How To Log That A Message Has Been Retained In The Transmission_queue When The Queue Is Disabled.

Jun 16, 2007

Hi was wondering whether it is possible to log somewhere outside SB that there are messages in the transmission_queue because the Target queue was disabled.



I was testing this scenario:

try to send messages on a disabled queue and log the problem.



But the transmission_status from the trasmission_queue is always empty.



This is the code that I tried to execute between the send and the commit and after the commit:




WHILE (1=1)

BEGIN

BEGIN DIALOG CONVERSATION .....


SEND ON CONVERSATION ......


if select count(*) from sys.transmission_queue <> 0
BEGIN

set @transmission_status = (select transmission_status from sys.transmission_queue where conversation_handle=@dialog_handle);

if @transmission_status = ''

--Successful send - Exit the LOOP

BEGIN

UPDATE Mytable set isReceivedSuccessfully = 1 where ID = @IDMessageXML;

BREAK;

END

ELSE

raiserror(@transmission_status,1,1) with log;

END

ELSE

BEGIN

UPDATE [dbo].[tblDumpMsg] set isReceivedSuccessfully = 1 where ID = @IDMessageXML;

BREAK;

END

END

COMMIT TRANSACTION;

As I wrote before the @transmission_status variable is always empty and I have the same result even if I put the code after the commit transaction!



Maybe what I'm trying to reach has no sense?


With the event notification I can notify when the queue is disable because the receive rollsback 5 times but what if by mistake the target queue is disabled outside the SB environment? I can I catch it and handle it properly?

Thank you!Marina B

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Target Queue Disabled: Strange Message On The Event Viewer

Jun 15, 2007

Hello,

I have almost finished to design my Service Broker application and I found out something strange.



I was tring to handle the Target queue disabled scenario, because I want to save to message that was not sent so I can create an alert to the user to say that some messages as not been sent.



To disable to queue I run:

Alter queue [dbo].[Receivedqueue] with status = off



I had the Event Viewer in front of me and I have seen the suddenly it appeared a lot of this informational events:

Event Type: Information
Event Source: MSSQLSERVER
Event Category: (2)
Event ID: 9724
Date: 15/06/2007
Time: 15:00:47

Description:
The activated proc [dbo].[OnReceived] running on queue TestReceiver.dbo.Receivedqueue output the following: 'The current transaction cannot be committed and cannot support operations that write to the log file. Roll back the transaction.'

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.



What this message means?

I would like to avoid to have it because it appears a lot of time and I don't want to fill up my Event Viewer!!



I don't know of it is important but in the moment I executed the code there was not CONVERSING conversation and all the queues were empty.



Somebody has seen this error before or I have to send to the forum the [dbo].[OnReceived] code as well?

thankx



Marina B.

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Messages In The Sys.transmission_queue For A Disable Queue

Feb 28, 2007

I may have a misunderstanding of how SB works, but this seems like a problem.

If a queue is disable (i.e. status = off) and a message is sent to the queue the message is placed on the sys.transmission_queue. Once the queue is enabled I thought the messages were sent to the queue in the order they were placed on the sys.tranmission_queue? I have been troubleshooting a problem and this is not the case. Do I have a misunderstanding of how the sys.transmission_queue works?

The queue has retention turned off.

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Sep 27, 2007

Hi There

We do not use message retention in our application.

However today i dicovered messages still sitting in a queue, on further investigation i found that the messages had been processed, the problem was that i had mistakenly altered a queue with rentention ON earlier.

So the messages on the queue were simply retatined messages.

But i have 2 questions:

1.Is there a way to "delete" these retained messages without ending the conversation, we use permanant conversations so ending the conversation is a last resort.


2.Why is the message status of the retaitned messages 0 ?

BOL : From the topic "Message Retention"

"For queues that specify retention, the RECEIVE command sets the status of received messages to 1 rather than deleting the message."

However my retained messages have a status of 0 ? Also i have confirmed that new not yet received messages have a status of 1.

BOL : From topic "RECEIVE (Transact-SQL) "

" Message Status

0=Ready1=Received message2=Not yet complete3=Retained sent message

"

But from my testing retained = 0 and Ready = 1, is this a mistake in BOL or am i missing something ?

