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While it is possible to view the undelivered commands in the Replication Monitor, the overhead cost of retrieving them this way can be high. It is possible, however, to retrieve the same information by querying the distribution database. Listing 15-8 shows how you can find out whether the commands have been delivered or not. Listing 15-8. Finding the Number of Undelivered Commands /* Execute this on the distribution database */ Use distribution Go select a.agent_id, a.UndelivCmdsInDistDB, a.DelivCmdsInDistDB, b.name, b.publisher_db, b.publication from MSdistribution_status a,MSdistribution_agents b where a.agent_id=b.id and b.publication='pub_mysales_copy_myinventory' and b.name= 'BIOREPL\BIORE-mysales_copy-pub_mysales_copy_myin-BIOREPL\BIORE-17' go This script determines how many commands have been delivered and how many are still left undelivered for the publication and the Distribution Agent (b.name) servicing the publication. The two tables used are MSdistribution_status and MSdistribution_agents. This script needs to be executed on the distribution database. The output is as follows: Agent_id UndelivCmdsInDistDB DelivCmdsInDistDB Name Publisher_db Publication ---------------------------------------------------------------------------------17 0 10 BIOREPL\BIORE-mysales_copy-pub_mysales_copy_myin-BIOREPL\BIORE-17 mysales_copy pub_mysales_copy_myinventory 17 0 5 BIOREPL\BIORE-mysales_copy-pub_mysales_copy_myin-BIOREPL\BIORE-17 mysales_copy pub_mysales_copy_myinventory 17 0 5

The first place to look for an error is your application message queue. A lot of times the conversation experienced an error and the reason is given in an error message enqueued in your application s service queue. But too often the application will simply consume this error message silently. Later when investigating the problem, you find yourself facing a real mystery: the messages sent have vanished without a trace; there is nothing to be investigated. Whenever you re faced with such a scenario, the first place to look is the application code itself more than likely, it is consuming error messages from the queue silently and not reporting anything. After you convince yourself that the application itself is not silently consuming error messages, the next place to look is the sys.transmission_queue view on the database from where the messages are sent. This view shows all messages that are pending delivery to their destination services by Service Broker. Every message sent will be kept in sys.transmission_queue until it is acknowledged by the destination service.

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BIOREPL\BIORE-mysales_copy-pub_mysales_copy_myin-BIOREPL\BIORE-17 mysales_copy pub_mysales_copy_myinventory 17 0 5 BIOREPL\BIORE-mysales_copy-pub_mysales_copy_myin-BIOREPL\BIORE-17 mysales_copy pub_mysales_copy_myinventory 17 0 5 BIOREPL\BIORE-mysales_copy-pub_mysales_copy_myin-BIOREPL\BIORE-17 mysales_copy pub_mysales_copy_myinventory You can see that there are no commands left to be delivered. Although we have validated the data for replication, validation merely provides a success or failure result. It does not tell us whether there are any differences between the source and the destination tables. At this stage, you should check to see whether there are indeed any differences between the source and destination tables. To do this, you have to use a utility tool called tablediff. You will find the executable in this directory: C:\Program Files\Microsoft SQL Server\100\COM. Figure 15-21 shows a list of the parameters for the utility.

Booked revenue (new market)

Listing 15-9 shows how you can use tablediff to find out whether there is any nonconvergence between the publication database, mysales_copy, and the subscription database, mysalescopy_ stpub_remotepush, for the Item table. You need to run the utility for each of the articles to ensure that there is no data nonconvergence. In this example, both databases are running on the same server instance, BIOREPL\BIOREPL_PEER. The parameters used for tablediff in this example are listed in Table 15-1. Listing 15-9. Checking for Nonconvergence Between the Publication and Subscription Databases /* Run from the command prompt */ tablediff -sourceserver BIOREPL\BIOREPL_PEER -sourcedatabase mysales_copy -sourcetable Item -sourceschema myinventory destinationserver BIOREPL\BIOREPL_PEER -destinationdatabase mysalescopy_stpub_remotepush -destinationtable Item destinationschema myinventory -f C:\files\tabledifferencepeer.sql -o C:\files\tablediffoutput.txt

Service Broker keeps a status for every conversation that has a message pending. The status is normally empty, but if the message cannot be transmitted, Service Broker will fill this status with the error information explaining why the message cannot be transmitted. This status information is reset before each attempt to send a message again on the conversation. The sole purpose of this status information is for troubleshooting and debugging, as it is not used internally by Service Broker. The function GET_TRANSMISSION_STATUS can be used to retrieve the transmission status of any conversation, and the view sys.transmission_queue projects this function result for all pending messages as the transmission_status column.

Table 15-1. Parameter Settings for tablediff in Listing 15-9

sourceserver sourcedatabase sourcetable sourceschema destinationserver destinationdatabase destinationtable destinationschema f o

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