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IDS Forum

Remote LONGTX with no userthread in 9.30 UC6 W4

Posted By: Gentsch, Sam
Date: Monday, 17 May 2004, at 4:42 p.m.

...forgive the long copy, but it has been a while, I'll post at the top to save you time...

What is the difference in the following commands?
onmode -H <address> forget heuristically completed transaction
onmode -Z <address> heuristically complete specified transaction

The admin guide says the -Z places an ENDTRANS (after a ROLLBACK) into the logical log, but what does the -H do?

Would the -Z have also worked in the scenario of the following post?

(I recently had the same situation, and the -H did the trick. I just found the section in the Admin Guide -The Heuristic Rollback Scenario this and am wondering if I did the right thing and what to do next time!).

Sam Gentsch

>Message 3 in thread
>From: Jonathan Leffler
>Subject: Re: Remote LONGTX with no userthread in 9.30 UC6 W4
>> rdtbra wrote:
>>> We use here IDS 9.30.UC6W4, running in SunOS 5.7. Both Informix
>>> and Solaris are 32 bits. For the second time we have reached a
>>> situation where the instance shows a LONG TRANSACTION marked with
>>> flags --H--G and userthread 0. When this instance is started,
>>> after the fast recovery it instantly is signed as OnLine (LONGTX)
>>> and the second header line shows the instance as blocked.
>>> On our message file, there is an indication of a distributed
>>> transaction as follows:
>>> 17:42:04 Aborting Long Transaction: tx 0x83dceef8 no user info due to
>>> XA or distributed (2-phase commit) transaction
>>> 17:42:04 Aborting Long Transaction: tx 0x83dced28 no user info due to
>>> XA or distributed (2-phase commit) transaction
>>> 17:42:04 Session completed abnormally. Rolling back tx id 170, flags
>>> 0x108463b
>>> 17:42:04 Session completed abnormally. Rolling back tx id 80, flags
>>> 0x108463b
>>> 17:58:09 Aborting Long Transaction: tx 0x83dceb58 no user info due to
>>> XA or distributed (2-phase commit) transaction
>>> After this, the instance is blocked, and the following appeared in our
>>> message log:
>>> 20:29:30 Logical Recovery has reached the transaction cleanup phase.
>>> 20:29:30 Logical Recovery Complete.
>>> 0 Committed, 0 Rolled Back, 3 Open, 0 Bad Locks
>>> 20:29:31 Dataskip is now ON for all dbspaces
>>> 20:29:32 Checkpoint Completed: duration was 1 seconds.
>>> 20:29:32 Checkpoint loguniq 109671, logpos 0x15018
>>> 20:29:32 Maximum server connections 0
>>> 20:29:32 Blocking on XA transaction, tx 0x83dceb58, till it is
>>> cleaned up.
>>> 20:29:32 Blocking on XA transaction, tx 0x83dced28, till it is
>>> cleaned up.
>>> 20:29:32 Blocking on XA transaction, tx 0x83dceef8, till it is
>>> cleaned up.
>>> 20:29:32 On-Line Mode
>>> The only solution was to call 24x7, and the problem was solved. They
>>> used an utility to clear the transactions.
>>> Unfortunatelly there was a second occurrence yesterday. Additional
>>> information:
>>> Applications using Oledb with .NET.
>>> Applications using ODBC.
>>> Applications using ESQL/C.
>MTS - M$ Transaction Server/Service? Is anything on the client side
>using that?
>>> The only distributed transaction is a .NET application that opens two
>>> connections with the same instance but two different databases.
>Do you know if any other database servers are involved? Or is it all
>strictly local to the current IDS server?
>Of itself, two separate connections are simply two separate
>connections, but .NET might be making them into one XA transaction.
>In which case, the question is - why is the XA coordinator dying? Or,
> roughly equivalently - who is turning off their PC and not
>restarting it? Or who's machine is BSoD'ing and not rebooting in a
>timely manner? Who's cleaning lady pulls the plug out from their PC
>each night?
>>> Does anyone has any ideas of what might be causing this situation?
>> What does onstat -x show? This will detail the actual transaction.
>> Ensure that all you distributed transactions use the TCP connections
>> from server to server.
>> onmode -H 0x83dceef8
>> might have worked in this situation.
>> onmode -H <address> forget heuristically completed transaction
>These suggestions are, I think, reasonable.
>Heuristic rollbacks are inherently unsatisfactory, but until you know
>why the XA coordinator is not around, it may be your best workaround -
>more satisfactory than having Informix support come in to do that.
>Although the errors mention two phase (distributed) transactions,
>unless there is another IDS server that could also be in use - and it
>would be having recovery problems too, and it would be the coordinator
>system for the transactions - then the problem is that the XA
>coordinator is dying and not reappearing in a timely manner. And, as
>I suggested, that sounds like a PC using MTS that is not shutting up
>shop properly - nor restarting reliably. Since the problems happened
>in the evening (quarter to six; eight o'clock0), this is a
>semi-plausible hypothesis.
>I wonder; could the XA coordinator be on a DHCP host, which doesn't
>get the same IP address when it is restarted? That could screw things
>up totally. I don't know whether IDS would allow a different IP
>address to identify the original GTRID and close the transaction, or
>whether IDS would say "well, that GTRID was not originated by your
>(new DHCP) IP address, so I can say I know nothing about the XA TX; we
>can presume it was aborted", while still waiting for the original IP
>address to ask about the GTRID - or say that it was rolled back.
>Jonathan Leffler #include <disclaimer.h>
>Guardian of DBD::Informix v2003.04 --

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