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Informix News
29 July 09 - Wall Street Journal - IBM to Acquire SPSS, Adding to Acquisitions... Read
11 February 09 - InformationWeek - IBM Drifts Slowly Toward Mainstream Cloud Computing... Read
11 February 09 - CNNMoney.com - IBM to Deliver Software via Cloud Computing With Amazon Web Services... Read
07 January 09 - Huliq News - IBM Power Servers Helps Bank of Chengdu Build Up Core Banking System.. Read
04 December 08 - Steeleye - Multicarta achieves 99.997% uptime for its Informix-based Credit Card Authorization Centre... Read
16 October 08 - VendorRate - Informix Earns Top Customer Satisfaction Score on VendorRate in Q3... Read
14 August 08 - IIUG.org - Sellout Expected for the 2009 IIUG Informix Conference... Read
29 April 08 - IntelligentEnterprise.com - IBM Informix Upgrade Enhances Clustering, Database Management... Read
29 April 08 - itweek.com - IBM 'Cheetah 2' mauls data costs... Read
28 April 08 - eWeek.com - IBM Uncages Cheetah 2 Data Server... Read
28 April 08 - CNNMoney.com - IBM Helps Clients Reduce Data Management Costs With New Informix Dynamic Server... Read
09 April 08 - CNNMoney.com - MediaSpan Embeds IBM Informix Dynamic Server Software for Delivering News to Print, Web and Wireless Devices... Read
08 April 08 - IT-Director.com - Informix seeks developers... Read
18 February 08 - marketwire.com - Icarus Studios Partners With IBM to Upgrade Performance, Availability for Its Online Games... Read
17 January 08 - eWeek.com - IBM Adds Mac Support to IDS for Higher Education... Read
17 January 08 - informationweek.com - Lotus Notes For iPhone Signals Closer Ties Between IBM, Apple... Read
16 January 08 - marketwire.com - IBM Informix Dynamic Server to Deliver Support for Mac OS X... Read
16 January 08 - internetnews.com - IBM's IDS to Support Mac Platform... Read
28 June 07 - REG Developer - IBM and Informix tie down Cheetah... Read
27 June 07 - CBRonline.com - IBM corrects its own Informix customer figures... Read
14 June 07 - vnunet.com - IBM changes spots with Informix 'Cheetah' database... Read
14 June 07 - eChannelLine - IBM expands scope for IDS... Read
14 June 07 - Resellernews - IBM: Informix database alive and kicking... Read
13 June 07 - DB2 Magazine - Cheetah is now out of the gate... Read
12 June 07 - IBM - IDS 11 release announcement (pdf)... Read
12 June 07 - ChannelWeb Network - IBM Uncages IDS 11, Aka Cheetah, Database... Read
12 June 07 - eWeek.com - IBM's 'Cheetah' Ready to Pounce... Read
12 June 07 - InformationWeek - IBM Unleashes 'Cheetah' Database... Read
12 June 07 - WebWire - IBM Strengthens Database Portfolio With New Informix Dynamic Server... Read
12 June 07 - Intelligent Enterprise - IBM Unveils Informix Upgrade... Read
12 June 07 - ComputerWeekly.com - IBM's Cheetah IDS makes leap to better data centre clustering... Read
12 June 07 - ebiz - IBM Unveils Next Generation Informix Dynamic Server... Read
12 June 07 - computerworld.com - Will 'Cheetah' help IBM's Informix chase down market share?... Read
12 June 07 - Internetnews.com - No Data Can Outrun This 'Cheetah'... Read
12 June 07 - de.internet.com - IBM neuer Datenbank-Server mit Codenamen Cheetah ist fertig... Read
12 June 07 - verifox.de - IBM stärkt Datenbank-Portfolio mit neuem Informix Dynamic Server... Read
12 June 07 - golem.de - Informix 11 vorgestellt... Read
12 June 07 - Computerwoche.de - IBM stellt neue Informix-Version vor... Read
12 June 07 - IBM.de - IBM stärkt Datenbank-Portfolio mit neuem Informix Dynamic Server... Read
12 June 07 - Heise - IBM gibt Informix 11 frei... Read
25 May 07 - Taiwan.CNET.com - Local Taiwan Informix user group established... (Chinese language) ... Read
18 May 07 - ChannelWeb Network - IBM Musters Partners For Cheetah Release... Read
18 May 07 - eWeek.com - IBM Looks to 'Cheetah' to Speed Up Blade Servers... Read
7 May 07 - DB2 Magazine - SQL Shortcuts - Use these tricks to generate IDS SQL scripts... Read




End of Support Dates
IDS 7.31 - 30 Sep 2009
IDS 9.40 - 30 Apr 2009
IDS 10.00 - 30 Sep 2010
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IDS Forum

Re: Digital UNIX V4.0F + 7.31.FD1 Performance

Posted By: TILMAN MODEL-BOSCH
Date: Wednesday, 27 June 2007, at 4:37 a.m.

In Response To: Re: Digital UNIX V4.0F + 7.31.FD1 Performance (ROBERT LANGHAMMER)

There is an issue in 7.3x BUFFER management which may cause performance problems.

In 7.3x Informix introduced a new concpet of priorisation of buffers according to the page type on top of the old 'LRU' concept. Within in this concept Index branch pages have a higher proiority than data pages. This may leads to a situation where nearly all buffers are occupied by INDEX pages, and very little are left over for data pages - leading to a very small effective size of the BUFFER. Now when users attempt to read new data, they constantly swap out each others data pages. This situation usually builds up over time and is more likely in dtabases with many, large, broad indexes .

You may use 'onstat -P' (capital P) to get an inidcation whether that's your probelm, if the summry shows a very high percentage of btree pages, you probably hit this problem.
Another hint is, when 'onstat -R' reports high number of MED_HIGH and HIGH Buffers.

You may restore the old behaviour by setting the undocumented env variable NOLRUPRIO to 1 before starting IDS, however, I recall there used to be problems with that as well which got fixed only in later IDS version 7.31.FD7 - PTS 161710 .

Alternatively you may set the equally undocumented variable LRUAGE, which causes the priority of all buffers to get downgraded periodically and also avoid that issue. Set either of the two variables to 1 (but not both at the same time) before you start oninit.

Please let us know whether that helped.

Apart from that 7.31.FD1 is really old and has some serious bugs - I suggest to contact IBM Informix support and get a newver version.

(not sure what the latest 7.31.FDx is for True64)

Rgds

Tilman

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