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In addition to the components listed previously, SQL Server 2008 provides the following new Service Broker features:
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broker Priorities Allow you to give one conversation precedence over another. Broker priorities are created by using the CREATE BROKER PRIORITY statement. Ssbdiagnose utility
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Used to analyze conversations and Service Broker services.
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Provides added analysis capabilities with the Broker TO Statistics object and five new counters added to the Broker Statistics object.
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Lesson 3: Implementing Service Broker Solutions
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GatHeRinG SeRvice bROkeR StatiSticS
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For more information about Service Broker statistics, see the articles SQL Server, Broker Statistics Object and SQL Server, Broker TO Statistics Object in SQL Server Books Online.
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Service Broker Components
The SQL Server 2008 Service Broker components can be divided into the following three major categories:
conversation components These components are created at run time and function according to the rules defined with the service definition and network and security components. A conversation exists between an initiator and a target. Conversations are long-termed, asynchronous, and reliable. Conversations are made of messages. A message can belong to one and only one conversation and is made of a specific message type. A conversation between two specific Service Broker services is called a dialog. Dialogs provide exactly once-in-order (EOIO) message delivery by managing the flow of messages between the services. Each dialog belongs to a conversation group and follows the rules specified in a contract. Conversation priorities set the relative precedence for conversations. Service definition components
You define these components as you design your
Service Broker solution:
Queues These are tables where messages are stored until they are processed. Each row in the table represents a message. When a new message is added to the queue, a row is appended to the bottom of the table. When messages are received and the RETENTION option is not specified, the messages are removed from the top of the table. Services This is the name given to the group of tasks that require messages to be sent. When a service is created, the queue that holds incoming messages is defined as part of the service definition. Contracts are associated with services to manage incoming conversations. More than one contract can be associated with a target service. If you create a service that initiates conversations but never is the target for any new conversations, you do not need to include a contract in the service definition. If a service can receive messages on the DEFAULT contract, you must specify the DEFAULT contract when you define the service. Contracts This is an agreement between two services that defines the message types the services send to accomplish certain tasks. It also defines what participants can send which message types. A contract exists in the database where it is created. If you are developing a solution that involves multiple databases, you must create an identical contract in each database that participates in the solution. The DEFAULT contract contains the DEFAULT message type. When you initiate a dialog and do not specify a contract, the DEFAULT contract is used.
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Message types This is the object that defines the name and contents of a message. Every database contains a message type named DEFAULT that uses a validation of NONE. Be careful not to confuse the DEFAULT message type with the system DEFAULT contract. In addition, you should be aware that DEFAULT is a delimited object name, not a keyword, when used to define a contract or a message type.
network and security components These components are used to define the infrastructure that allows the messages to be delivered. They are as follows:
Routes These are used to determine where to deliver messages. By default, every database contains a route to which all messages without a specific route definition should be delivered within the current SQL Server instance. This route is named AutoCreatedLocal and matches a service name and broker instance. When you define a route, you define the service name associated with the route; the broker instance identifier, which identifies a specific database where the messages should be sent; and the Network address, which contains the actual machine address or a keyword that identifies the machine that hosts the service. Remote service bindings remote databases. These are used to provide security to dialogs with
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