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: Incorrect Query Plan

Posted By: Yunyao (Frank) Qu
Date: Thursday, 15 June 2006, at 10:22 a.m.

In Response To: RE: Incorrect Query Plan (Angus Miller)

HI, Angus,

The index's efficiency depends on the query and data distribution.
If the query needs access large percent of the data, the index may not
be beneficial.

By the way, did you try the following indexes?

CREATE INDEX idx_style ON informix.rpl_scs_plan_ord_wk(style)
CREATE INDEX idx_color ON informix.rpl_scs_plan_ord_wk(colour)
CREATE INDEX idx_trading_date ON informix.rpl_scs_plan_ord_wk(trading_date)
CREATE INDEX idx_size_8 ON informix.rpl_scs_plan_ord_wk(size_8)
CREATE INDEX idx_fin_year ON informix.rpl_scs_plan_ord_wk(fin_year)
CREATE INDEX idx_fin_month ON informix.rpl_scs_plan_ord_wk(fin_month)
CREATE INDEX idx_fin_week ON informix.rpl_scs_plan_ord_wk(fin_week)
CREATE INDEX idx_plan_loc ON informix.rpl_scs_plan_ord_wk(plan_loc)

Frank Qu

Angus Miller wrote:

>Thanks Frank, below are the complete scripts. Please can you elaborate
>on a better desing for the indexes. The sql gets run for a report, the
>reason there for the 3 composite indexes is that queries in general are
>filtering by either:
>
>style, fin_year, fin_week
>style, colour, fin_year, fin_week
>style, colour, size_8, fin_year, fin_week
>
>Here is the info:
>
>SQL statement that needs help
>-----------------------------
>select rpl_scs_plan_ord_wk.style,
>
>rpl_scs_plan_ord_wk.colour,
>
>rpl_scs_plan_ord_wk.size_8,
>
>rpl_scs_plan_ord_wk.fin_year,
>
>rpl_scs_plan_ord_wk.fin_month,
>
>case rpl_scs_plan_ord_wk.fin_month
>
>when 1 then 'Jul'
>
>when 2 then 'Aug'
>
>when 3 then 'Sept'
>
>when 4 then 'Oct'
>
>when 5 then 'Nov'
>
>when 6 then 'Dec'
>
>when 7 then 'Jan'
>
>when 8 then 'Feb'
>
>when 9 then 'Mar'
>
>when 10 then 'Apr'
>
>when 11 then 'May'
>
>when 12 then 'Jun'
>
>end monthname,
>
>rpl_scs_plan_ord_wk.supplier supplier,
>
>sum(rpl_scs_plan_ord_wk.rp_planned_ord_qty) planorders,
>
>case
>
>when
>
>(select sum(a.rp_planned_ord_qty)
>
>from rpl_scs_plan_ord_wk a
>
>where a.style = 197895
>
>and a.colour = 'N3'
>
>and a.fin_year = 2006
>
>and a.fin_month = rpl_scs_plan_ord_wk.fin_month) > 0 then
>
>sum(rpl_scs_plan_ord_wk.rp_planned_ord_qty) /
>
>(select sum(a.rp_planned_ord_qty)
>
>from rpl_scs_plan_ord_wk a
>
>where a.style = 197895
>
>and a.colour = 'N3'
>
>and a.fin_year = 2006
>
>and a.fin_month = rpl_scs_plan_ord_wk.fin_month) * 100
>
>else
>
>sum(0)
>
>end contr,
>
>sum(rpl_scs_plan_ord_wk.orig_order_qty) origorderqty,
>
>sum(rpl_scs_plan_ord_wk.asn_qty) asnqty,
>
>(select sum(rpl_scs_st_orderfill.asn_qty)