Thanx

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Service Queue Disabled

Jan 21, 2008



Hi all -

I have an event in my sql server 2005 box that is fired every 5 seconds. Source MSSQLSERVER event ID 9274.


The activated proc [dbo].[sp_sysmail_activate] running on queue msdb.dbo.ExternalMailQueue output the following: 'The service queue "ExternalMailQueue" is currently disabled.'

I don't know anything about this queue that is mentioned above. How do I disable this message or get rid of that queue?

TIA

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Target Queue Disabled

Mar 25, 2006

Hi,

I receive messages in my target queue but target queue continously become disabled even aften I enable and receive message it still says target queue is disabled?



Please Guide

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Jun 4, 2007

I use ALTER QUEUE statement to disable a Service Broker QUEUE then i see message -Service Queue is currently disabled every 5 sec in SQL server error Log. How can i stop this messages it is enought to see it only one time?

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Event Notification On Disabled Queue: The Conversation Must End?

Jun 19, 2007

Hello,

I have configured an Event Notification for BROKER_QUEUE_DISABLED.



I created a Queue different from the one the Receive my normal messages and on this queue I define an activation.



The Activated SP takes the [EventNotification] message and execute a

RAISEERROR('Message',0,1) WITH LOG.



The error is properly logged in the SQL server event log but I gave a look the Initiator and target sys.conversation_endpoints catalog view and I have see the the conversations are in the status CONVERSING or SI ...

Do I have to call the END CONVERSATION after the commit or these statuses are caused by some mistakes on the message process workflow?



Thank you

Marina B.

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Nov 16, 2005

Well I downloaded an example (HelloWorld) from www.SQLServiceBroker.com yesterday and it WAS working this morning, however; now I'm getting this error:

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Sep 17, 2007



I am using the Centralized Asynchronous Auditing with Service Broker article example to set up my first Service Broker attempt. We want to start logging search criteria and search results for our product search page. We wanted it to be asynchronous and be stored in another dbase, this seemed like the perfect example.

I modified the example above to save into an Audit table we created and to read a custom message that I generated the XML for. I'm pretty certain that should all work. However, I didn't change much else but I can't get the message to send.

This is the error I'm getting in profiler:
This message could not be delivered because the destination queue has been disabled. Queue ID: 197575742.

I am sending from one database to another within the same SQL server instance. Here are the profiler details
SQL:BatchStarting
EXEC dbo.usp_SendAuditData @X Microsoft SQL Server Management Studio - Query Larry APP1Larry
Broker:Conversation Group Microsoft SQL Server Management Studio - Query Larry
Broker:Conversation STARTED_OUTBOUND Microsoft SQL Server Management Studio - Query Larry
Broker:Conversation CONVERSING Microsoft SQL Server Management Studio - Query Larry
Broker:Message Classify Microsoft SQL Server Management Studio - Query Larry
Broker:Message Undeliverable This message could not be delivered because the destination queue has been disabled. Queue ID: 197575742. Microsoft SQL Server Management Studio - Query Larry APP1Larry
SQL:BatchCompleted
EXEC dbo.usp_SendAuditData @X Microsoft SQL Server Management Studio - Query Larry APP1Larry
Broker:Message Classify
Broker:Remote Message Acknowledgement
Broker:Remote Message Acknowledgement
Broker:Remote Message Acknowledgement
Broker:Message Classify
Broker:Message Undeliverable This message could not be delivered because the destination queue has been disabled. Queue ID: 197575742. sa
Broker:Message Undeliverable This message was dropped because it could not be dispatched on time. State: 2 sa
Broker:Message Undeliverable This message was dropped because it could not be dispatched on time. State: 2 sa


When I run SELECT * FROM sys.transmission_queue I get this in the transmission_status:
"One or more messages could not be delivered to the local service targeted by this dialog."


I'm hoping someone can point me in the right direciton, thanks.

