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: AW: Performance degradation over a period

Posted By: georgepalmer@cox.net
Date: Friday, 5 February 2010, at 7:49 p.m.

In Response To: Re: AW: Performance degradation over a period (NANDKISHOR SINGARE)

I know in older versions of informix. The fact you created a new table ( with index ) inside the application, then began loading it, ment the table never had a good set of statistics, and virtually looks like an empty table for the entrie run of the application..

I have not tried this against a recent version of informix, but I will bet all SELECT statements are reverting to a sequential scan due to the stats showing an empty table for the entire run of the application.

Also updates will search for rows using sequential scan instead of unsing the index.

In the passt I alway place an update statistics low at a couple points ( after 10,000 rows, then again after 100,000 and possibley one more after a million rows.) the placement was just a set of numbers I picked without reason.

Anyway the performance imporved greatly after embeding the stats ( start using indices and suddenly things get fast.

The slowing being progressive ( or atleast sound like it progressivie ) is what make me think this may be the issue.

George
---- NANDKISHOR SINGARE <ns_singare@yahoo.com> wrote:
> Hi Andreas,
>
> The process runs for around 2 hours. But the process becomes slow after 5-6
> minutes. Only one index on table. The application creates this table and index
> and then records get inserted. After inserting around 70K records(within first
> 3-4 minutes), the records are updated one by one. The logic inserts row in
> table and if duplicate row error is thrown then runs update SQL. This
> combination of "insert row - if duplicate then update record" become slow over
> period. Also checkpoint duration also increases to 50-90 seconds. The
> insert/update is commited only after 500 transactions. Any clues please?
>
> Thanks,
> Nandkishor
> ----------
>
> Hi,
>
> what do you mean by some period: seconds, minutes, hours, days, months ?
>
> Many indexes on the tables ?
>
> New tables/indexes, when the application starts ?
>
> Regards,
> Andreas
>
> >
> -------------------------------------------
> SPAR Österreichische Warenhandels-AG
> Hauptzentrale
> A - 5015 Salzburg, Europastrasse 3
> FN 34170 a
>
> Tel: +43 662 4470 84923
> Fax:
> Mobile: +43 664 6259575
> E-Mail: Andreas.KUTSCHE@spar.at
> Internet: http://www.spar.at
>
> Wichtiger Hinweis: Der Inhalt dieser E-Mail kann vertrauliche und rechtlich
> geschützte Informationen, insbesondere Betriebs- oder Geschäftsgeheimnisse,
> enthalten, zu deren Geheimhaltung der Empfänger verpflichtet ist. Die
> Informationen in dieser E-Mail sind ausschließlich für den Adressaten
> bestimmt. Sollten Sie die E-Mail irrtümlich erhalten haben so ersuchen wir
> Sie, die Nachricht von Ihrem System zu löschen und sich mit uns in Verbindung
> zu setzen.
> Über das Internet versandte E-Mails können leicht manipuliert oder unter
> fremdem Namen erstellt werden. Daher schließen wir die rechtliche
> Verbindlichkeit der in dieser Nachricht enthaltenen Informationen aus. Der
> Inhalt der E-Mail ist nur rechtsverbindlich, wenn er von uns schriftlich
> bestätigt und gezeichnet wird.
> Sollte trotz der von uns verwendeten Virus-Schutzprogramme durch die Zusendung
> von E-Mails ein Virus in Ihre Systeme gelangen, haften wir nicht für evtl.
> hieraus entstehende Schäden.
> Wir danken für Ihr Verständnis.
>
> Important notice: The contents of this e-mail may contain confidential and
> legally protected information that is in particular related to operational and
> trade secrets, which the recipient is obliged to treat as confidential. The
> information in this e-mail is made available exclusively for use by the
> addressee. In the event that the e-mail may have been sent to you in error, we
> would ask you to kindly delete this communication from your system and to
