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: Modify initial and next extents

Posted By: LARRY SORENSEN
Date: Tuesday, 22 February 2011, at 3:30 p.m.

In Response To: Modify initial and next extents (TRI TRINH)

Once created, there is no way to alter the initial extent without reloading. You would want to modify the next extent. Here are your options:

ALTER INDEX TO CLUSTER: Clustering an index rebuilds the table with the rows in index order in a different location within the dbspace. This cluster order is not respected in future updates, requiring that this be done periodically. For this to work, all indexes must be dropped, a single index clustered and the remaining indexes recreated. This command requires that there be sufficient space within the dbspace to create a copy of the original table. As the table grows and this process is repeated, allocation of new extents cannot be contiguous as the dbspace has holes left behind by the prior rebuild(s). The reality of this solution is that it requires a large amount of additional space to be maintained in the dbspace and it makes extent interleaving worse over time.

ALTER FRAGMENT: By modifying the fragmentation scheme, INFORMIX will rebuild the table, similar to option 1. For large tables, this is generally not a viable alternative, as too much free space is required and performance suffers when a temporary fragmentation scheme is employed.

UNLOAD / RELOAD DATA & DDL: You can unload the table, drop and re-create it, then reload the data. To perform this in a realistic time frame, all indexes must be removed before and recreated once reload is complete. In addition, by performing a DROP on the object, constraints, stored procedures and other related constructs need to be managed as well. This is a manual process which requires the maintenance of DDL for the table, correct sequencing of commands and the ability to control user access during the process. One wrong step and data or application logic contained in the database may be corrupted or lost. Even by performing this type of management, if more than one table exists in a dbspace the DBA may still incur extent interleaving if he does one object at a time.

Larry

> To: ids@iiug.org
> From: tri_trinh@hotmail.com
> Subject: Modify initial and next extents [22848]
> Date: Tue, 22 Feb 2011 15:01:07 -0500
>
> Hi,
>
> We have few tables with high numbers of extents. Some of the tables have up to
> 50s and 60s extents, and we want to reorg the tables. Beside SQL statement to
> alter the next extent size “ALTER TABLE ttipip503104 MODIFY NEXT SIZE 360”, is
> there any way we can modify the initial and next extents of the tables and
> their indexes without unload and reload?
>
> IDS 11.50.FC8
> OS: HPUX-11.11
>
> TBLspace Report for baan:baan.ttipip503104
>
> Physical Address 18:427406
>
> Creation date 11/24/2010 11:28:57
>
> TBLspace Flags 802 Row Locking
>
> TBLspace use 4 bit bit-maps
>
> Maximum row size 92
>
> Number of special columns 0
>
> Number of keys 0
>
> Number of extents 32
>
> Current serial value 1
>
> First extent size 4
>
> Next extent size 16
>
> Number of pages allocated 3592
>
> Number of pages used 3592
>
> Number of data pages 3577
>
> Number of rows 75090
>
> Partition partnum 7341643
>
> Partition lockid 7341643
>
> Extents
>
> Logical Page Physical Page Size Physical Pages
>
> 0 7:329400 4 4
>
> 4 7:427727 4 4
>
> 8 7:428077 4 4
>
> 12 7:509595 4 4
>
> 16 7:584469 4 4
>
> 20 7:584739 4 4
>
> 24 7:585862 4 4
>
> 28 7:586026 4 4
>
> 32 7:587506 4 4
>
> 36 7:590261 4 4
>
> 40 7:593531 12 12
>
> 52 7:597216 4 4
>
> 56 7:597265 4 4
>
> 60 7:597774 12 12
>
> 72 7:930695 12 12
>
> 84 7:931251 4 4
>
> 88 7:941904 8 8
>
> 96 7:943017 8 8
>
> 104 7:1000163 280 280
>
> 384 7:1001277 16 16
>
> 400 16:14021 48 48
>
> 448 16:138067 8 8
>
> 456 16:138306 1408 1408
>
> 1864 16:140228 72 72
>
> 1936 16:378667 96 96
>
> 2032 16:386091 104 104
>
> 2136 16:769924 176 176
>
> 2312 16:813437 512 512
>
> 2824 16:814349 88 88
>
> 2912 16:897377 48 48
>
> 2960 16:944183 400 400
>
> 3360 21:1022845 232 232
>
> Index tipip5031041abaan fragment partition index1 in DBspace index1
>
> Physical Address 58:588683
>
> Creation date 11/24/2010 11:28:57
>
> TBLspace Flags 802 Row Locking
>
> TBLspace use 4 bit bit-maps
>
> Maximum row size 92
>
> Number of special columns 0
>
> Number of keys 1
>
> Number of extents 35
>
> Current serial value 1
>
> First extent size 4
>
> Next extent size 16
>
> Number of pages allocated 1952
>
> Number of pages used 1940
>
> Number of data pages 0
>
> Number of rows 0
>
> Partition partnum 9440345
>
> Partition lockid 7341643
>
> Extents
>
> Logical Page Physical Page Size Physical Pages
>
> 0 9:382431 4 4
>
> 4 53:644804 4 4
>
> 8 53:644931 4 4
>
> 12 53:645329 4 4
>
> 16 53:645643 4 4
>
> 20 53:646261 4 4
>
> 24 53:646324 4 4
>
> 28 53:646496 4 4
>
> 32 53:646517 4 4
>
> 36 53:646615 4 4
>
> 40 53:646778 4 4
>
> 44 53:646958 4 4
>
> 48 53:647031 4 4
>
> 52 53:647159 4 4
>
> 56 53:647188 4 4
>
> 60 53:647380 4 4
>
> 64 53:865362 8 8
>
> 72 53:898571 8 8
>
> 80 53:898587 8 8
>
> 88 53:924184 16 16
>
> 104 53:1023990 8 8
>
> 112 54:173987 248 248
>
> 360 54:174532 32 32
>
> 392 54:174574 696 696
>
> 1088 54:217136 24 24
>
> 1112 54:309990 32 32
>
> 1144 54:332909 88 88
>
> 1232 54:341277 584 584
>
> 1816 54:417268 8 8
>
> 1824 54:417781 8 8
>
> 1832 54:418244 16 16
>
> 1848 54:418585 8 8
>
> 1856 54:418716 16 16
>
> 1872 54:419704 48 48
>
> 1920 54:420764 32 32
>
>
> *******************************************************************************
> 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.