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

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IDS Forum

Threads waiting on buffers

Posted By: John Bejarano
Date: Monday, 3 November 2003, at 11:15 a.m.

Ok, so Informix tech support and I haven't been able
to figure this one out. I'm hoping someone else is
familiar with this problem and knows how to fix it.

Every now and then, often while we are experiencing
peak load, but not necessarily, our Informix engine
gets into a state where a huge number of users all of
a sudden begin waiting on a single buffer in the
buffer cache. Turns out this buffer page contains a
BTREE page for an index on the systables table in the
system catalog for our main database. Specifically,
the last page (alphabetically) of the index 'tabname'
on systables which contains keys on (tabname, owner).

When running onstat -b or onstat -X, the waiters on
this buffer seem to all appear, disappear, and
reappear, but when you run onstat -u, a HUGE number of
threads always have the 'B' flag for waiting on a
buffer. Needless to say, the entire database's
performance goes in the tank when this happens. One
time, the stack traces seemed to indicate that a ton
of threads were attempting to build a referential
constraint, but no such SQL commands were issued by
any thread. Plus, other times, the stack traces have
not necessarily shown this, but this may be related to
the appear/disappear/reappear thing we see on these
waiters in onstat -b and -X.

Our dbclients are configured with their own connection
pool managers. Any time they need additional
connections to accomplish something on the database,
they establish new connections. Thus, while we
usually have between 1000 and 1500 connections total
from all of the dbclient machines, the number of
connections will usually shoot up over 3500 when this
problem occurs (since the original ones do not respond
quickly any longer). Virtual memory usage goes up
concomitantly as well.

Most of the time, the database will not pull out of
this state. Usually, we need to bounce the engine in
order to get it out of this. The one time it did come
out, we were trying to have Informix dial in to look
at it while it was in progress, and it cleared up
before they could connect. There was no appearant
reason why it cleared up, but this was the ONE time
that this occurred when we were not experiencing peak
load. When we bounce the engine during one of these
episodes, as there is so much activity, the logical
recovery can take up to 10 minutes or so to complete.
While it does seem to occur most often with peak load,
we have experienced other times when load was even
higher, and we had no problems.

The engine is IDS 7.31.UD1XF running on Solaris 9.
The box is an 8-way Sunfire 4800. I have 800,000
buffers configured. (I'd raised it in a couple of
steps from 300,000 hoping that that would relieve this
issue.) We do have in place the LRUAGE=1 fix to
prevent BTREE pages from taking up all the buffers.
We have 100 LRU queues and MAX and MIN set to 2 and 1,

We are about to go into our peak season, and having an
unstable database is really freaking out my
management, not to mention me. Any help or insight
that anyone can offer would be GREATLY appreciated.
I'm losing sleep on this one. Thanks very much.

--John Bejarano
DBA, Shutterfly, Inc.

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