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: Performance difference between IN and OR ?

Posted By: John Miller iii
Date: Wednesday, 9 March 2011, at 2:15 p.m.

In Response To: Re: Performance difference between IN and OR ? (Fernando Nunes)

How are the statistics updated? Were they high on the table??

John F. Miller III
STSM, Embedability Architect
miller3@us.ibm.com
503-578-5645
IBM Informix Dynamic Server (IDS)

ids-bounces@iiug.org wrote on 03/09/2011 10:54:01 AM:

> [image removed]
>
> Re: Performance difference between IN and OR ? [23019]
>
> Fernando Nunes
>
> to:
>
> ids
>
> 03/09/2011 10:56 AM
>
> Sent by:
>
> ids-bounces@iiug.org
>
> Please respond to ids
>
> select * from customer where customer_num in (100,101, 104);
> select * from customer where customer_num =3D100 or customer_num=3D10=
1 or
> customer_num=3D104;
>
> on 11.70.UC1 on Linux have the same (indexed) query plan...
> I believe there's more to it than we're seeing...?
>
> Regards.
>
> On Wed, Mar 9, 2011 at 5:29 PM, Khaled Bentebal <
> khaled.bentebal@consult-ix.fr> wrote:
>
> > My run was on 11.70.FC1 on Mac OS not Linux.
> >
> > My test on 11.50.FC4 was on Linux.
> >
> > Strange. I always said it should be same until I tested it on
thisversion.
> >
> > Khaled Bentebal
> >
> > Email: khaled.bentebal@consult-ix.fr
> > Site Web: www.consult-ix.fr
> >
> > Le 09/03/11 18:21, Art Kagel a =E9crit :
> > > Interesting. My run was on 11.70.FC1 on Linux as well. Just
> > > reinforces my emphasis on testing testing testing.
> > >
> > > Art
> > >
> > > Art S. Kagel
> > > Advanced DataTools (www.advancedatatools.com
> > > <http://www.advancedatatools.com>)
> > > IIUG Board of Directors (art@iiug.org <mailto:art@iiug.org>)
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > Disclaimer: Please keep in mind that my own opinions are my own
> > > opinions and do not reflect on my employer, Advanced DataTools, t=
he
> > > IIUG, nor any other organization with which I am associated eithe=
r
> > > explicitly, implicitly, or by inference. Neither do those opinion=
s
> > > reflect those of other individuals affiliated with any entity wit=
h
> > > which I am affiliated nor those of the entities themselves.
> > >
> > >
> > >
> > > On Wed, Mar 9, 2011 at 12:15 PM, Khaled Bentebal
> > > <khaled.bentebal@consult-ix.fr
<mailto:khaled.bentebal@consult-ix.fr>>
> > > wrote:
> > >
> > > I tried it on 11.50.FC4 and the result is not the same. That is
> > > why I said NOT anymore.
> > >
> > > There is definitely a difference between the versions.
> > >
> > > Here is what I get on 11.50.FC4 on LINUX:
> > >
> > > QUERY: (OPTIMIZATION TIMESTAMP: 03-09-2011 18:11:46)
> > > ------
> > > select * from customer where customer_num in (100,101, 104)
> > >
> > > Estimated Cost: 1
> > > Estimated # of Rows Returned: 2
> > >
> > > 1) informix.customer: INDEX PATH
> > >
> > > (1) Index Keys: customer_num (Serial, fragments: ALL)
> > > Lower Index Filter: informix.customer.customer_num =3D 100
> > >
> > > (2) Index Keys: customer_num (Serial, fragments: ALL)
> > > Lower Index Filter: informix.customer.customer_num =3D 101
> > >
> > > (3) Index Keys: customer_num (Serial, fragments: ALL)
> > > Lower Index Filter: informix.customer.customer_num =3D 104
> > >
> > >
> > >
> > > Query statistics:
> > > -----------------
> > >
> > > Table map :
> > > ----------------------------
> > > Internal name Table name
> > > ----------------------------
> > > t1 customer
> > >
> > >
> > > type table rows_prod est_rows rows_scan time est_cost
> > > -----------------------------------------------------------------=
--
> > > scan t1 2 2 2 00:00.02 1
> > >
> > > QUERY: (OPTIMIZATION TIMESTAMP: 03-09-2011 18:11:46)
> > > ------
> > > select * from customer where customer_num =3D 100 or
> > > customer_num=3D101 or customer_num=3D 104
> > >
> > > Estimated Cost: 3
> > > Estimated # of Rows Returned: 2
> > >
> > > 1) informix.customer: INDEX PATH
> > >
> > > (1) Index Keys: customer_num (Serial, fragments: ALL)
> > > Lower Index Filter: informix.customer.customer_num =3D 100
> > >
> > > (2) Index Keys: customer_num (Serial, fragments: ALL)
> > > Lower Index Filter: informix.customer.customer_num =3D 101
> > >
> > > (3) Index Keys: customer_num (Serial, fragments: ALL)
> > > Lower Index Filter: informix.customer.customer_num =3D 104
> > >
> > >
> > >
> > > Query statistics:
> > > -----------------
> > >
> > > Table map :
> > > ----------------------------
> > > Internal name Table name
> > > ----------------------------
> > > t1 customer
> > >
> > >
> > > type table rows_prod est_rows rows_scan time est_cost
> > > -----------------------------------------------------------------=
--
> > > scan t1 2 2 2 00:00.00 3
> > >
> > >
> > >
> > > Khaled Bentebal
> > >
> > > Email:khaled.bentebal@consult-ix.fr <mailto:
> > khaled.bentebal@consult-ix.fr>
> > > Site Web:www.consult-ix.fr <http://www.consult-ix.fr>
> > >
> > >
> > > Le 09/03/11 17:55, Art Kagel a =E9crit :
> > >> Not true Kaled. Here is the same query both as an IN() and as
> > >> OR's and the optimizer used the identical indexed query path for=

