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: Question about sysindexes.clust

Posted By: Eric Rowell
Date: Tuesday, 18 November 2008, at 3:46 p.m.

In Response To: Re: Question about sysindexes.clust (Richard Snoke)

I will try to copy this data in. The read ahead isn't 100% but never drops
below 99.99%

The following are the different run times, the calulcated BTR, Read Ahead
Utilization, and Buffer Wait Ratio. The 9 hour run is the only bad run this
in this data set. The good runs are all after basicly clustering the data.

Runtime 5:47 9:54 4:56 4:45 4:50 4:46 BTR 7.46823 4.27814
8.56996 8.90136 8.74626 8.900555 RAU 99.9938% 99.9946% 99.9947% 99.9948%
99.9947% 99.9938% BR 0.6950% 0.4281% 0.3898% 0.3953% 0.3885% 0.3883%

On Tue, Nov 18, 2008 at 3:37 PM, Richard Snoke <dsnoke@us.ibm.com> wrote:

> Have you looked at the read ahead parameters and utilizaiton? Are you
> using KAIO or not? How much of your buffer pool is occupied by the pages
> of this table and its indexes? At this point this feels like it might be
> that the buffer pages are being thrashed when the data is not pre-sorted
> (which the clustering accomplishes). I've seen that as the cause of
> similar symptoms in other applications.
>
> Dick Snoke
> IBM Data Management - ChannelWorks
> dsnoke@us.ibm.com
> (404) 487-1595
>
> From:
> "Obnoxio The Clown" <obnoxio@serendipita.com>
> To:
> ids@iiug.org
> Date:
> 11/18/2008 03:08 PM
> Subject:
> Re: Question about sysindexes.clust [14015]
>
> Eric Rowell wrote:
> > The following is the explain plain for the only query in the program
> which
> > isn't running correctly. The first is the plan from the normal run
> (filter
> > data had to be changed to project my job). The info after that is from a
>
> > diff of the explain outs for 2 more configurations. Also during all
> tests
> > we used a production like system (smaller CPU and slower SAN) but we
> know
> > the approx. modifier from prod to dev. When we sorted the data by the
> > serial_link and reloaded (changing the fragmentation as shown earlier
> things
> > run much better.
> >
> > EXPLAIN from normal run...
> >
> > QUERY:
> > ------
> > SELECT qd.option_list, oq.optid
> > FROM qty_head qh, qty_det qd, optcombo_qty oq
> > WHERE ((qh.set_no = "FINDA" AND qh.version = "09") OR
> >
> > (qh.set_no = "ORFND" AND qh.version = "01"))
> >
> > AND qh.serial_key = qd.serial_link
> >
> > AND qd.serial_key = oq.option_group_id
> >
> > AND qh.dept_code IN ("AAA","BBB","CCC","DDD","EEE")
> >
> > AND qh.community = "00"
> >
> > Estimated Cost: 1049986
> > Estimated # of Rows Returned: 1083718
> > 1) informix.qh: INDEX PATH
> >
> > (1) Index Keys: dept_code community set_no version phase_no lot
> > area_group_id
> >
> > (Key-First) (Serial, fragments: ALL)
> >
> > Lower Index Filter: (informix.qh.dept_code = 'AAA' AND
> > informix.qh.community = '00' )
> >
> > Index Key Filters: (( (informix.qh.set_no = 'FINDA' AND
> > informix.qh.version = '09')
> >
> > OR (informix.qh.set_no = 'ORFND' AND
> > informix.qh.version = '01')))
> >
> > (2) Index Keys: dept_code community set_no version phase_no lot
> > area_group_id
> >
> > (Key-First) (Serial, fragments: ALL)
> >
> > Lower Index Filter: (informix.qh.dept_code = 'BBB' AND
> > informix.qh.community = '00' )
> >
> > Index Key Filters: (( (informix.qh.set_no = 'FINDA' AND
> > informix.qh.version = '09')
> >
> > OR (informix.qh.set_no = 'ORFND' AND
> > informix.qh.version = '01')))
> >
> > (3) Index Keys: dept_code community set_no version phase_no lot