>
>from rpl_scs_st_orderfill
>
>where rpl_scs_st_orderfill.fin_year = rpl_scs_plan_ord_wk.fin_year
>
>and rpl_scs_st_orderfill.style = rpl_scs_plan_ord_wk.style
>
>and rpl_scs_st_orderfill.colour = rpl_scs_plan_ord_wk.colour
>
>and rpl_scs_st_orderfill.size_8 = rpl_scs_plan_ord_wk.size_8
>
>and rpl_scs_st_orderfill.fin_week between
>
>(select min(fin_week)
>
>from dim_calendar
>
>where fin_year = rpl_scs_plan_ord_wk.fin_year
>
>and fin_month = rpl_scs_plan_ord_wk.fin_month) and
>
>(select max(fin_week)
>
>from dim_calendar
>
>where fin_year = rpl_scs_plan_ord_wk.fin_year
>
>and fin_month = rpl_scs_plan_ord_wk.fin_month)) orderfillasn,
>
>(select sum(rpl_scs_st_orderfill.di_qty)
>
>from rpl_scs_st_orderfill
>
>where rpl_scs_st_orderfill.fin_year = rpl_scs_plan_ord_wk.fin_year
>
>and rpl_scs_st_orderfill.style = rpl_scs_plan_ord_wk.style
>
>and rpl_scs_st_orderfill.colour = rpl_scs_plan_ord_wk.colour
>
>and rpl_scs_st_orderfill.size_8 = rpl_scs_plan_ord_wk.size_8
>
>and rpl_scs_st_orderfill.fin_week between
>
>(select min(fin_week)
>
>from dim_calendar
>
>where fin_year = rpl_scs_plan_ord_wk.fin_year
>
>and fin_month = rpl_scs_plan_ord_wk.fin_month) and
>
>(select max(fin_week)
>
>from dim_calendar
>
>where fin_year = rpl_scs_plan_ord_wk.fin_year
>
>and fin_month = rpl_scs_plan_ord_wk.fin_month)) orderfilldi
>from rpl_scs_plan_ord_wk where rpl_scs_plan_ord_wk.fin_year = 2006 and
>rpl_scs_plan_ord_wk.style = 197895 and rpl_scs_plan_ord_wk.colour =
>'N3' and rpl_scs_plan_ord_wk.fin_month >=
>
>(select min(fin_month)
>
>from dim_calendar
>
>where fin_year = 2006
>
>and old_season = 'W')
>and rpl_scs_plan_ord_wk.fin_month <=
>
>(select max(last_completed_mt)
>
>from rpl_scs_plan_ord_wk
>
>where style = 197895
>
>and fin_year = 2006
>
>and trading_season = 'W')
>group by rpl_scs_plan_ord_wk.style,
>
>rpl_scs_plan_ord_wk.colour,
>
>rpl_scs_plan_ord_wk.size_8,
>
>rpl_scs_plan_ord_wk.fin_year,
>
>rpl_scs_plan_ord_wk.fin_month,
>
>rpl_scs_plan_ord_wk.supplier,
>
>12,
>
>13
>
>Table rpl_scs_plan_ord_wk
>-------------------------
>CREATE TABLE rpl_scs_plan_ord_wk (
>
>style INTEGER NOT NULL DEFAULT 0,
>
>colour CHAR(2) NOT NULL DEFAULT 0,
>
>size_5 CHAR(5) DEFAULT 0,
>
>size_8 CHAR(8) NOT NULL DEFAULT 0,
>
>plan_loc CHAR(10) NOT NULL DEFAULT 0,
>
>fin_year SMALLINT NOT NULL DEFAULT 0,
>
>fin_month SMALLINT NOT NULL DEFAULT 0,
>
>fin_week SMALLINT NOT NULL DEFAULT 0,
>
>trading_date DATE NOT NULL DEFAULT 0,
>
>trading_season CHAR(1) NOT NULL DEFAULT 0,
>
>msr_indicator CHAR(1) DEFAULT 0,
>
>constr_avail_ind SMALLINT DEFAULT 0,
>
>supplier INTEGER DEFAULT 0,
>
>sales_qty INTEGER DEFAULT 0,
>
