International Informix Users Group

	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 Previous news items

End of Support Dates

IDS 11.10 - 30 Sep 2012 Subscribe to notifications

Home Member Area Forums About IIUG Help

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

IDS Forum

Re: b-tree scanner tuning and expected behavior

Posted By: John Miller iii
Date: Tuesday, 22 July 2008, at 12:11 p.m.

In Response To: Re: b-tree scanner tuning and expected behavior (Obnoxio The Clown)

I would first allow range scans to be run on your system. Currently
these are disabled. To do this you can run onmode -C rangesize 100
This means all tables with more than 100 pages will use range scaning.
To make this permanent you need to set the configuration parameter
BTSCANNERS. To include previously mentioned recommendation
your configuration parameter should look like this.
BTSCANNERS num=3D2,threshold=3D500000,rangsize=3D100
GERARDO PADIERNA said:
> here the outputs, and thanks for the references.
> Regards.
>
> juanclu1-[PROD]-(db1):~ $ onstat -C
>
> IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 5 days
> 21:33:27
> -- 2015232 Kbytes
>
> Btree Cleaner Info
> BT scanner profile Information
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D
> Active Threads 8
> Global Commands 20000 Building hot list
> Number of partition scans 8433
> Main Block 0x0000000156edad58
> BTC Admin 0x000000015b9b2850
>
> BTS info id Prio Partnum Key Cmd
> 0x1595ffbb0 0 High 0x00000000 0 20000 Building hot list
>
> Number of leaves pages scanned 1717756000
Eeek!
> Number of leaves with deleted items 2126059045
>
> Time spent cleaning (sec) 71884
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEK!
OK, only two of these cleaners are actually doing anything, but between=
them they have been active for nearly 25% of your uptime. That is insan=
e.
Increase your threshold to at least 500000, drop the other 6 cleaners a=
nd
then monitor the situation.
onmode -C threshold 500000
You may want to increase it even more.
> 0x15d7aebb0 1 High 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 56335
> 0x1693518d8 2 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 2
> 0x1640809b0 3 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 4
> 0x169a26028 4 High 0x00000000 0 40 Yield N
> Time spent cleaning (sec) 9
> 0x15c9f38f0 5 High 0x006000CC 1 100000 Scan index
> Time spent cleaning (sec) 8
> 0x1697e1ba8 6 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 2
> 0x1560165a8 7 Low 0x00000000 0 20000 Building hot list
> Time spent cleaning (sec) 3
> __________________________________________________________________
>
> juanclu1-[PROD]-(db1):~ $ onstat -C hot
>
> IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 5 days
> 21:35:15
> -- 2015232 Kbytes
>
> Btree Cleaner Info
>
> Index Hot List
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> Current Item 2 List Created 12:00:54
>
> List Size 1 List expires in 0 sec
>
> Hit Threshold 100000 Range Scan Threshold -1
Try setting range to 100: onmode -C range 100
> Partnum Key Hits
> 0x006000CB 1 8789 *
>
> ____________________________________________________________________
>
> juanclu1-[PROD]-(db1):~ $ onstat -C clean
>
> IBM Informix Dynamic Server Version 9.40.FC9 -- On-Line -- Up 5 days
> 21:35:38
> -- 2015232 Kbytes
>
> Btree Cleaner Info
>
> Index Cleaned Statistics
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D
> Partnum Key Dirty Hits Clean Time Pg Examined Items Del Pages/Sec
> 0x006000c9 1 1192 15 371030 1388602 24735.33
> 0x006000ca 1 7470 92 466585 1597270 5071.58
> 0x006000cb 1 12682 161 569000 1733933 3534.16
> 0x006000cc 1 C 1690589 292236 -171845166 1725977 14108.88
This is interesting ... why so many deletes?
> 0x00600096 1 750 15 353304 1363336 23553.60
> 0x006000bb 1 1014 12 127990 710001 10665.83
Check all these partitions. See if there are any indexes you can drop.
Have a look at your application, it seems to be doing a lot of index
deleting...
--
Bye now,
Obnoxio
http://obotheclown.blogspot.com/
***********************************************************************=
********
Forum Note: Use "Reply" to post a response in the discussion forum.
=

Messages In This Thread

b-tree scanner tuning and expected behavior
GERARDO PADIERNA -- Monday, 21 July 2008, at 4:11 a.m.
- Re: b-tree scanner tuning and expected behavior
  Obnoxio The Clown -- Monday, 21 July 2008, at 4:21 a.m.
  - Re: b-tree scanner tuning and expected behavior
    GERARDO PADIERNA -- Monday, 21 July 2008, at 4:55 a.m.
    - Re: b-tree scanner tuning and expected behavior
      Obnoxio The Clown -- Monday, 21 July 2008, at 5:15 a.m.
      - Re: b-tree scanner tuning and expected behavior
        John Miller iii -- Monday, 21 July 2008, at 11:23 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Fernando Nunes -- Monday, 21 July 2008, at 12:03 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        tilleul17@web.de -- Monday, 21 July 2008, at 3:30 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        Eric Rowell -- Monday, 21 July 2008, at 3:32 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        tilleul17@web.de -- Thursday, 24 July 2008, at 4:24 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        GERARDO PADIERNA -- Tuesday, 22 July 2008, at 5:13 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Obnoxio The Clown -- Tuesday, 22 July 2008, at 6:00 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        GERARDO PADIERNA -- Tuesday, 22 July 2008, at 6:32 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Obnoxio The Clown -- Tuesday, 22 July 2008, at 7:06 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        John Miller iii -- Tuesday, 22 July 2008, at 12:11 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        Obnoxio The Clown -- Tuesday, 22 July 2008, at 12:21 p.m.
        
        Re: b-tree scanner tuning and expected behavior
        GERARDO PADIERNA -- Tuesday, 29 July 2008, at 4:49 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        John Miller iii -- Wednesday, 30 July 2008, at 2:18 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Peter_Logan@spartanstores.com -- Tuesday, 22 July 2008, at 8:15 a.m.
        
        Re: b-tree scanner tuning and expected behavior
        Peter_Logan@spartanstores.com -- Friday, 25 July 2008, at 9:17 a.m.

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

IDS Forum is maintained by Administrator with WebBBS 5.12.