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Erik Stahlhut

CURSOR Service Distribution

Latest News: NSI changes to CURSOR-XPS

We have combined our service and support capabilities for high-performance databases with the system-oriented tool development of Nonne & Schneider.

Starting July 4th, 2024, you can find us under one roof: CURSOR Expert Solutions GmbH.

CURSOR Expert Solutions will seamlessly continue all business activities of Nonne & Schneider, but will also take over the development of the CURSOR Admin-Scout. Our extensive portfolio of services and support will in future be offered via CURSOR Expert Solutions.

This consolidates our expertise in Solution Management, both personnel-wise and organizationally, at one location. The executive board will be expanded with Erik Stahlhut, and „XPS“ will remain as a subsidiary within the CURSOR Software AG group in Giessen.

For customers and partners of CURSOR Service Distribution, initially, little will change. All active contracts and agreements remain valid. Your points of contact do not change.

All service offerings available on our website will continue to be available.
The contact details remain the same, just get in touch with us.

             
 

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  • Administration for all installation sizes. Standard, remote or standby administration, up to 24x7 availability for systems with high availability.

  • Individual adjustments to the service levels of our customers with short response times and personal contact persons in support.

Discover more about Informix Monitoring with the CURSOR Service Distribution!
 

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  • CURSOR Service Distribution is a long-standing IBM High-Value Service Provider for IBM Informix.

  • Specially for Informix we offer additional online seminars, workshops and training courses.

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  • The Informix tool right from CURSOR Informix Support.

  • Developed by administrators for administrators.

    With a background of over 25 years of Informix support, administration and system-oriented programming, we have been developing and distributing the Admin Scout since 2015.

  • By our Managed Service approach, the Admin Scout is suitable for almost all application areas of the Informix database system. Our customers are IT departments and administrators in commerce, banks, universities, trade and industry.

 
 
 
 

About us

the CURSOR Service Distribution

  • High-Value Service Provider for IBM Informix.

  • Distribution for IBM Data-Management Software (OEM/ASL/ESA licensing for ISVs).

CURSOR Service Distribution is a business unit of CURSOR Software AG, resulting from the acquisition of the Informix and development tool specialist "Nonne & Schneider" at the end of 2005.

We offer extensive technical services for IBM Informix, and as a high-value service provider we are the direct contact for all our customers' service needs for these databases.

Our services are independent from licensing through our company. Well-known customers rely on our monitoring and use our tools, while licensing and update maintenance are contracted directly with IBM.

 

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    For 30 years the name CURSOR has stood for excellent customer and business process management - CRM and BPM. We measure our success by the satisfaction and market success of our customers. Learn more about successful CRM projects directly from our customers.

 
 
Latest versionsfixlist
14.10.xC11 FixList
12.10.xC16.X5 FixList
11.70.xC9.XB FixList
11.50.xC9.X2 FixList
11.10.xC3.W5 FixList
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Informix - Problem description

Problem IT00315 Status: Closed

11.70.XC1/2 CONVERSION TO XC3 OR HIGHER FAILS TO START UP BTREE SCANNER
THREAD(S) IF INSTANCE IS STARTED WITH ONINIT -S

product:
INFORMIX SERVER / 5725A3900 / B70 - IDS 11.70
Problem description:
It is expected behavior that when an instance of IDS is started 
with the oninit -s command (or the onmonitor->Mode->Startup 
equivalent), it will not start the btree scanner thread(s). 
When converting an IDS instance from 11.70.xC1/2 to 11.70.xC3 or 
higher, it goes through special conversion code.  When this 
special conversion code is complete, it marks the instance as 
OnLine and starts the dbScheduler threads but it does not start 
the btree scanner thread(s). 
 
The above scenario in and of itself is not fatal.  But because 
it does not start the btree scanner threads, it also does not 
initialize the necessary btree scanner structures in shared 
memory.  And because it does not initialize the btree scanner 
shared memory structures, there are some side effects: 
 
1) Because the btree scanner thread is responsible for removing 
deleted index keys and keeping indices from becoming severely 
bloated and therefore less efficient, this can lead to 
performance problems. 
2) A query of the sysmaster:sysshmhdr pseudo table directly 
references the uninitialized btree cleaner memory structure and 
will segv and crash the IDS instance (example stack is included 
later in the description) 
3) The onstat -C command will not work, reporting only "Changing 
data structure forced command termination". 
 
After the fact, any of these problems can avoided by starting 
the instance before conversion with "oninit" or by taking the 
instance offline after conversion (assuming started with oninit 
-s) and bringing it back up with "oninit".  Simply starting the 
btree scanner thread(s) with onmode -C start will also crash the 
IDS instance. 
 
dbScheduler has a task called mon_profile which is enabled by 
default to run every 4 hours.  This task does a query of the 
sysmaster:sysshmhdr pseudo table which will induce the crash. 
The crash looks something like this: 
 
20:55:10  Assert Failed: Exception Caught. Type: MT_EX_OS, 
Context: mem 
20:55:10   Who: Session(127, informix@, 0, 0x4ddf5088) 
		Thread(141, dbWorker2, 4ddb6e00, 20) 
		File: mtex.c Line: 416 
20:55:10   Action: Please notify IBM Informix Technical Support. 
20:55:10  Raw hex dump of stack located in 
/home/informix/tmp/af.4756d8e.rawstk 
20:55:10  Stack for thread: 141 dbWorker2 
 
 base: 0x000000005063f000 
  len:   135168 
   pc: 0x0000000001317a03 
  tos: 0x0000000001c2a030 
state: running 
   vp: 20 
 
afstack 
afhandler 
affail_interface 
mt_ex_throw_sig 
afsig_handler 
<signal frame> 
prshmhdr 
pstread 
pst_rsread 
rsread 
fmread 
readseq_single 
gettupl 
scan_next 
insert_next 
doinsert 
excommand 
sq_execute 
mi_exec 
ph_execute 
do_sensor 
db_sch_worker 
udrlm_clang_execute_internal 
udrlm_clang_execute 
udrlm_exec_routine 
udr_execute 
dbsched_start_udr 
th_init_initgls 
startup
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* users converting from 11.70                                  * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Update to IDS-11.70.xC9                                      * 
****************************************************************
Local Fix:
Solution
Problem Fixed In IDS-11.70.xC9
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
13.03.2014
09.12.2016
09.12.2016
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
12.10.xC4.W1 FixList
12.10.xC5 FixList
12.10.xC5.W1 FixList