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Apr 18, 2006

Ok, im making some progress. So what i have is a Message Queue Task which is bound to a message queue connection manager (which 'tests' ok). The Message Queue Task is set to recieve, variable from string message (declared a variable of type string) and to remove the message from the queue. The output of that task is piped into the data flow task.
The data flow task expands into a XML Source which is configured to get its input from the string i declared in the Message Queue Task and i point the schemas path to an appropriate schema. I then pipe the output of that into a SQL server destination which ive mapped all the columns from the XML message to a table (which the SQL server destination created for me).

It all looks good on paper, and builds properly with no errors etc. There is already a message in the appropriate private queue. When i go to debug it, it just sits on the Message Queue Task node (its yellow) and goes no further. No data is put into the DB. I have put a watcher on the link between the XML Source and the SQL server destination, and can see no data being piped through.
Even if i send another message, the execution of my package doesnt step passed the Message Queue Task. Its just sitting there waiting for something? what? I thought it would block until there was a message on that queue, and then process it if and when it arrives. But it doesnt seem to do that.

Any ideas??

I read on MSDN that you need integration services installed. I have checked and i do, and its running. Is theres something else i need to configure?

Help!

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Aug 2, 2007

Simple Question.

I have a requirement to read XML Messages from a Remote private MSMQ.
These messages are essentially Database records that will need cleaning up and insterting into a Local Database table.

Is this possible with SSIS?
Would Biztalk be a more suitable tool for this type of process?

If its possible, are there any resources taht can point me in the right direction?

Thanks for your help!
J.

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Mar 7, 2007

I have a C# application that get data (i.e. select Firstname, LastName from person) to form a DataSet object (i.e. PersonName variable inside my code). Then I want to post this DataSet object into a local private queue (the path is: .privatemyTestQ). Note that I carefully labled the message to be "Variables Message" (as needed per anothre thread discussion here in this forum).

I created a receiving package, in which I want to use SSIS's Message Queue task to retreive the above DataSet object (from C# application). I got failure:

[Message Queue Task] Error: An error occurred with the following error message: "Root element is missing.".

However, As a comparison research, I created another SSIS sending-package. And I used ADO.NET provider to get the same data to store the sull result set in a package-level variable. Then I use Message Queue task to post this variable (i.e. object) to the same private queue above. Then I run my above receiving package. I was successful to read back the messge that I posted from SSIS sending package. (Please note that if I use OLEDB provider for sending package to get data from database, the MSMQ task for sending failed due to serializtion issue for __ComObject. With ADO.NET provider, the result set is represented as a type of DataSet).



I then curiously looked into message body from Computer Management Counsol. I found that message sent from SSIS is in SOAP format while message from my C# application is NOT in SOAP (but only in XML format). Obviously SSIS MSMQ task serialize objects into SOAP format.



Can anyone here please help on how to serialize my DataSet object from my C# app) in compliance with the MSMQ task's spec so that I can read message from Q using SSIS package.



I use Visual Studio 2005 and MSMQ 3.0 version.

Your help is appreciated.

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Jun 12, 2007

Is it possible to modify the sequence of messages in a SSB queue? Or to create messages so that their sequence is based on a value in the message rather than the order in which they were sent to the queue?



I am trying to determine if SSB will help me solve a situation where BizTalk needs to process a prescribed sequence of messages that may not be received in the correct order. (i.e. I need to resequence the messages). Each message contains a field with the sequence number and also a field identifying the total number of messages in the sequence.



I realise that the Sequential Convoy Aggregrator EAI pattern can potentially provide a solution to this, or even the Sequence Guards pattern by McGeeky, but I guess I was hoping that SSB might provide a slightly more efficient solution(?)



Thanks,

Dan

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Jan 17, 2007

How To Use Message Queue Task In Integration Services

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Oct 2, 2006

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Sep 1, 2006

Hi Folks,

I've found a pretty good code example on http://www.dotnetfun.com for a Asynchronous Trigger.

I've parsed through the Code, to understand how to wirte my own Async Trigger with a Service Broker, but the Code isn't working! It seems that the stored procedure don't receive the messages in the queue, but the queue get's filled.