> contact us.
> E-mails sent via the Internet can be easily manipulated or sent out under
> someone else's name. We therefore do not accept legal liability for the
> information contained in this communication. The contents of the e-mail are
> only legally binding if they have been confirmed and signed by us in writing.
> If, in spite of our using Antivirus protection software, a virus may have
> penetrated your system through the sending of this e-mail, we do not accept
> liability for any damage that may possibly arise as a result of this.
> We trust that you appreciate our position.
>
> -------------------------------------------
> -----Ursprüngliche Nachricht-----
>
> > Von: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Im Auftrag von
> > NANDKISHOR SINGARE
> > Gesendet: Freitag, 5. Februar 2010 10:31
> > An: ids@iiug.org
> > Betreff: Performance degradation over a period [18917]
> >
> > Hi,
> >
> > Environment: Linux x86_64, IDS 11.50.FC3.
> >
> > Application is insert and update intensive. The inserts/updates are very
> > fast
> > initially but slow down and take more time later. The application runs
> > with 10
> > threads which commit transaction after 500 inserts/updates. The
> > checkpoints
> > also take more time after some period and application becomes very slow.
> > What can be causing delayed transactions after some period.
> > Please guide.
> >
> > Following are config params-
> > -----------------------------
> > PHYSFILE 1048470
> > PHYSBUFF 1024
> > LOGFILES 35
> > LOGSIZE 10000
> > DYNAMIC_LOGS 2
> > LOGBUFF 64
> > LTXHWM 70
> > LTXEHWM 80
> > NETTYPE ipcshm,1,50,CPU
> > LISTEN_TIMEOUT 60
> > MAX_INCOMPLETE_CONNECTIONS 1024
> > MULTIPROCESSOR 1
> > VPCLASS
> > VP_MEMORY_CACHE_KB 0
> > SINGLE_CPU_VP 0
> > CLEANERS 8
> > AUTO_AIOVPS 1
> > DIRECT_IO 0
> > LOCKS 200000
> > DEF_TABLE_LOCKMODE page
> > RESIDENT 1
> > SHMVIRTSIZE 2048000
> > SHMADD 8192
> > EXTSHMADD 8192
> > SHMTOTAL 0
> > SHMVIRT_ALLOCSEG 0,3
> > SHMNOACCESS
> > CKPTINTVL 300
> > AUTO_CKPTS 1
> > RTO_SERVER_RESTART 0
> > BLOCKTIMEOUT 3600
> > TXTIMEOUT 300
> > DEADLOCK_TIMEOUT 60
> > LTAPEBLK 32
> > LTAPESIZE 0
> > FILLFACTOR 90
> > MAX_FILL_DATA_PAGES 0
> > BTSCANNER num=1,threshold=5000,rangesize=-1,alice=6,compression=default
> > ONLIDX_MAXMEM 128000
> > MAX_PDQPRIORITY 100
> > DS_MAX_QUERIES
> > DS_TOTAL_MEMORY 512000
> > DS_MAX_SCANS 1048576
> > DS_NONPDQ_QUERY_MEM 512
> > RA_PAGES 64
> > RA_THRESHOLD 16
> > BUFFERPOOL
> > default,buffers=10000,lrus=8,lru_min_dirty=50.000000,lru_max_dirty=60.5000
> > 00
> > BUFFERPOOL
> > size=2K,buffers=500000,lrus=8,lru_min_dirty=50.000000,lru_max_dirty=60.000
> > 000
> > AUTO_LRU_TUNING 1
> > VPCLASS cpu,num=7,noage
> > LOCKS 2000
> > --------------------------
> > onstat -p output
> > --------------------------
> > IBM Informix Dynamic Server Version 11.50.FC3 -- On-Line -- Up 17 days
> > 05:56:44 -- 3164116 Kbytes
> >
> > Profile
> > dskreads pagreads bufreads %cached dskwrits pagwrits bufwrits %cached
> > 21516802 94283915 17657895098 99.88 11827207 28999243 283105574 95.84
> >
> > isamtot open start read write rewrite delete commit rollbk
> > 1020886880 1585668 23913359 639061512 25057378 788878 8907 122212 101
> >
> > gp_read gp_write gp_rewrt gp_del gp_alloc gp_free gp_curs
> > 0 0 0 0 0 0 0
> >
> > ovlock ovuserthread ovbuff usercpu syscpu numckpts flushes
> > 0 0 0 68114.80 2302.94 1243 29911
> >
> > bufwaits lokwaits lockreqs deadlks dltouts ckpwaits compress seqscans
> > 1399786 11 717002473 0 0 880 2970498 254229
> >
> > ixda-RA idx-RA da-RA RA-pgsused lchwaits
> > 260446 3327945 9654376 13248107 14058331
> >
> > ---------------------------
> > Thanks,
> > Nandkishor
> > -------------
> >
> >
> > **************************************************************************
> > *****
> > Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
> *******************************************************************************
> 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.