> > >> both. Interestingly, it calculated sightly different costs for
> > >> the two versions, but identical results. The optimizer MAY make
> > >> different path decisions for IN(), OR and UNION ALL, but it will=

> > >> not neccessarily do so:
> > >>
> > >>
> > >>
> > >> QUERY: (OPTIMIZATION TIMESTAMP: 03-09-2011 11:50:44)
> > >> ------
> > >> select * from files where create in ('2001-01-01 12:12:12',
> > >> '2002-01-01 12:12:12', '2003-01-01 12:12:12')
> > >>
> > >> Estimated Cost: 165
> > >> Estimated # of Rows Returned: 1147
> > >>
> > >> 1) informix.files: INDEX PATH
> > >>
> > >> (1) Index Name: informix.files_create
> > >> Index Keys: create (Serial, fragments: ALL)
> > >> Lower Index Filter: informix.files.create =3D
> > >> datetime(2001-01-01 12:12:12) year to second
> > >>
> > >> (2) Index Name: informix.files_create
> > >> Index Keys: create (Serial, fragments: ALL)
> > >> Lower Index Filter: informix.files.create =3D
> > >> datetime(2002-01-01 12:12:12) year to second
> > >>
> > >> (3) Index Name: informix.files_create
> > >> Index Keys: create (Serial, fragments: ALL)
> > >> Lower Index Filter: informix.files.create =3D
> > >> datetime(2003-01-01 12:12:12) year to second
> > >>
> > >>
> > >> Query statistics:
> > >> -----------------
> > >>
> > >> Table map :
> > >> ----------------------------
> > >> Internal name Table name
> > >> ----------------------------
> > >> t1 files
> > >>
> > >> type table rows_prod est_rows rows_scan time est_cost
> > >> ----------------------------------------------------------------=
---
> > >> scan t1 0 1147 0 00:00.03 166
> > >>
> > >>
> > >> QUERY: (OPTIMIZATION TIMESTAMP: 03-09-2011 11:51:15)
> > >> ------
> > >> select * from files where create =3D'2001-01-01 12:12:12' or cre=
ate
> > >> =3D'2002-01-01 12:12:12' or create =3D'2003-01-01 12:12:12'
> > >>
> > >> Estimated Cost: 171
> > >> Estimated # of Rows Returned: 1147
> > >>
> > >> 1) informix.files: INDEX PATH
> > >>
> > >> (1) Index Name: informix.files_create
> > >> Index Keys: create (Serial, fragments: ALL)
> > >> Lower Index Filter: informix.files.create =3D
> > >> datetime(2001-01-01 12:12:12) year to second
> > >>
> > >> (2) Index Name: informix.files_create
> > >> Index Keys: create (Serial, fragments: ALL)
> > >> Lower Index Filter: informix.files.create =3D
> > >> datetime(2002-01-01 12:12:12) year to second
> > >>
> > >> (3) Index Name: informix.files_create
> > >> Index Keys: create (Serial, fragments: ALL)
> > >> Lower Index Filter: informix.files.create =3D
> > >> datetime(2003-01-01 12:12:12) year to second
> > >>
> > >>
> > >> Query statistics:
> > >> -----------------
> > >>
> > >> Table map :
> > >> ----------------------------
> > >> Internal name Table name
> > >> ----------------------------
> > >> t1 files
> > >>
> > >> type table rows_prod est_rows rows_scan time est_cost
> > >> ----------------------------------------------------------------=
---
> > >> scan t1 0 1147 0 00:00.00 172
> > >>
> > >> Art S. Kagel
> > >> Advanced DataTools (www.advancedatatools.com
> > >> <http://www.advancedatatools.com>)
> > >> IIUG Board of Directors (art@iiug.org <mailto:art@iiug.org>)
> > >> Blog: http://informix-myview.blogspot.com/
> > >>
> > >> Disclaimer: Please keep in mind that my own opinions are my own
> > >> opinions and do not reflect on my employer, Advanced DataTools,
> > >> the IIUG, nor any other organization with which I am associated
> > >> either explicitly, implicitly, or by inference. Neither do those=