MessageType


 CREATE MESSAGE TYPE  myMsgXML
 VALIDATION = WELL_FORMED_XML;
Contract

CREATE CONTRACT myContractANY
 (myMsgXML SENT BY ANY)
Queue

CREATE QUEUE myQueue
 WITH STATUS = ON,
 RETENTION = ON,
 ACTIVATION
 (
  STATUS = ON,
  PROCEDURE_NAME = sp_myServiceProgram,
  MAX_QUEUE_READERS = 5,
  EXECUTE AS SELF
 )
Service

CREATE SERVICE myService ON QUEUE myQueue  (myContractANY)
Procedure (greped from http://www.dotnetfun.com/)

CREATE PROC sp_myServiceProgram
AS
-- This procedure will get triggered automatically
-- when a message arrives at the
-- Let's retrieve any messages sent to us here:
DECLARE @XML XML,
  @MessageBody VARBINARY(MAX),
  @MessageTypeName SYSNAME,
  @ID INT,
  @COL2 VARCHAR(MAX);
DECLARE @Queue TABLE (
  MessageBody VARBINARY(MAX),
  MessageTypeName SYSNAME);
WHILE (1 = 1)
BEGIN
 WAITFOR (
  RECEIVE message_body, message_type_name
  FROM myQueue  INTO @Queue
 ), TIMEOUT 5000;
 -- If no messages exist, then break out of the loop:
 IF NOT EXISTS(SELECT * FROM @Queue) BREAK;
 DECLARE c_Test CURSOR FAST_FORWARD
  FOR SELECT * FROM @Queue;
 OPEN c_Test;
 FETCH NEXT FROM c_Test
  INTO @MessageBody, @MessageTypeName;
 WHILE @@FETCH_STATUS = 0
 BEGIN
  -- Let's only deal with messages of Message Type
  -- myMsgXML:
  IF @MessageTypeName = 'myMsgXML'
  BEGIN
   SET @XML = CAST(@MessageBody AS XML);
   -- Now let's save the XML records into the
   -- historical table:
   INSERT INTO tblDotNetFunTriggerTestHistory
    SELECT tbl.rows.value('@ID', 'INT') AS ID,
     tbl.rows.value('@COL2', 'VARCHAR(MAX)') AS COL2,
     GETDATE() AS UPDATED
    FROM @XML.nodes('/inserted') tbl(rows);
  END
  FETCH NEXT FROM c_Test
   INTO @MessageBody, @MessageTypeName;
 END
 CLOSE c_Test;
 DEALLOCATE c_Test;
 -- Purge the temporary in-proc table:
 DELETE FROM @Queue;
END
Send Message in a Update Trigger

SELECT @XML = (SELECT * FROM inserted FOR XML AUTO);
  -- Send the XML records to the Service Broker queue:
  DECLARE @DialogHandle UNIQUEIDENTIFIER,
   @ConversationID UNIQUEIDENTIFIER;
  /*
   The target Service Broker service is the same
   service as the initiating service; however, you
   can set up this type of trigger to send messages
   to a remote server or another database.
  */
  BEGIN DIALOG CONVERSATION @DialogHandle
   FROM SERVICE myService
   TO SERVICE 'myService'
   ON CONTRACT myContractANY;
  SEND ON CONVERSATION @DialogHandle
   MESSAGE TYPE myMsgXML
   (@XML);
  -- Let's detect an error state for this dialog
  -- and rollback the entire transaction if one is
  -- detected:
  IF EXISTS(SELECT * FROM sys.conversation_endpoints
   WHERE conversation_handle = @DialogHandle
   AND state = 'ER')
   RAISERROR('Dialog in error state.', 18, 127);
  ELSE
  BEGIN
   --I want to list the queue after the trigger so I disabled
   --END CONVERSATION @DialogHandle;
   COMMIT TRAN;
  END
The Problem is, that the Procedure doesn't even get started! So I tried to receive the Queues manually

WAITFOR (
  RECEIVE message_body, message_type_name
  FROM myQueue  INTO @Queue
 ), TIMEOUT 5000;

and I run always into the timeout and get nothing back. A Select * FROM myQueue gives me some results back. Why I can't recevie?
Would be grateful for help, or at least a good tutorial, I haven't found one yet....
thx and greez
     Karsten

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Mar 12, 2008

I have a strange situation in an Message queue task in SSIS.
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I created an SSIS package that has an Message Queue listener that feeds into a Script task inside a for-each loop.
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When I enter the entry into the MSMQ, it goes in perfectly fine (since I also tested retrieving this entry from a C# app). However when I use the same logic on the SSIS package using the Script task, I get junk chinese characters.

