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Service Broker Transactions


Service Broker Transactions

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venoym
venoym
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Comments posted to this topic are about the item Service Broker Transactions
Keld Laursen (SEGES)
Keld Laursen (SEGES)
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Good question. Thanks.
Although I had never used BrokerSend before, I had done something similar on linked servers, ending up in the same error.
Konstantin Reu
Konstantin Reu
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Good question!

Explained situation is known as "Uncommitable transaction".

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Tom Thomson
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Interesting question. I haven't a clue in this area of SQL Server, but it looked like a choice between option 1 and option 3 (option 4 had to be a joke - if it were that it would be famous, but it isn't famous so it isn't that; and option 2 seemed too silly for words). Option 1 was less bizarre, so I chose that and got it wrong.

The trouble is that even with the explanation and a bit of background reading, I still don't understand it; so obviously I have a lot more reading to do. I guess that means that this QoTD will result in a fair chunk of learning, so it must be a good question.

Tom

venoym
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Yes, option 4 is a joke.

This is an uncommittable transaction, you can see outlined in the linked BOL on TRY CATCH with Transactions. I ran into the issue because of an error in a production situation where the massively complicated stored procedure started throwing the "unable to write" exception about 1 time per week. Fortunately a coworker managed to reproduce in house and we were able to identify that the Dialog ID (or conversation id) was what was invalid and causing everything else.

Working with Service Broker and XML data types can be VERY tricky when dealing with transactions as everything is a severity 16 error which causes the Uncommittable Transaction condition.
Stephanie Giovannini
Stephanie Giovannini
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So, how would you fix the posted code so that the uncommittable transaction message isn't reported?

I'm curious which COMMIT statement is causing the error. There's a COMMIT statement after the CATCH block inside the proc, and also a COMMIT in the outer transaction.

I suppose one (or both) of these should check XACT_STATE() before executing?
Sean Lange
Sean Lange
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I also don't have any experience in this part of sql but like I Tom I kind of guesses it would be 1 or 3. However answer #4 was just way too funny so I had to pick that to make sure that at least 1 person did. :-D

Interesting question about a topic I am totally unfamiliar with. Will have to come back and read on this when I get a chance.

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Interesting question. I guessed ... and guessed wrong

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venoym
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Stephanie Giovannini (3/2/2012)
So, how would you fix the posted code so that the uncommittable transaction message isn't reported?

I'm curious which COMMIT statement is causing the error. There's a COMMIT statement after the CATCH block inside the proc, and also a COMMIT in the outer transaction.

I suppose one (or both) of these should check XACT_STATE() before executing?


The easiest method to fix the error that prompted this question is to check for the Dialog ID (or Conversation ID) in the sys.conversation_endpoints system table (or view?). The error is not at a commit statement, rather at the INSERT INTO dbo.[BrokerErrors] is where it throws the Severity 16, unable to perform operations that write to the log.

Order of Exceptions:
1. SEND exception (Severity 16)
2. INSERT INTO (Severity 16) <-- this is returned to the calling SP/App, aka answer 3
SQLRNNR
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Thanks for the question.



Jason AKA CirqueDeSQLeil
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