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Pro SQL Server 2005 Service Broker (Expert's Voice) by Klaus Aschenbrenner

By Klaus Aschenbrenner

Seasoned SQL Server 2005 provider dealer by means of Klaus Aschenbrenner, a global specialist on provider dealer, explains why Microsoft brought provider dealer and describes its benefits over previous message applied sciences. wealthy with sensible examples, this can be the main whole and incisive ebook in this vital new technology—an useful source for all critical database and net builders. desirous about top practices, it explains intimately how carrier dealer helps and complements database and net functions. This e-book not just covers provider dealer basics, but in addition addresses present an important themes like service-oriented structure (SOA) and service-oriented info structure (SODA).

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Extra resources for Pro SQL Server 2005 Service Broker (Expert's Voice)

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Because of this problem, a Service Broker dialog always has two services, each associated with a queue. This means that Service Broker always knows how to inform both ends of a dialog when an error occurs. This is called symmetric error handling. Anatomy of a Service A Service Broker service is a named endpoint to which messages from other services are sent. A Service Broker service has the following characteristics: • The interface is defined through the messages it can receive and send. • Services embody both application logic (code) and state (data).

As the third step illustrates, as soon as the message arrives on the TargetService, the message is put in the TargetQueue where the message waits for further processing. In the meantime, an acknowledge message is sent back to the InitiatorService, so that the sent message can be deleted from the transmission queue on the sender’s side. In the fourth step, a service program—normally implemented as a stored procedure or an external application—is started that reads the message from the queue and processes it accordingly.

As soon as the endpoint of a Service Broker service is reconfigured and points to a new address, the clients send messages transparently to the new location, without any intervention from an administrator. This could be helpful when you need to take a service offline during maintenance work. Distributed Systems If you must implement or support a distributed topology for your application, then a message-based approach can help you achieve the necessary functionality. Architectures are referred to as distributed when software components are running on different servers on the network.

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