>stock_qty INTEGER DEFAULT 0,
>
>intake_qty INTEGER DEFAULT 0,
>
>stk_transit_qty INTEGER DEFAULT 0,
>
>asn_qty INTEGER DEFAULT 0,
>
>rp_planned_ord_qty INTEGER DEFAULT 0,
>
>auto_apprv_ord_qty INTEGER DEFAULT 0,
>
>date_last_updated DATE DEFAULT 0,
>
>proj_style_ord_qty INTEGER DEFAULT 0,
>
>proj_stycol_ord_qty INTEGER DEFAULT 0,
>
>stock_eom_qty INTEGER DEFAULT 0,
>
>sit_eom_qty INTEGER DEFAULT 0,
>
>orig_order_qty INTEGER DEFAULT 0,
>
>last_completed_mt SMALLINT DEFAULT 0,
>
>last_completed_yr SMALLINT DEFAULT 0
>)
>;
>
>CREATE UNIQUE INDEX rpl_scs_plan_ord_wk1 ON
>informix.rpl_scs_plan_ord_wk(style, colour, plan_loc, size_8, fin_week,
>fin_year) ; CREATE INDEX rpl_scs_plan_ord_wk2 ON
>informix.rpl_scs_plan_ord_wk(trading_date, style, colour, size_8) ;
>CREATE INDEX rpl_scs_plan_ord_wk3 ON
>informix.rpl_scs_plan_ord_wk(fin_year, fin_month, style, plan_loc,
>colour) ; CREATE INDEX rpl_scs_plan_ord_wk4 ON
>informix.rpl_scs_plan_ord_wk(fin_year, trading_season, style, plan_loc,
>colour) ;
>
>Table rpl_scs_st_orderfill
>--------------------------
>CREATE TABLE informix.rpl_scs_st_orderfill (
>
>di_id INTEGER NOT NULL DEFAULT 0,
>
>style INTEGER NOT NULL DEFAULT 0,
>
>colour CHAR(2) NOT NULL DEFAULT 0,
>
>size_8 CHAR(8) NOT NULL DEFAULT 0,
>
>store SMALLINT NOT NULL DEFAULT 0,
>
>fin_week SMALLINT NOT NULL DEFAULT 0,
>
>fin_year SMALLINT NOT NULL DEFAULT 0,
>
>trading_date DATE NOT NULL DEFAULT 0,
>
>di_date DATE DEFAULT 0,
>
>di_qty INTEGER DEFAULT 0,
>
>di_val DECIMAL(10, 2) DEFAULT 0,
>
>asn_no DECIMAL(13, 0) DEFAULT 0,
>
>asn_date DATE DEFAULT 0,
>
>asn_qty INTEGER DEFAULT 0,
>
>asn_val DECIMAL(10, 2) DEFAULT 0,
>
>di_curr_qty INTEGER DEFAULT 0,
>
>di_curr_val DECIMAL(10, 2) DEFAULT 0,
>
>asn_curr_qty INTEGER DEFAULT 0,
>
>asn_curr_val DECIMAL(10, 2) DEFAULT 0,
>
>date_last_updated DATE DEFAULT 0
>)
>;
>
>CREATE UNIQUE INDEX ix_rpl_ix1 ON informix.rpl_scs_st_orderfill(di_id,
>style, colour, size_8, store, fin_week, fin_year) ; CREATE INDEX
>ix_rpl_ix2 ON informix.rpl_scs_st_orderfill(style, fin_week, fin_year) ;
>CREATE INDEX ix_rpl_ix3 ON informix.rpl_scs_st_orderfill(style, colour,
>fin_week, fin_year) ; CREATE INDEX ix_rpl_ix4 ON
>informix.rpl_scs_st_orderfill(style, colour, size_8, fin_week, fin_year)
>;
>
>-----Original Message-----
>From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
>Yunyao (Fra....
>Sent: Tuesday, 13 June 2006 07:03 PM
>To: ids@iiug.org
>Subject: Re: Incorrect Query Plan [6945]
>
>It would be lot easier for people to have the full scripts to look at
>at your case.
>BTW, the indexes designed look not pretty(or efficient) to me.
>Frankly, probably there is no best plan in all scenarios for this set of
