Random delays with tpacall

Dear friends,
we do have an issue that sometimes result in a random delay. We haven't thoroughly invesitigaded this, so there might be some bad conclusions made in the scenario described below
We're using Tuxedo 11.1.1.2.0 and DB2 9.7
When we're doin' two sequential tpacall's (with TPSIGRSTRT only) to 2 services (A and B) (implemented in the same server) doin' some SQL-operations to a DB2-database. It usually works well, but once in a while it seems like the there's a delay for about 1 second before the service(s) is/are processed. When we digged a little deeper into this, the delay seemed to occur when the call to service B ended up in the server before the call to service A
In this case, the services just read some data so, as a quick and dirty workaround, we called the services with TPSIGRSTRT | TPNOTRAN and the "random" delay disappeared. This "workaround" is not desirable (in a SOA-architecture) and may not even be applicable all the time
As I wrote above, we haven't really digged in to this problem, so DB2 might be the one to blame as well, the answer may lay in how the two products work togehter (perhaps releaded to xa_reg vs ax_reg ?)
Have anyone experienced something like this ? Does anyone have an explanation ? Can it be a defect (in implementation or design) in one of the products ?
Best regards,
Kristian

Hi Kristian,
When you say 2 services implemented in the same server, you mean the same server executable, or the same server instance, i.e., how many copies of the server are running? If there are multiple copies of the server running, are they in the same group? Also, are the servers in a transactional group, i.e., one with an OPENINFO string and build against an DB2 as an RM? The reason I ask this second question is that when in a transactional group, Tuxedo maintains and manages the connection to the RM. In non-transactional groups, it is up to the application to manage the connections.
You say the services just read some data, so there should be no dependencies in the database between the two such as readying cursors or the like?
If all you changed was to add TPNOTRAN, then I suspect it may be a DB2 issue. One way to check is to enable XA tracing and see if DB2 is calling back with an ax_reg() call in the execution of either service. If DB2 is calling Tuxedo with ax_reg(), then DB2 thinks you are modifying the state of the database and is trying to join a global transaction. This still doesn't explain the delay, although the timestamps on the traces may help. TSAM Plus would also be able to potentially help identify the cause of this problem, or at least the culprit responsible for the delay.
One other possibility is that if you are doing this a lot, say thousands of times a second, then you may be hitting the global transaction table lock hard enough to cause some serious contention issues. But again, I'm not sure why a 1 second delay.
Do you know if the delay only occurs when service B gets processed before service A?
Regards,
Todd Little
Oracle Tuxedo Chief Architect

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