Informix News
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28 May 12 - Bloor - David Norfolk on the recent Informix benchmark "pretty impressive results"... Read
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22 Mar 12 - developerWorks - Optimizing Informix database access... Read
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1 Mar 12 - IBM Data Management - IIUG Heads West for 2012 - Get ready for sun and sand in San Diego... Read
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24 Feb 12 - developerWorks - Informix Warehouse Accelerator: Continuous Acceleration during Data Refresh... Read
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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
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20 Sep 10 - - ITG analyst paper: Cost/Benefit case for IBM Informix as compared to Microsoft SQL Server... Read
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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

Re: RE: RE: RE: Informix 12.1 Blocking Checkpoints

Posted By: Andreas Legner1
Date: Friday, 10 November 2017, at 3:51 a.m.

In Response To: Re: RE: RE: RE: Informix 12.1 Blocking Checkpoints (NATYURAL HORACIO)

Hi Horacio,

just curious: what was the parameter to change, and what was the change?

The task at hand would be catching a situation where a thread is seen 'in
critical section' for so many seconds.

I've quickly sketched a script that might help at this - haven't really
tested it, but should at least serve as a starting point.
Have it running it in an empty directory, and should it catch something and
produce outputs, provide these to tech support.

Let us know how this goes.


# Catch information once threads seen 'in critical section'
# (X flag at pos 5 in 'onstat -u' flags column) in two consecutive
# onstat -u outputs $min_crit_sect_duration seconds apart.
# Doesn't guarantee 'same critical section', but chances are it is.
# Change 'while true' if you don't want this to run for ever,
# otherwise it wouuld dump a new onstat -u every $min_crit_sect_duration
# seconds and compare with previous one, then collect session and stack
# info on threads caught repeatedly, plus full -a, -g stk all and -g ses 0
# for every interval finding at least one repeat.


while true; do

unset rstcbs1
if [ -z $rstcbs0 ]; then
onstat -u > o_u0
rstcbs0=$(awk '{if (substr($2,5,1) == "X") print $1}' o_u0)

sleep $min_crit_sect_duration

if [ -z "$rstcbs0" ]; then continue; fi
onstat -u > o_u1
rstcbs1=$(awk '{if (substr($2,5,1) == "X") print $1}' o_u1)
if [ -z "$rstcbs1" ]; then continue; fi

for r0 in $rstcbs0; do
for r1 in $rstcbs1; do

if [ $r0 = $r1 ]; then

t=$(onstat -g ath | awk '$3 ~/^'$r1'$/ {print $1}')

if [ -z $t ]; then continue; fi

if [ $n -eq 0 ]; then

onstat -a |gzip > o_a_$o.gz

onstat -g stk all | gzip > og_stk_all_$o.gz

onstat -g ses 0 | gzip > og_ses_0_$o.gz



onstat -g stk $t >> og_stk_$t

s=$(awk '/^'$r1'/ {print $3}' o_u1)

onstat -g ses $s >> og_ses_$s





Date: 11/08/2017 05:32 PM
Subject: Re: RE: RE: RE: Informix 12.1 Blocking Checkpoints [40163]
Sent by:


THnak you for this very detailed explanation regarding the critical

It's actually not that easy to catch since it happens very erratically.
We have already raised this to IBM support though. The last time that this
happened, they made us change a parameter in ononfig file.

So there seems to be no issue with the physical and logical log size as the

blocking time is non existent.

I'd like to know what commands I should throw if ever we encounter this
Is there anyway that I can know what the threads are particularly waiting



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