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Advantages of Service Broker The Advantages of the Service Broker are: Database integration provides performance enhancement; database administration is also very easy when data, messages and application logic are within the database.
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In addition, distributed transactions have a lot of overhead, which leads directly to poorly performing database applications.
Here you can see very well why an embedded messaging framework within the relational engine of SQL Server makes a lot of sense.
As you can see in Listing 5, you are receiving the message from the queue, constructing the response message, and finally sending the response message back to the initiator service.
Every opened conversation in Service Broker must be also closed on both sides — at the target service and also at the initiator service.
This means that in this example, you have sent two messages back to the initiator service, the response message, and also an end dialog message.
You can verify it very easily by querying the queue of the initiator service:. This message type is internally used by Service Broker. Listing 6 contains the code that is necessary to process the received messages.
Because you just receive one message at time you have to execute this batch two times, so that each message gets processed individually. Listing 6: Receiving a sent Service Broker message on the initiator service.
After executing this code twice, you have processed the response message, and finally also closed the conversation on the initiator service side.
Therefore the whole conversation was cleaned up and removed from memory. Congratulations, you have now successfully implemented your first Service Broker application!
In part 2 of this series we will have a more detailed look into Service Broker, where I will clarify why, and in which circumstances, the usage of Service Broker makes sense.
Stay tuned! Log in or register to rate. Join the discussion and add your comment. The second part of this series focuses on the advantages of Service Broker over other messaged-based technologies to introduce asynchronous message processing into your database applications.
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Here you search for information about which route deals with which remote Service Broker and the lifetime of the route. Expired routes are hard to debug so check here if you suspect this.
Route address can be LOCAL, TRANSPORT or the IP or DNS name of the computer. This catalog view contains a row for each contract in the database.
Not much other help you can get from this one. This catalog view contains a row for each contract-message type pair.
This one is more useful than the previous one. If you suspect that the service doesn't support the message type you expect it to support for example a typo when creating it or if you set the wrong end of the conversation to use it you can check here if you're right.
This catalog view contains a row for each message type registered in the service broker. If you suspect message validation issues this is the place to verify.
This catalog view returns a row for each reference between service and service queue. A service can only be associated with one queue while a queue can be associated with multiple services.
Since one queue can accept messages from more than one service you can check here which services are bound to which queues.
Deferred Message Processing Deferred message processing goes hand in hand with asynchronous message processing, but there is an interesting difference between these two concepts: asynchronous message processing specifies only that work is done at a later time, while deferred message processing specifies when the work is actually done.
Service Broker and SQL Server As you can see from the previous description there are a lot of advantages with message processing.
However, as with every product and technology, there are also some drawbacks, including the following: Message size is limited to 4MB. MSMQ is not installed by default.
Furthermore, you need the Windows installation disk to install MSMQ. You need distributed transactions if you want to run the message processing and data-processing logic in one Atomic, Consistent, Isolated, and Durable ACID transaction.
This requires installation of the Microsoft Distributed Transaction Coordinator MS DTC. Message ordering is not guaranteed. Message correlation is not supported out of the box.
You must implement queue readers manually. You must conduct synchronization and locking between several queue readers manually.
Backup and restoration can be a challenge, because message data and transactional data are stored in different places. Service Broker Scenarios After you have learned in the previous section why Service Broker makes sense, I want to give you a more concrete example of how you can use Service Broker within your own database applications.
Figure 1: Trigger processing may be partly synchronous and partly asynchronous As you can see from Figure 1, the only thing that the trigger does is create a new Service Broker message and send that message to the Service Broker target service.
The recommendation is to reuse conversations wherever it is possible, for the following reasons: Reusing conversations has a significant positive performance impact.
The cost of setting up and tearing down a conversation for each message can influence the performance by a factor of four. The advantage of having multiple messages on the same conversation can speed up processing on the receivers side by a factor of about The Open Service Broker API defines these interactions, and therefore allows software providers to offer their services to anyone, regardless of the technology or infrastructure those software providers wish to utilise.
Each service broker built to the Open Service Broker API specification has the same intuitive set of lifecycle commands.
These commands do useful things such as:. This model provides significant benefits for both development and operations teams:.
Service brokers compliant with the Open Service Broker API specification allow platforms to provision a new instance of a service. And the service broker provides all the information that your application or container needs to connect to the service instance.