Has this happened to anyone else?
Any feedback would be great!

Anup

Here is the code for the script task:
mports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Runtime

Public Class ScriptMain

Public Sub Main()
Dim statusMessage As String
statusMessage = CType(ReadVariable("ReviewerHealthXmlMessage"), String)
System.Windows.Forms.MessageBox.Show(statusMessage)
Dts.TaskResult = Dts.Results.Success

End Sub

Private Function ReadVariable(ByVal varName As String) As Object
Dim result As Object

Try
Dim vars As Variables
Dts.VariableDispenser.LockForRead(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
result = vars(varName).Value
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try

Return result
End Function

Private Sub WriteVariable(ByVal varName As String, ByVal varValue As Object)
Try
Dim vars As Variables
Dts.VariableDispenser.LockForWrite(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
vars(varName).Value = varValue
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try
End Sub

End Class

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Jun 2, 2006

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[MessageId] [uniqueidentifier] NOT NULL,
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[Status] [tinyint] NOT NULL,
[SubmittedTime] [datetime] NOT NULL,
[StartTime] [datetime] NOT NULL,
[DispatchedTime] [datetime] NULL,
[CompletedTime] [datetime] NULL,
[MessageData] [image] NULL

This is how I retrieve the next message for processing:

SELECT TOP 1 *
FROM [Queue].[MessageQueue] WITH (ROWLOCK, UPDLOCK, READPAST)
WHERE [StartTime]=@pStartTime AND [MessageType]=@pMessageType AND [Status]=@pStatus
ORDER BY [StartTime]

and mark it as being processed:

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After message has been processed I delete it from the queue:

DELETE FROM [Queue].[MessageQueue] WHERE [MessageId]=@pMessageId

All database accesses are transactional with default READ COMMITTED. The problems start when there are a few concurrent accesses: I get deadlocks when retrieving next message. If I do not delete message after processing then there is no deadlock. But this is not what I need.

I played with different isolation levels and locking hints and was able to avoid deadlock using TABLOCKX:

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But in this case you cannot concurrently retrieve messages which was my goal from the beginning. How do I achieve this?

Thank you,
Alex

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Aug 14, 2007

Hi,

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I have a problem where in if i run multiple instances of the same app ( each app creates one thread ), the threads pop out the same message and I get a deadlock upon commit.

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CREATE PROC [dbo].[queue_dequeue]
@entryId int OUTPUT
AS
BEGIN
DECLARE @conversationHandle UNIQUEIDENTIFIER;
DECLARE @messageTypeName SYSNAME;
DECLARE @conversationGroupId UNIQUEIDENTIFIER;

GET CONVERSATION GROUP @conversationGroupId FROM ProcessingQueue;
if (@conversationGroupId is not null)
BEGIN
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if @messageTypeName in
(
'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog',
'http://schemas.microsoft.com/SQL/ServiceBroker/Error'
)
begin
end conversation @conversationHandle;
end
END

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Jan 15, 2008



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Hello,
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A.
When a procedure is triggered upon reception of a message in a queue, what happens when the procedure fails and rolls back?
1. Message is left on the Queue.
2. is the worker procedure triggered again for the same message by the queue?
3. I am hoping the Queue keeps on triggering workers until it is empty.

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B.
For my scenario messages are independent and ordering does not matter.
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select [name], count(*)

from sys.dm_broker_queue_monitors qm

inner join sys.service_queues sq on qm.queue_id = sq.object_id

group by [name]


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Does anyone know why this would happen? Is this a valid state for SB?
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Jul 25, 2007

hi all!



I have 2 instances that communicate via service broker.

The conversations are only one way from initiator server1 db to target server2 db.

