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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.

infrequently. As is often the case, there is a trade-off between up to date and fast. The following query requests the shortest path between Los Angeles and New York:

SELECT * FROM dbo.RoadPaths WHERE from_city = 'LAX' AND to_city = 'JFK';

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:.

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empid qty rownum B G J H C D K E I A F 100 1 100 2 100 3 150 4 200 5 200 6 200 7 250 8 250 9 300 10 300 11

This query generates the following output:

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 .

from_city to_city distance path --------- ------- ----------- ---------------------LAX JFK 2945 .LAX.DEN.MCI.ORD.JFK.

The problem becomes substantially more complex when you need to assign row numbers according to a nonunique sort column and using no tiebreaker, with a preSQL Server 2005 set-based technique. For example, given the table T1, which you create and populate by running the code in Listing 4-4, say you are supposed to produce row numbers based on col1 ordering.

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 .

A more ef cient solution to the shortest paths problem uses loops instead of recursive CTEs. It is more ef cient for reasons similar to the ones described earlier; that is, in each iteration of the loop you have access to all previously spooled data and not just to the immediate previous level. You create a function called RoadsTC that returns a table variable called @RoadsTC. The table variable has the attributes from_city, to_city, distance, and route, which are self-explanatory. The function s code rst inserts into @RoadsTC a row for each (city1, city2) and (city2, city1) pair from the table Roads. The code then enters a loop that iterates as long as the previous iteration inserted rows to @RoadsTC. In each iteration of the loop the code inserts new routes that extend the existing routes in @RoadsTC. New routes are added only if the source and destination do not appear already in @RoadsTC with the same or shorter distance. Run the following code to create the RoadsTC function:

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