>
>indexes.
>
>Thanks,
>Frank
>
>Angus Miller wrote:
>
>
>
>>Hi
>>
>>We have a table with 3 composite indexes like so:
>>
>>CREATE INDEX ix_rpl_ix2 ON rpl_scs_st_orderfill(
>>
>>style,
>>
>>fin_week,
>>
>>fin_year);
>>
>>CREATE INDEX ix_rpl_ix3 ON rpl_scs_st_orderfill(
>>
>>style,
>>
>>colour,
>>
>>fin_week,
>>
>>fin_year);
>>
>>CREATE INDEX ix_rpl_ix4 ON rpl_scs_st_orderfill(
>>
>>style,
>>
>>colour,
>>
>>size_8,
>>
>>fin_week,
>>
>>fin_year);
>>
>>I have a query with a subquery like so:
>>
>>Select
>>
>>blah,
>>
>>blah,
>>....
>>
>>(select sum(rpl_scs_st_orderfill.value)
>>
>>
>>
>>from rpl_scs_st_orderfill
>
>
>>where rpl_scs_st_orderfill.style = tablex.style
>>
>>and rpl_scs_st_orderfill.colour = tablex.colour
>>
>>and rpl_scs_st_orderfill.size_8 = tablex.size_8
>>
>>and fin_week between
>>
>>(select min(fin_week)
>>
>>
>>
>>from dim_calendar
>
>
>>where fin_year = tablex.fin_year
>>
>>and fin_month = tablex.fin_month) and
>>
>>(select max(fin_week)
>>
>>
>>
>>from dim_calendar
>
>
>>where fin_year = tablex.fin_year
>>
>>and fin_month = tablex.fin_month))
>>....
>>>From tablex
>>....
>>
>>I have run update statistics as follows for this table:
>>
>>UPDATE STATISTICS MEDIUM FOR TABLE rpl_scs_st_orderfill;
>>UPDATE STATISTICS HIGH FOR TABLE rpl_scs_st_orderfill(style);
>>UPDATE STATISTICS HIGH FOR TABLE rpl_scs_st_orderfill(colour);
>>UPDATE STATISTICS HIGH FOR TABLE rpl_scs_st_orderfill(size_8);
>>UPDATE STATISTICS HIGH FOR TABLE rpl_scs_st_orderfill(fin_week);
>>UPDATE STATISTICS HIGH FOR TABLE rpl_scs_st_orderfill(fin_year);
>>
>>PROBLEM: The query plan for the subquery uses index ix_rpl_ix2 instead
>>of ix_rpl_ix4 which makes a huge difference in perfomance. I have tried
>>
>>
>
>
>
>>everything I can think of, but short of using optimizer directives I
>>cannot get the subquery to use index ix_rpl_ix4
>>
>>Any ideas?
>>
>>Regards
>>Angus
>>
>>
>>
>
>
>
>>-----------------------------------------------------------------------
>>
>>
>---------
>
>
>>Please note: This e-mail and its contents are subject to a disclaimer
>>which can be viewed at http://www.woolworths.co.za/disclaimer. Should
>>you be unable to access the link please e-mail
>>
>>
>disclaimer@woolworths.co.za
>
>
>>and a copy of the disclaimer will be e-mailed to you.
>>
>>
>>
>>
>
>
>
>>***********************************************************************
>>
>>
>********
>
>
>>Forum Note: Use "Reply" to post a response in the discussion forum.
>>
>>
>>
>>
>>
>>
>
>
>

--
Yunyao "Frank" Qu
Computer Sciences Corporation(CSC)
NOAA/CLASS, (301)817-4696

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.