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
IDS 11.10 - 30 Sep 2012
Subscribe to notifications

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: Obnoxio The Clown
Date: Tuesday, 18 November 2008, at 3:01 p.m.

In Response To: Re: Question about sysindexes.clust (Eric Rowell)

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

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.