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

Fwd: RE: Removing excessive extents

Posted By: ART KAGEL, BLOOMBERG/ 65E 55TH
Date: Wednesday, 4 June 2003, at 3:50 p.m.

In Response To: Fwd: RE: Removing excessive extents (John Bejarano )

There is no way to reorg a table with zero downtime. If you need to reorg a
table that is needed live or with minimal downtime the only option is:

1. Create a new table with the same structure and desired extent sizing &
location
2. Copy all rows from the original table to the new one, this is the time
consumer and the last thing you can do without locking out users
3. Lock the original table in exclusive mode
4. Drop all constraints and indexes on the original table (will also destroy any
referencing foreign keys on other tables)
5. Rename the original table to a new name
6. Unlock the original table, the lock's not needed anymore
7. Rename the new table to the original name
8. Lock the table
9. Recreate the indexes on the table
10. Recreate constraints on the table
11. Recreate referencing foreign keys pointing to the table
12. If the original table was active during the copy you may have to recover
missing or updated data at this point. (If this step is difficult given your
table structure and/or the nature of the transactions you may need to add audit
triggers to the table before starting so you can track which rows to delete,
copy, and/or update afterward.)

Art S. Kagel

----- Original Message -----
From: John Bejarano <jbejaran@yahoo.com>
At: 6/ 4 15:35

Yes, but doesn't the alter index...to cluster
statement put an exclusive lock on the table? Seems
that you still need downtime to do this (unless you
can operate with this particular table unavailable for
a while which doesn't apply at my company.)

--John Bejarano
Shutterfly.

--- RPhillips@ce-a.com wrote:
> Date: Wed, 4 Jun 2003 13:31:19 -0400 (EDT)
> To: ids@iiug.org
> From: RPhillips@ce-a.com
> Subject: RE: Removing excessive extents [1277]
>
> You mean like this
> (http://www.iiug.org/forums/ids/index.cgi?read=377)
> Which
> I'm not sure why it is supposed to work.
>
> "I have used the following technique on some of my
> tables when I could not
> get enough down time to do a "proper" resizing
> (unload, change schema, drop
> table, rebuild, load).
>
>
> alter the tables next extent size so that it is
> large enough to hold the
> whole table. Then alter one of the indexes to
> cluster and then drop the
> cluster.
>
>
> it would look like this
>
> alter table table_x modify next size 123456;
> alter index table_x_index to cluster;
> alter index table_x_index to not cluster;"
>
> -----Original Message-----
> From: rkusenet [mailto:rkusenet@sympatico.ca]
> Sent: Wednesday, June 04, 2003 1:12 PM
> To: RPhillips@ce-a.com
> Cc: ids@iiug.org
> Subject: Re: Removing excessive extents [1275]
>
>
> Another easier way can be to create a cluster index
> on hospital table
> and then drop that cluster index.
> when u do that, it will relocate data from its
> present position,
> which would automatically free extents.
>
> ----- Original Message -----
> From: <RPhillips@ce-a.com>
> To: <ids@iiug.org>
> Sent: Wednesday, June 04, 2003 12:41
> Subject: RE: Removing excessive extents [1275]
>
>
> > Could you give me an overview of how this works.
> The only documentation I
> > have on fragments is regarding creating fragments
> in different dbspaces,
> and
> > deleteing them from different dbspaces.
> >
> > Also I did a dbschema on one of the tables that
> have too many extents and
> it
> > didn't give me the size of the extent...
> >
> > { TABLE "informix".hospitals row size = 854 number
> of columns = 34 index
> > size = 12
> > }
> > create table "informix".hospitals
> > (
> > hospital_id serial not null ,
> > hospital_name char(20),
> > hospital_full_name char(50),
> > street char(62),
> > street2 char(62),
> > city char(30),
> > state char(2),
> > zip char(10),
> > phone char(14),
> > fax char(14),
> > mstreet char(62),
> > mstreet2 char(62),
> > mcity char(30),
> > mstate char(2),
> > mzip char(10),
> > use_mail_address char(1),
> > region_id integer,
> > district_id integer,
> > provider_number char(50),
> > contract_start date,
> > contract_end date,
> > ob char(1),
> > comments char(255),
> > in_percent decimal(7,4),
> > out_percent decimal(7,4),
> > profee_in_percent decimal(7,4),
> > profee_out_percent decimal(7,4),
> > last_modified date,
> > iscurrent char(1),
> > modified_by char(3),
> > flat_rate money(16,2),
> > ptreecode char(5),
> > terms integer,
> > email varchar(50),
> > unique (hospital_id)
> > );
> > revoke all on "informix".hospitals from "public";
> >
> > -----Original Message-----
> > From: rkusenet [mailto:rkusenet@sympatico.ca]
> > Sent: Wednesday, June 04, 2003 12:25 PM
> > To: ids@iiug.org; RPhillips@ce-a.com
> > Subject: Re: Removing excessive extents [1273]
> >
> >
> >
> > ----- Original Message -----
> > From: <RPhillips@ce-a.com>
> > To: <ids@iiug.org>
> > Sent: Wednesday, June 04, 2003 11:48
> > Subject: Removing excessive extents [1273]
> >
> >
> > > I have two tables that I want to reorganize to
> reduce the number of
> > extents
> > > that they have. I am clear on how to do this by
> copying the data in the
> > > table, dropping the table and then recreating it
> with a larger extent
> size
> > > and then putting the data back.
> > >
> > > My question is what happens to tables that have
> a foreign key based on
> > this
> > > table when I drop it?
> >
> > Informix will prevent you from dropping.
> >
> > If reducing the number of extent is your goal,
> then use alter fragment
> >
> >
>


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.