tailieunhanh - Microsoft SQL Server 2005 Developer’s Guide- P7

Microsoft SQL Server 2005 Developer’s Guide- P7:This book is the successor to the SQL Server 2000 Developer’s Guide, which was extremely successful thanks to all of the supportive SQL Server developers who bought that edition of the book. Our first thanks go to all of the people who encouraged us to write another book about Microsoft’s incredible new relational database server: SQL Server 2005. | Chapter 4 SQL Server Service Broker 119 the SQL Server Service Broker subsystem to enable functionality in several other areas of SQL Server 2005 including Notification Services Reporting Services and asynchronous query notifications. The SQL Server Service Broker is completely integrated with the SQL Server 2005 engine and is fully transactional. Transactions can incorporate queued events and can be both committed and rolled back. In addition the new SQL Server Service Broker also supports reliable delivery of messages to remote queues. This means that information sent via SQL Server Service Broker can span multiple SQL Server systems and still provide guaranteed in-order one-time-only message delivery even to remote queues that must be reached across multiple routing steps. The SQL Server Service Broker will take care of the mechanics required to break the large messages into smaller chunks that are sent across the network and then reassemble them at the other end. You can see an overview of the SQL Server Service Broker architecture in Figure 4-1. Messages Messages are the core bits of information that are sent by a SQL Server Service Broker application. These messages can be text messages or consist of binary data or XML. For XML messages SQL Server can validate that the messages are well formed and that they comply with a predefined schema. You create a SQL Server Service Broker message by running the CREATE MESSAGE TYPE command which is where you specify the type of content that the message will have. The messages that are sent across the queues can be very large up to 2GB. SQL Server Database SQL Server Database Figure 4-1 SQL Service Broker Architecture 120 Microsoft SQL Server 2005 Developer s Guide Queues SQL Server Service Broker queues contain a collection of related messages. Each queue is associated with a service. When a SQL Server Service Broker application sends a message that message must first be placed in a queue. Likewise when that message is .

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