Service Broker in Microsoft SQL Server 2005 is a new technology that provides messaging and queuing functions between instances. The basic functions of sending and receiving messages forms a part of a “conversation.” Each conversation is considered to be a complete channel of communication. Each Service Broker conversation is considered to be a dialog where two participants are involved.
Service broker find applications when single or multiple SQL server instances are used. This functionality helps in sending messages to remote databases on different servers and processing of the messages within a single database. In order to send messages between the instances, the Service Broker uses TCP/IP.
This transaction message queuing system enables the developers to build secure and reliable applications, which are scalable. The developers can design applications from independent components known as “services.” If the applications need to avail the functionality of these services, then it sends message to the particular “service.”
Loosely coupled applications (programs that exchange messages independently) are supported by the Service broker. The three components of the Service broker are as follows: conversation components (which consist of the conversation groups, conversations and messages); service definition components (which define the conversations); and networking and security components (defines the infrastructure used for exchanging messages between instances)
The maintenance of Service Broker is easy and it is a part of the routine database administration procedure. This is because this functionality forms a part of the Database Engine. Service Broker also provides security by preventing unauthorized access from networks and by message encryption.
More on :- http://blog.sqlauthority.com/2009/09/21/sql-server-intorduction-to-service-broker-and-sample-script/
http://msdn.microsoft.com/en-us/library/ms345108(v=sql.90).aspx
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