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For troubleshooting, the most important column in this view is transmission_status If Service Broker cannot send a message, this column will contain the reason why Anything other than a blank transmission_status value indicates a problem and your message will not even leave the database until the problem is solved Here are some of the most common errors: The target service name could not be found Ensure that the service name is specified correctly and/or the routing information has been supplied There is no route for the destination service Create the necessary route The session keys for this conversation could not be created or accessed The database master key is required for this operation There is no database master key or it cannot be accessed by Service Broker Create a database master key and ensure the service master key encryption of the database master key exists.

BIOREPL\BIOREPL_PEER mysales_copy Item myinventory BIOREPL\BIOREPL_PEER mysalescopy_stpub_remotepush Item myinventory C:\files\tabledifferencepeer.sql C:\files\tablediffoutput.txt

Dialog security is not available for this conversation because there is no remote service binding for the target service Create a remote service binding, or specify ENCRYPTION = OFF in the BEGIN DIALOG statement There is no REMOTE SERVICE BINDING for the target service Create a REMOTE SERVICE BINDING Dialog security is unavailable for this conversation because there is no security certificate bound to the database principal (Id: 1) Either create a certificate for the principal, or specify ENCRYPTION = OFF when beginning the conversation A certificate is required for the user with the ID specified in the error message Create or import the necessary certificate Any other error that happens in SQL Server during message delivery can be caught by the Service Broker, including out-of-memory errors, database integrity errors, disk space errors, and operating system errors.

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The -f switch is used to generate a SQL file that will help to fix the data on the subscription server so that it matches that on the publishing server. If there is data convergence, the SQL file will not be generated, as you will see in this case. The -o switch is used to generate an output text file.

Note In the preceding example, I used Windows Authentication to connect to the server instance. If you

A comprehensive list of all errors that can appear in transmission_ status is not possible If the transmission_status column of a message is blank, it means the message can be sent Note that Service Broker may periodically erase the transmission_status column before attempting to transmit a message again Therefore, the status may be blank for a short time but set itself back to an error message shortly You shouldn t worry that there is a problem with the transmission_status column unless it stays blank for a long period of time Also when you re making configuration changes, Service Broker will not react to all of them immediately Most configuration changes are detected by Service Broker only on a periodic interval of 15 seconds, so when investigating an issue and making a change, don t be alarmed if the system does not appear to react to your change.

When you run the tablediff utility, it will list the parameters and their corresponding values on the command prompt, as shown in Figure 15-22.

It will react to it the next time it checks for configuration changes; for some changes, that may take up to a minute To validate that Service Broker is indeed sending the message, use the Profiler application attached to the sending SQL Server instance Each time a message is sent, an event of class Broker:Remote Message Acknowledgement with subclass 1 Message with Acknowledgement Sent is fired by Service Broker, and this event will appear in Profiler To make sure that the profiler event is indeed for the conversation you are investigating, use the GUID column of the profiler event to verify that it has the expected conversation ID value, because there might be other Service Broker activity in the system Once you ve ensured that Service Broker is indeed sending the messages, you should focus on the message recipient instead of the message sender.

Figure 15-22. Executing the tablediff utility If you open the output file, you will see the result of the execution, as shown here: Table [mysales_copy].[myinventory].[Item] on BIOREPL\BIOREPL_PEER and Table [mysalescopy_stdtranpub].[myinventory].[Item] on BIOREPL\BIOREPL_PEER are identical. The requested operation took 0.417 seconds. In this example there is no data nonconvergence, so the SQL file was not generated. If you don t specify the -sourceschema and -destinationschema parameters, you will get an error message, as shown in Figure 15-23.

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