IBM Mainframe Forum Index
 
Log In
 
IBM Mainframe Forum Index Mainframe: Search IBM Mainframe Forum: FAQ Register
 

Typical problem in CICS TSQ


IBM Mainframe Forums -> CICS
Post new topic   Reply to topic
View previous topic :: View next topic  
Author Message
Satya786

New User


Joined: 02 Feb 2006
Posts: 7
Location: Denmark

PostPosted: Wed Aug 13, 2008 7:20 pm
Reply with quote

Problem: User logon to the system and typed the transaction to view the amounts on the screen.The amounts are incorrect. After a minute he once again typed the same transaction and found that the amount details were correct.
They reported the problem.

Investigation: The program write the data into the TS-Queue from DB2 and populates into the screen.The data displayed as an error is the data of different user.
Progam related checks done: Initialiation,writing into the queue,picking data from database is absolutely OK.
Queue related checks done: The TS-queue name is defined as terminal-id + transaction ID.When shifting for present screen screens the queues are deleted.

Can anybody guide me what else can I need to check if this type of problem occur.
Back to top
View user's profile Send private message
Earl Haigh

Active User


Joined: 25 Jul 2006
Posts: 475

PostPosted: Wed Aug 13, 2008 7:34 pm
Reply with quote

Depending upon how your programs write the TSQ;

If TS-queue is termID+transactionID, then if 2 different users
are using the same terminal, seems to me this could occur.


This requires reveiwing your program(s) logic. Good Luck !
Back to top
View user's profile Send private message
Satya786

New User


Joined: 02 Feb 2006
Posts: 7
Location: Denmark

PostPosted: Wed Aug 13, 2008 7:51 pm
Reply with quote

Do you think that same terminal can be used by 2 different users at a time...!!
Back to top
View user's profile Send private message
Robert Sample

Global Moderator


Joined: 06 Jun 2008
Posts: 8700
Location: Dubuque, Iowa, USA

PostPosted: Wed Aug 13, 2008 7:54 pm
Reply with quote

Quote:
Problem: User logon to the system and typed the transaction to view the amounts on the screen.The amounts are incorrect. After a minute he once again typed the same transaction and found that the amount details were correct.
Sounds like the delete of the TSQ is in the wrong place. Definitely a program logic error!
Back to top
View user's profile Send private message
Earl Haigh

Active User


Joined: 25 Jul 2006
Posts: 475

PostPosted: Wed Aug 13, 2008 8:03 pm
Reply with quote

Do you think that same terminal can be used by 2 different users at a time...!!


I certainly have never seen 2 users on same terminal at the same
time.

But I have seen more than 1 user use the same terminal at different times. Often within in minutes of each other.

You have a program logic problem. REVIEW your logic and fix it.
Back to top
View user's profile Send private message
CICS Guy

Senior Member


Joined: 18 Jul 2007
Posts: 2146
Location: At my coffee table

PostPosted: Wed Aug 13, 2008 9:05 pm
Reply with quote

If the network autogenerates the LU name and CICS autoinstalls the four character terminal name based upon the eight character LU name, dups can occur.
Different connected regions will allow the dups to exist in a common region, not as termids, but as part of the queue naming scheme.
Back to top
View user's profile Send private message
Satya786

New User


Joined: 02 Feb 2006
Posts: 7
Location: Denmark

PostPosted: Fri Aug 15, 2008 11:41 am
Reply with quote

This problem occured after 6 years of the system is installed...
Back to top
View user's profile Send private message
dbzTHEdinosauer

Global Moderator


Joined: 20 Oct 2006
Posts: 6966
Location: porcelain throne

PostPosted: Fri Aug 15, 2008 12:08 pm
Reply with quote

and absolutly nothing has changed.
Back to top
View user's profile Send private message
Satya786

New User


Joined: 02 Feb 2006
Posts: 7
Location: Denmark

PostPosted: Fri Aug 15, 2008 1:35 pm
Reply with quote

Yes, there is no change in the system, not touched these programs, and around 30 users use this system every day..
Back to top
View user's profile Send private message
Robert Sample

Global Moderator


Joined: 06 Jun 2008
Posts: 8700
Location: Dubuque, Iowa, USA

PostPosted: Fri Aug 15, 2008 4:58 pm
Reply with quote

Quote:
there is no change in the system, not touched these programs
Actually, something changed. It could be an operating system upgrade, CICS upgrade, terminal emulator change, VTAM change, system program change or something application related but working programs just don't suddenly change their behavior. If the behavior has changed, you need to find out what could be the cause and assuming that there's been no change in the system is not the way to start.
Back to top
View user's profile Send private message
Earl Haigh

Active User


Joined: 25 Jul 2006
Posts: 475

PostPosted: Fri Aug 15, 2008 5:56 pm
Reply with quote

Robert is correct, something in the enviornment has changed, and the
programs have a bug that has always been there.


Use a debugger' to resolve the problem or hire a consultant.
Back to top
View user's profile Send private message
dick scherrer

Moderator Emeritus


Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix

PostPosted: Fri Aug 15, 2008 7:45 pm
Reply with quote

Hello,

Quote:
Yes, there is no change in the system,
There may have been no intentional change, but (to echo the others) something has changed.

Is there a record of when this first happened? By chance the Monday after some weekend "unrelated" hardware/software addition/upgrade?

Knowing exactly when the problem behavior started may be a big help in determining what triggered these inconsistencies.

As was also mentioned, the problem is not new, just not discovered 'til now.
Back to top
View user's profile Send private message
Bill O'Boyle

CICS Moderator


Joined: 14 Jan 2008
Posts: 2501
Location: Atlanta, Georgia, USA

PostPosted: Fri Aug 15, 2008 8:27 pm
Reply with quote

In order to write exclusive TSQ Queue's for a given user, you could switch to using the 16-Byte TSQ-Name option instead of the default 8-Byte name, which would then allow greater TSQ-Name uniqueness, using a format of 'USERID+EIBTRNID+EIBTRMID' or whatever format you choose.

I know this doesn't answer your question as to why this TSQ error is suddenly occurring.

Just a thought....

Regards,

Bill
Back to top
View user's profile Send private message
kick_support

New User


Joined: 09 Mar 2006
Posts: 2
Location: Peoria, IL

PostPosted: Sat Aug 16, 2008 12:54 am
Reply with quote

Just a far-fetched thought...

Have there been any changes to the system to delete CICS terminals after a period of inactivity? This could result in temp queues using the termid/transid naming convention getting stranded which could later be picked up if the same terminal ID is assigned to a different user via autoinstall.
Back to top
View user's profile Send private message
Garry Carroll

Senior Member


Joined: 08 May 2006
Posts: 1205
Location: Dublin, Ireland

PostPosted: Mon Aug 18, 2008 1:02 pm
Reply with quote

Again, a possibility....

Is there any chance that some working-storage is not re-entrant? Saw a similar problem a few years ago where a PL/1 program had STATIC variables declared. This seemed to work fine until two users executed simultaneously and one overwrote the other's working storage.

Garry.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic View Bookmarks
All times are GMT + 6 Hours
Forum Index -> CICS

 


Similar Topics
Topic Forum Replies
No new posts MacKinney Batch to CICS upgrade causi... CICS 7
No new posts Associating a USERID with a CICS-Libe... CICS 0
No new posts omegamon for cics -UNSUPPORTED ENVIRO... CICS 2
No new posts Help needed in automation cics transa... CLIST & REXX 1
No new posts How to Login in to cics region and is... CICS 9
Search our Forums:

Back to Top