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06 Sep 13 - IBM data magazine - Mission Accomplished - Miami, Florida will be the backdrop for the 2014 IIUG Informix Conference... Read
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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 - - 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 - - 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
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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 - - DNS impact on Informix / Impacto do DNS no Informix... Read
8 Sep 11 - - 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
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11 Mar 11 - InvestorPlace - It's Time to Give IBM Props: How many tech stocks are up 53% since the dot-com boom?... Read
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25 Jan 11 - PR Newswire - Bank of China in the UK Works With IBM to Become a Smarter, Greener Bank... Read
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20 Sep 10 - - 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
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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
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19 May 10 - The New Blog Times - Misurare il consumo energetico: DEHEMS è pronto... Read
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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

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IDS Forum

Re: Auto Update Stats

Posted By: Nita Dembla
Date: Wednesday, 26 June 2013, at 3:30 p.m.

In Response To: Auto Update Stats (ANIL GOYAL)

On any 11.xx version lower than 11.70xC6, you would need to set tk_enab=
to "t" for all the following tasks:

Auto Update Statistics Evaluation
Auto Update Statistics Refresh

AUS Evaluator depends on the information collected by mon_table_profile=
identify the how much the tables have changed over a period of time. AU=
Evaluator uses AUS_CHANGE parameter to decide if a table qualifies for
statistics rebuild. AUS Refresher executes the update statistics on tab=
identified by the Evaluator.

You can configure when to run the AUS tasks by updating ph_task table
manually or using OAT (Open Admin Tool) graphical interface.

On version 11.70xC6 and higher, you can disable "mon_table_profile" as =
Evaluator has been revised to use partition counters. Also AUS_CHANGE h=
been deprecated.

AUTO_STAT_MODE and STATCHANGE are not directly tied to AUS feature. The=
are part of Smarter Statistics and Fragment Level Statistics features.
STATCHANGE of 10% means that a table needs a change of atleast 10% befo=
any update statistics on it will be run. The server automatically
determines this and makes a update statistics command a "no-op" if
STATCHANGE percentage is not met. You can append a "FORCE" keyword to t=
update statistics command to ignore the STATCHANGE comparison.

You can learn more about this feature from my developerWorks article - =
advantage of fragment-level statistics and smarter statistics in IBM

Nita Dembla, PMP=AE
IBM Informix Development



<dabwali312@yahoo => =

Sent by:, =

ids-bounces@iiug. =

org =


Auto Update Stats [30669] =

06/26/2013 10:26 =

AM =



Please respond to = =



Hi Team

We are working on implementation of Auto Update statistics (AUS) in our=

product using Informix database.
For that we are doing the below changes in onconfig file


As we know Auto Update Statistics (AUS) maintenance system uses a
of Scheduler sensors, tasks, thresholds, and tables to evaluate and upd=
we have 'tk_enable' column set to 'false' for mon_table_profile, Auto
Statistics Evaluation, Auto Update Statistics Refresh tables in sysadmi=

So do I need to make this coulmn tk_enable 'true' for any of the mentio=
tables to implement AUS in our product or AUS will work fine with this
values as well i.e. tk_enable=3D'F'.

Currently we have a sysagent task that update stats once per day and we=

able to see the update statistics in aus_cmd_comp table as well for tha=
particular time period (even though tk_enable is set to 'F' as mentione=
above) because we are calling the Evaluator and Refresh Externally. We =
disable this sysagent task and implement AUS.

What if I make tk_enable true only for Auto Update Statistics Evaluatio=
n &
Auto Update Statistics Refresh and not for mon_profile_table because
mon_profile_table is used by Evaluator. Since Evaluator gathers informa=

from systable, sysdistrib, syscolumns, and sysindices tables in the
database as well so what happen if I make tk_enable false for
mon_profile_table. what is the impact of that?

One more question. STATCHANGE of 10% means whenever any table stats are=

changed by 10%, the AUS will run instantly or AUS will always run at
time set in Auto Update Statistics Evaluation and determines which tabl=
updates based on the expiration policies set by STATCHANGE.

Please suggest on this



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