TAILIEUCHUNG - Microsoft SQL Server 2008 R2 Unleashed- P201

Microsoft SQL Server 2008 R2 Unleashed- P201:SQL Server 2005 provided a number of significant new features and enhancements over what was available in SQL Server 2000. This is not too surprising considering there was a five-year gap between these major SQL Server 2008 is not as much of a quantum leap forward from SQL Server 2005 | 1994 CHAPTER 49 SQL Server Service Broker Now that you have a sense of what you can accomplish with this utility you should take some time to explore it further by monitoring the status of a conversation of the service you set up in the XBikeDistribution database. Further information is available in the MSDN article ssbdiagnose Utility. Related System Catalogs A few of the system catalogs and dynamic management views DMVs might be of interest to you if you re debugging Service Broker applications or simply seeking a greater understanding of how Service Broker works under the hood. Let s take a look at some of them. You ve already seen which is used to store undelivered messages in a particular database. This table is very useful because it provides the reason a message is undeliverable in transmission_status the date sent in enqueue_time a conversation identifier conversation_handle contract and service names service_contract_name to_service_name from_service_name and more. Another useful catalog is which holds the definitions of the queues defined in a particular database. It has a few interesting columns activation_procedure This column contains the name of the activated service program that is bound to the queue. max_readers This column contains the integer value specified in the CREATE QUEUE of MAX_QUEUE_READERS. is_retention_enabled This column contains the Boolean value of the RETENTION flag in CREATE QUEUE. You can use the value in the object_id column to figure out which queue is being referenced in a particular error message such as the following which you may find in your transmission queue someday This message could not be delivered because the destination queue has been disabled. Queue ID 325576198. This error occurs when your activated code throws an error in its body after receiving a message rolls back the receive is activated again and so on until Service Broker intervenes and disables the queue. It usually

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