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 - - 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
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 - - 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
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 - - 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

[ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum

LRU *less* aggressive??

Posted By: Cesar Inacio Martins
Date: Monday, 29 April 2013, at 7:41 a.m.

Hi ,

ifx 11.50FC9X6 , AIX 6.1

*My questions* :
1) The engine auto tunning, is smarter to make LRU less aggressive?
(making dirty LRU higher).
2) Is possible make the auto tunning "more aggressive" ?? (please, read
bellow to understand the context of my question)

This last week we have problem with the battery of one controller of our
storage , naturally we lost the write cache.
All this was solved by IBM support where become to replace the battery this

The problem occurred for 6 days and during this days , was reflected
directly on the performance of our database flush.
When the write cache of the storage works fine , our checkpoints average is
15 seconds (non-blocking) , when we lost the write cache this flush
downgrade to 5-15 minutes.... blocking sometimes.

This make our RTO (120 seconds) not be reachable and for each checkpoint an
alert of performance advise + LRU auto tunning was showed , something like

243678 04/28/13 00:05:27 Performance Advisory: The time to flush the
bufferpool 205.1 is longer than RTO_SERVER_RESTART 120.
243679 04/28/13 00:05:27 Results: The server cannot meet the RTO policy.
243680 04/28/13 00:05:27 Action: Automatically adjusting LRU flushing to
be more aggressive.
243969 04/28/13 06:12:08 Performance Advisory: The time to flush the
bufferpool 221.3 is longer than RTO_SERVER_RESTART 120.
243970 04/28/13 06:12:08 Results: The server cannot meet the RTO policy.
243971 04/28/13 06:12:08 Action: Automatically adjusting LRU flushing to
be more aggressive.

Now the battery already OK and our checkpoints back to 15 seconds average.

The engine will be smart to notice that? and start come back the LRU to old
configuration? And if the case, trying avoid flush data by LRU ?

Although we suffer 6 days with this problematic checkpoints, I do not
change any configuration "on-fly" , keep the configurations to see if the
engine will try solve by self the problem. (RTO = 120, AUTO_LRU = on ,
AUTO_CKPT = on , LRU_min_dirty=40, max_dirty=60 ).

After 6 days with constant problem, for each checkpoint what trespass the
RTO mark the message was printed on online.log and the LRU is downgrade.
What I mean is, the engine auto tunning not able to solve the problem in 6
days running 24x7, check bellow.
Our configuration have 512 LRUs and buffers of 110 GB 4k + 40 GB of 8k.
During this 6 days , the engine downgrade the LRU dirty to 6-10% and
neither this way able to do a unique LRU write .

Now the battery already OK , this is the output of onstat -F :
| Fg Writes LRU Writes Chunk Writes
| 2 0 572093179

(the FG write occurred when the battery "died" )

So... *My questions* :
1) The engine auto tunning, is smart to make LRU less aggressive? (to
back the original configuration)
2) Is possible make the auto tunning "more aggressive" ?? (lowering the LRU
dirty faster ...)

The reason of my question 1 is because, IF the engine able to start do a
LRU flushing (which not occurred in this case) and avoid the performance
problem during the checkpoint, when we solve the battery , they will keep
the configuration? since I not able to back my LRU_dirty to 40-60%
manually....without bounce the engine.
The reason of my question 2 is because the auto tuning not reach they
objective in 6 days... this is too long... should be done in hours....



[ Post Response ] [ Return to Index ] [ Read Prev Msg ] [ Read Next Msg ]

IDS Forum is maintained by Administrator with WebBBS 5.12.