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If you decide to roll back a transaction, remember that everything is rolled back. Therefore, if you want to log the error, you have to do it after the rollback is complete. If you choose not to roll back the current transaction, you have the following two options: End the conversation with an error and commit the transaction: This is the normal way to handle permanent errors, such as poison messages. In most cases, if one message in a conversation can t be processed, the whole conversation can t be completed successfully. Commit the RECEIVE statement to remove the message from the queue, but continue the ongoing conversation: This is only appropriate if the conversation can complete successfully without processing this message. A typical example might be an error that must be resolved manually but doesn t prevent the business transaction represented by the dialog from completing successfully. In this case, you must roll back the work that was done without rolling back the RECEIVE part of the transaction. You can achieve this with a savepoint. You can create a savepoint with the SAVE TRANSACTION T-SQL statement. After receiving the message, a savepoint is established in the current transaction so that you can roll back the following work without rolling back the RECEIVE statement. If the error is a permanent error, such as a primary key constraint violation, the message is saved in a log table, the message processing is rolled back to the savepoint of the transaction, and the RECEIVE statement is committed to the database. Listing 3-26 shows you how you can implement error handling with a savepoint in your service program. Listing 3-26. Error Handling with a Savepoint DECLARE DECLARE DECLARE DECLARE @ch UNIQUEIDENTIFIER @messagetypename NVARCHAR(256) @messagebody XML @responsemessage XML;

Note After Windows NT 4.0, the Performance Monitor was renamed as the System Monitor. In Vista, it is

You can start the System Monitor by selecting Run from the Start menu, typing perfmon, and clicking the OK button. If you are using Vista, open the Reliability and Performance Monitor window, and select Performance Monitor as shown in Figure 17-1.

WHILE (1=1) BEGIN BEGIN TRANSACTION WAITFOR ( RECEIVE TOP (1) @ch = conversation_handle, @messagetypename = message_type_name, @messagebody = CAST(message_body AS XML) FROM TargetQueue ), TIMEOUT 60000 IF (@@ROWCOUNT = 0) BEGIN ROLLBACK TRANSACTION BREAK END

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While the list of performance counters can be found in the System Monitor tool, it is also possible to list the names of the performance objects and their corresponding counters by using the sys.dm_os_performance_ counters dynamic management view. To find the performance objects for replication, you can execute the following script: Use master go select * from sys.dm_os_performance_counters where object_name like 'SQLServer:Replication%' This is the output:

Figure 4-7. To add a chart, select Chart from the Report Items menu and drag it to the Design surface.

SAVE TRANSACTION MessageReceivedSavepoint IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c03/RequestMessage') BEGIN BEGIN TRY -- Store the received request message in a table INSERT INTO ProcessedMessages (ID, MessageBody, ServiceName) VALUES (NEWID(), @messagebody, 'TargetService') -- Construct the response message SET @responsemessage = '<HelloWorldResponse>' + @messagebody.value('/HelloWorldRequest[1]', 'nvarchar(max)') + '</HelloWorldResponse>'; -- Send the response message back to the initiating service SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c03/ResponseMessage] ( @responsemessage ); -- End the conversation on the target's side END CONVERSATION @ch; END TRY BEGIN CATCH IF (ERROR_NUMBER() = 1205) BEGIN -- A deadlock occurred. -- We can try it again... ROLLBACK TRANSACTION CONTINUE END ELSE BEGIN -- Another error occurred. -- The message can't be processed successfully ROLLBACK TRANSACTION MessageReceivedSavepoint PRINT 'Error occurred: ' + CAST(@messagebody AS NVARCHAR(MAX)) END END CATCH END

object_name counter_name instance_name cntr_value cntr_type MSSQL$BIOREPL_TEST:Replication Agents Running Queuereader 0 65792 MSSQL$BIOREPL_TEST:Replication Agents Running Merge -775 65792 MSSQL$BIOREPL_TEST:Replication Agents Running Distribution -1 65792 MSSQL$BIOREPL_TEST:Replication Agents Running Logreader 1 65792 MSSQL$BIOREPL_TEST:Replication Agents Running Snapshot 0 65792 MSSQL$BIOREPL_TEST:Replication Merge Uploaded Changes/sec BIOREPL\BIOREPL_TEST-mysales_merge-pub_download_mysalesm-BIOREPL\BIOREPL_TEST-5 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Downloaded Changes/sec BIOREPL\BIOREPL_TEST-mysales_merge-pub_download_mysalesm-BIOREPL\BIOREPL_TEST-5 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Conflicts/sec BIOREPL\BIOREPL_TEST-mysales_merge-pub_download_mysalesm-BIOREPL\BIOREPL_TEST-5 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Uploaded Changes/sec BIOREPL\BIOREPL_TEST-mysales_merge-pub_download_mysalesm-BIOREPL\BIOREPL_TEST-4 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Downloaded Changes/sec BIOREPL\BIOREPL_TEST-mysales_merge-pub_download_mysalesm-BIOREPL\BIOREPL_TEST-4 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Conflicts/sec BIOREPL\BIOREPL_TEST-mysales_merge-pub_download_mysalesm-BIOREPL\BIOREPL_TEST-4 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Uploaded Changes/sec BIOREPL\BIOREPL_TEST-mysales_mergestdartic-pub_mysales_mergestdaBIOREPL\BIOREPL_TEST-2 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Downloaded Changes/sec BIOREPL\BIOREPL_TEST-mysales_mergestdartic-pub_mysales_mergestdaBIOREPL\BIOREPL_TEST-2 0 272696576 MSSQL$BIOREPL_TEST:Replication Merge Conflicts/sec

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