebook IIUG on Twitter

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

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

*******************************************************************************
Forum Note: Use "Reply" to post a response in the discussion forum.

Messages In This Thread

[ View Thread ] [ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.