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Queue names are not sent in message headers, so they are just SQL Server object names with the same collation rules as normal SQL Server objects Queues are also contained in SQL schemas, unlike the Service Broker metadata objects, so they can be referenced with three-part names You can ignore the ACTIVATION options for now because I ll explain them later The STATUS option allows you to specify whether the queue should start handling messages as soon as it s created You might want to create queues with STATUS set to OFF to keep them from getting filled up before you re ready, but be sure to use ALTER QUEUE to turn on the queue when you want to process messages The RETENTION option controls whether all messages should be kept until the conversation is ended .

When RETENTION is ON, all messages going both directions in a conversation are kept in the queue until the conversation ends Turning on RETENTION might be useful if you need to back out a long-running business transaction by running compensating transactions The messages will allow you to track what you have done so far so that you know what you have to undo RETENTION can sometimes be useful for debugging an application also Generally, I would advise you to use RETENTION with extreme caution With RETENTION ON, the queue will get very big very fast and performance might degrade significantly The ON <filegroup> option tells Service Broker where to create the hidden table to store messages Queues normally don t get too big unless RETENTION is ON or the application that receives messages is not running for a while .

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You might want to consider not putting queues in the DEFAULT filegroup and instead put them in their own filegroup This will keep a sudden growth in a queue from using all the free space in one of the critical filegroups Because a queue is built on an internal table, there is no limit to how big a queue can become other than available disk space A key thing to remember is that all queues have the same schema You are not allowed to add your own columns to a queue Although defining your own message structure in a queue might seem like an attractive option, much of Service Broker s ability to rapidly transfer and manage messages in a dialog relies on the fact that Service Broker always knows the structure of a message and a queue .

To enable multiple views of the same information To reuse the components used to generate the interface

For example, if only one type of message could be sent in a conversation (because a queue could only hold one message structure), message ordering would be much less effective because a single order might be sent to three or four different queues In this case, the application would have to assemble an order from different queues with messages arriving in a different order on each queue, making the application logic much more complex Most of the columns in a Service Broker queue are self-explanatory and well documented in SQL Server Books Online, but a few are worth describing in a little more detail The status column records the state of a message in the queue When it is first inserted the status is 1, which means it is ready to be received .

After it has been read, if RETENTION is turned on, the status is set to 0, meaning it has been received and processed by the application and the transaction has been committed If RETENTION is not on, you won t see this status because the message is deleted as soon as it is processed A status of 2 means the message has been.

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