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: shared memory parameters

Posted By: JACQUES RENAUT
Date: Tuesday, 9 February 2010, at 4:17 p.m.

In Response To: shared memory parameters (DOUGLAS MERRILL)

You wrote---------------------------------------------------
Having trouble with share memory parameters.
I am trying to locate each piece of the memory size number reported by "onstat -". So far I have been able to correlate changes in onconfig with changes in that onstat number. However, I haven't been able to get it all and can't seem to find out who knows this.

When oninit -v starts up the engine, I see the resident memory pool number reported there but cannot find the details in that number. It's killing me.

You might ask why I'm doing this. Well, we had an assertion failure that we can't account for and when we killed all memory segments (with IBM's help) and rebooted the RHEL 4 AS box, IDS 10.00 FC4 could not attach to the SHMVIRTSIZE memory cited in the onconfig file. IBM suggested we take that 20gb figure and reduce it. We did and IDS attached and we went with it. We still don't know why we can't start the engine with the same 20gb SHMVIRTSIZE we have had for years.

One thing leads to another. We swopped identically memory from our test box to see if we could isolate the problem. No change was noted. Now I'm trying to get very specific about the shared memory parameters on our test box so that I can define and hopefully understand what is going on with our production box.

Of course both boxes are the same except for memory (prod has more). In fact, test has 24gb of ram with 6gb being used for raid5. The prod box has 32gb of ram with 8gb being used for raid5. Strangely, I can push SHMVIRTSIZE to 21gb on test but can only push prod to about 18.5gb. So now I'm in the middle of it. Seems to me something is going on with hardware or the OS but what? Why does IDS initialize with more virtual shared memory than there is memory on the box? Why can't the prod instance initialize using the same onconfig paramaters that it has for years?

On the other hand, here's an easy question: Where can I find the size of the resident pool, other than in the output from oninit -v ?

Thanks to all!

--------------------------------------------------------------------------------

Response

You can see the size of the resident segment via onstat -g seg. I think there is some formula you can use to calculate the size of the resident pool (possibly in the admin guide) and it depends on a lot of different parameters (probably the largest being the BUFFERPOOL definition then probably LOCKS).

IDS can initialize with more shared memory then real memory on the box if you have a big enough swap space. The amount of shared memory you can create and use on a machine is more dependent on OS kernel parameters then physical memory (provided you have enough swap space defined). Do you know if there was any kernel parameter modifications on the prod server? Or any swap changes? Can you post the exact error you get when you try to bring the server online (from either the MSGPATH file or terminal. The exact error you were getting would probably give some clue as to the limiting resource.

Sometimes it's not a resource limit, but a process address space issue in the sense that a shared memory segment will colide with something else in the address space (like a shared library). You might take a look at pmap output and see if any shared memory segments are getting near anything else in the address space (as the engine generally requires that our shared memory be contiguous). That can be worked around with SHMBASE or I believe commands to modify the shared library to tell it where in the address space to load.

Jacques Renaut
IBM Informix Advanced Support
APD Team

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.