> > area_group_id
> >
> > (Key-First) (Serial, fragments: ALL)
> >
> > Lower Index Filter: (informix.qh.dept_code = 'CCC' AND
> > informix.qh.community = '00' )
> >
> > Index Key Filters: (( (informix.qh.set_no = 'FINDA' AND
> > informix.qh.version = '09')
> >
> > OR (informix.qh.set_no = 'ORFND' AND
> > informix.qh.version = '01')))
> >
> > (4) Index Keys: dept_code community set_no version phase_no lot
> > area_group_id
> >
> > (Key-First) (Serial, fragments: ALL)
> >
> > Lower Index Filter: (informix.qh.dept_code = 'DDD' AND
> > informix.qh.community = '00' )
> >
> > Index Key Filters: (( (informix.qh.set_no = 'FINDA' AND
> > informix.qh.version = '09')
> >
> > OR (informix.qh.set_no = 'ORFND' AND
> > informix.qh.version = '01')))
> >
> > (5) Index Keys: dept_code community set_no version phase_no lot
> > area_group_id
> >
> > (Key-First) (Serial, fragments: ALL)
> >
> > Lower Index Filter: (informix.qh.dept_code = 'EEE' AND
> > informix.qh.community = '00' )
> >
> > Index Key Filters: (( (informix.qh.set_no = 'FINDA' AND
> > informix.qh.version = '09' )
> >
> > OR (informix.qh.set_no = 'ORFND' AND
> > informix.qh.version = '01')))
> > 2) informix.qd: INDEX PATH
> >
> > (1) Index Keys: serial_link (Serial, fragments: ALL)
> >
> > Lower Index Filter: informix.qh.serial_key = informix.qd.serial_link
> > NESTED LOOP JOIN
> > 3) informix.optcombo_head: INDEX PATH
> >
> > (1) Index Keys: serial_key option_list option_count (Serial,
> > fragments: ALL)
> >
> > Lower Index Filter: informix.qd.optcombo_head_key =
> > informix.optcombo_head.serial_key
> > NESTED LOOP JOIN
> > 4) product.qty_detail: INDEX PATH
> >
> > (1) Index Keys: serial_key (Serial, fragments: ALL)
> >
> > Lower Index Filter: informix.qd.serial_key =
> > product.qty_detail.serial_key
> > NESTED LOOP JOIN
> > 5) informix.oq: INDEX PATH
> >
> > (1) Index Keys: optcombo_head_key opt_id (Key-Only) (Serial,
> > fragments: ALL)
> >
> > Lower Index Filter: informix.oq.optcombo_head_key =
> > product.qty_detail.optcombo_head_key
> > NESTED LOOP JOIN
> >
> > Diff of Explain Plan after just reloading the table:
> > < Estimated Cost: 1049986
> > < Estimated # of Rows Returned: 1083718
> > ---
> >> Estimated Cost: 2348476
> >> Estimated # of Rows Returned: 1486409
> >
> > Diff of Explain Plan after reloading the sorting data (using
> serial_link):
> > < Estimated Cost: 1049986
> > < Estimated # of Rows Returned: 1083718
> > ---
> >> Estimated Cost: 851019
> >> Estimated # of Rows Returned: 1094319
> >
> > The cost difference appears to be in line with the change to the
> > sysindex.clust value for the indexes.
>
> And which table do you query from to see if there are missing rows and
> insert them?
>
> Basically, I can't disagree with your analysis, I'm just curious as to
> why ordering should have such a measurable impact on performance given
> the explain plan. In general, it doesn't.
>
> I feel like there is something lurking in the nether hells of my brain,
> but I can't quite drag it out. Last time I saw something like this, the
> root cause was "XXXX in my opinion" but I can't remember what "XXXX" was.
>
> Give me time. Or Art will be along shortly. :o)
>
> --
> Cheers,
> Obnoxio The Clown
>
> http://obotheclown.blogspot.com
>
>
>
> *******************************************************************************
>
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Eric B. Rowell

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.