I also reuse dialog id's in BEGIN DIALOG @dlgId

i save @dlgId from the first run into a table and then retreive it for each message send

since the messages are constant i don't close the dialog at the target for each message.



i'm just wodering why do both sys.transmission_queue and sys.conversation_endpoints get a row

for each message i send but the transmission_status in sys.transmission_queue is emtpy.



also each conversation_handle and conversation_id is different for each row and

only one row in each sys table has the same conversation_handle as my saved @dlgId.



just wondering what is going on.



this code is done on the initiator



DECLARE @dlgId UNIQUEIDENTIFIER

-- each database has one dialog id

SELECT @dlgId = DialogId

FROM dbo.Dialogs

WHERE DbId = DB_ID()

-- Begin the dialog, either with existing or new Id

BEGIN DIALOG @dlgId

FROM SERVICE [//DataSender] -- service on initiator server

TO SERVICE '//DataWriter', -- service on target server

-- Target's Service Broker Id

'83382A22-2830-4B25-B067-15AAC255EB03'

ON CONTRACT [//Contract1]

WITH ENCRYPTION = OFF;

-- Send data

;SEND ON CONVERSATION @dlgId

MESSAGE TYPE [//Message1] (@msg)



Thanx,

Mladen

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Aug 14, 2007

Hi,

At my company, we're trying to use service broker to create a client-server system where there is a head office machine and multiple outlets registered with that head office. My problem is that sometimes when a branch sends a message to the head office, it just seems to sit in the transmission queue and never gets sent. If I run a script that forcibly ends the conversations on the client machine (with cleanup), storing the message bodies and then resend them, they seem to get through fine.

The way that we send messages is by calling a t-sql stored procedure from a c# application using SqlCommand (don't know if this should make any difference).

If I monitor the Head Office machine and one of the Outlets while this is happening, on the HO I get three events in a row:



Broker: Message Classify (1 - Local)
Audit Broker Conversation (2 - No Certificate)
Broker: Message Undeliverable (1 - Sequenced Message)
The TextData contained in the third event is: This message could not be delivered because the security context could not be retrieved.

The RoleName of the server is Initiator, and the TargetUserName is the name of the service on the Outlet.

On the Outlet I get the following event repeatedly (presumably as it continues to try sending the message) - Broker: Remote Message Acknowledgement (1 - Message With Acknowledgement Sent).

On the client the RoleName also appears to be Initiator, and the TargetUserName is blank.

This would make me suspect that certificates were missing or something, except that if I remove messages from the queue and resend them they seem to get through, and also I've checked both databases and they have the correct certificates.

Any ideas?

Thanks in advance,

Adam

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Jan 29, 2007

Sorry for the stupid question, but I can't seem to figure it out...

There are 119 messages that are stuck in the transmission queue, all for the same queue. When I check the status of the queue (via sys.service_queues), is_receive_enabled = 1, is_activation_enabled = 1, and max_readers = 3. When I check to see if there is an active queue monitor (via sys.dm_broker_queue_monitors) there is nobody watching this queue. What would cause this queue to be active, enabled but have nobody montioring it? Is there something internal that went wrong that made these (outbound) messages get stuck in the transmission queue, and is not showing up in the views? How can I get these messages "un-stuck" and flow through the system?

A problem I am seeing is the return message to this queue (to signify the target has consumed the message, and to end the conversation) are not being consumed, thus getting stuck in the "DI" state.

Any suggestions would be greatly appreciated.

Thanks in advance,

John Hennesey

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Feb 15, 2006

Are lock hints propagated to the underlying tables of system catolog views? I ask because I often query sys.transmission_queue with nolock, and I wanted to know if this was honoured through out the underlying tables.

Secondly, is sys.transmission_queue indexed at all, providing a way to prevent table-scanning?

Thanks

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Mar 26, 2007

For some reason the messages are stuck at sys.transmission_queue. The transmission status seems to be null. I verified all the Queues and they hae the values of (is_receive_enables = 1, is_enqueue_enabled = 1, is_activation_enabled = 0)

I have set up the service broker on different domain and have bidirectional ports open to receive messages.

I can send and receive messages, when I run the same service broker setup scripts at the machines that belongs to same domain .

any help appreciated.

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