> > >> opinions reflect those of other individuals affiliated with any
> > >> entity with which I am affiliated nor those of the entities
> > >> themselves.
> > >>
> > >>
> > >>
> > >> On Wed, Mar 9, 2011 at 10:16 AM, Khaled Bentebal
> > >> <khaled.bentebal@consult-ix.fr
> > >> <mailto:khaled.bentebal@consult-ix.fr>> wrote:
> > >>
> > >> It used to be the same thing . Not anymore.
> > >>
> > >> The*in* works better since the optimizer will choose an index
> > >> if the column is
> > >> indexed.
> > >>
> > >> With the*ORs*, the optimizer will be choose a sequential access.=

> > >>
> > >> Try it with a set explain prior to executing the query.
> > >>
> > >> Khaled Bentebal
> > >>
> > >> Email: khaled.bentebal@consult-ix.fr
> > >> <mailto:khaled.bentebal@consult-ix.fr>
> > >> Site Web: www.consult-ix.fr <http://www.consult-ix.fr>
> > >>
> > >> Le 09/03/11 15:58, VAL=E9RIE TAESCH a =E9crit :
> > >> > Hello,
> > >> >
> > >> > is there any performance difference between IN and OR in a
> > >> sql request ?
> > >> >
> > >> > A/select * from table where id in (1,2,3)
> > >> >
> > >> > B/select * from table where id=3D1 or id=3D2 or id=3D3
> > >> >
> > >> > thanks
> > >> >
> > >> >
> > >> >
> > >>
> >
> >
>
***********************************************************************=
********

> > >> > Forum Note: Use "Reply" to post a response in the
> > >> discussion forum.
> > >> >
> > >> >
> > >>
> > >>
> > >>
> >
> >
>
***********************************************************************=
********

> > >> Forum Note: Use "Reply" to post a response in the discussion
> > >> forum.
> > >>
> > >>
> > >
> >
> >
> >
> >
>
***********************************************************************=
********

> > Forum Note: Use "Reply" to post a response in the discussion forum.=

> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
> --0015174bdebc70b7f7049e113fab
>
>
>
***********************************************************************=
********

> 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.