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received out of order, so it can t be processed until the missing messages arrive A status of 3 means the message was sent from the end of the dialog associated with this queue and then copied into the queue because RETENTION is ON Sent messages won t appear in the queue unless RETENTION is turned on With RETENTION turned on, an extra copy of the sent message is inserted into the queue This is another reason RETENTION hurts performance The priority column influences the order that messages are received Service Broker receives messages in priority order, but in the SQL Server 2005 release, priority is always 0 and there s no way to change it SQL Server 2008 includes a feature to assign priorities to conversations .

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When MVC is implemented correctly, individual components are independent of one another. A clock is a perfect example of this. The model, or mechanism for keeping time, functions the same regardless of the use of a digital or analog view.

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Conversations enforce message ordering, so priority within a conversation would be meaningless because messages have to be processed in order no matter what the priority is The priority column in the queue is intended to set the relative priority of conversations In SQL Server 2005, the best way to implement priority processing is to send high-priority messages to a different queue than low-priority messages and then allow the application to process them appropriately This approach generally entails not processing messages from the low-priority queue unless the high-priority queue is empty However, be careful when you design this, because getting the behavior you want means dealing with starvation of the low-priority queues if there are enough high-priority messages to consume all your resources You ll also have to make sure that processing a low-priority message doesn t keep you from seeing a high-priority message arriving .

The last two queue columns worth commenting on are queuing_order and message_sequence_ number These columns often cause confusion because they appear to be the same thing The queuing_order column is the order that the message was placed on the queue regardless of the conversation to which it belongs The message_sequence_number column is the order of the message within its conversation This is the order that gets enforced when messages are received by an application You might see gaps in the queuing_order values because Service Broker might skip messages so they will be received in message_sequence_number order Service Broker queues created with the CREATE QUEUE command hold messages that are ready to be received and processed When Service Broker needs to store messages temporarily before they reach their final destination, it puts them in the systransmission_queue view There is one systransmission_queue in every database The structure of the sys.

transmission_queue is a little different from the other queues because the Service Broker needs more information to send a message over the network If possible, Service Broker will put a sent message directly on the destination queue This is generally possible if the destination queue is in the same SQL Server instance as the sender, but it won t be possible if the destination is in a different instance Service Broker has an internal routine called the classifier, which decides what to do with messages The classifier will put a message in the systransmission_queue in the following cases:.

In a J2EE presentation layer, one or more servlets usually act as the controller. They accept requests from clients, perform some processing on the model, and return an appropriate view. In some simple and other poorly designed systems, the servlet itself may render the view. This involves embedding static content like HTML tags directly in the servlet code, and is frowned upon by all of us for its shortsightedness. A far superior approach is to have your controller servlet select an appropriate JSP as the view and forward processing to it. JSPs are far more maintainable and can make use of custom tags and JavaBeans to decouple much of the logic from the static content in your pages. This is the preferred presentation layer architecture referenced in the JSP specification (where it is called Model 2). Figure 5.5 illustrates the overall concept.

The destination is in a different SQL Server instance . The destination queue is disabled STATUS = OFF . The most common cause of this is a poison message on the queue . See the Poison Messages section later in the chapter for more information .

The Service Broker is disabled in the database where the destination queue is . This is generally caused by a database being attached or restored without the ENABLE_BROKER option . The destination is unknown . Reliable, asynchronous delivery can t fail just because the destination isn t known . The message will hang around on the sys.transmission_queue and be reclassified periodically until the destination is configured or the conversation lifetime expires .

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