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This means that the work that was done prior that implementation synchronously inside the trigger is now done outside of the trigger in an asynchronous fashion.
Therefore the trigger will have less of a performance impact. As you can also see, this Service Broker solution implements a one-way messaging between the database trigger and the message processing logic that is implemented in a Service Broker service.
With this pattern the target service never sends any message back to the initiator service. The only question that arises from this pattern is whether you want to start a new conversation for each message sent or if you want to reuse Service Broker conversations?
The recommendation is to reuse conversations wherever it is possible, for the following reasons:. The asynchronous trigger in this example uses the SessionConversations table to store opened Service Broker conversations so that they can reused at a later time.
Listing 1 shows the creation of our sample database and the definition of this table. As you can see from listing 1, the SessionConversations table stores the conversation handle tied to the combination of a SPID, the initiator service, the target service, and the contract.
Figure 2 shows the Service Broker objects that are needed for this example. Figure 2: The necessary Service Broker objects for that solution.
Listing 2 shows you the definition of those Service Broker objects that you have to create in the AsynchronousTrigger database. After you have created the needed Service Broker objects, you also have to register some SQLCLR assemblies that are implementing the asynchronous message processing of the database trigger.
You have to change the location of the. DLL files accordingly to your local setup. Listing 3 shows the necessary DDL statements that import the SQLCLR assembly from the local file system and register the Managed Stored Procedure ProcessInsertedCustomers.
Listing 4 shows the T-SQL code for a database trigger called OnCustomerInserted , which is defined on the Customers table that is also created in Listing 4.
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Related Tags. NET Communication SQL. A Service Broker service consists of at least the following four objects that are also created as native database objects:.
The message type describes the content of the messages that are exchanged between Service Broker services. Each message type is associated with a unique name.
When you are sending messages across databases, you have to define the identical message types in each participating database.
Each message type can be associated with a validation method that Service Broker applies to messages of that type. Service Broker currently supports the following four validation options:.
Service Broker performs the validation as soon as a message is received at a service. If an error occurs, an error message is returned back to the sender.
After you have defined the necessary message types, you must group them together into contracts. A contract defines in which direction message types are exchanged between Service Broker services.
A contract is therefore an agreement that states which message types a service can send and which message types a service can accept. Service Broker supports the following three sending directions:.
Contracts also have to be defined in all participating databases, when you are sending messages across different databases.
After you have defined your message types and your contracts, you have to create the queues for storing incoming messages in Service Broker.
Queues must be defined for both the initiator and for the target service, even when you are implementing one-way messaging with Service Broker.
The reason for this is that Service Broker also sends some messages internally e. Each received message is represented as row in a queue. A queue is internally implemented as a hidden table which uses a special locking mechanism.
The messages that are placed in the queue can be selected by using a standard SELECT query. The SELECT statement will not modify the queue and remove the messages.
To read and pull the messages from the queue, you can use the RECEIVE Transact-SQL statement. The reference documentation for Service Broker is included in the SQL Server This reference documentation includes the following sections:.
Data Definition Language DDL Statements Transact-SQL for CREATE, ALTER, and DROP statements. This catalog view is your first stop when troubleshooting Service Broker.
If an acknowledgement returns successfully then the message will disappear from the view. If your message doesn't reach its destination look at this catalog view to see what happened.
This catalog view holds a row for each conversation that the Service Broker participates in. If messages can't reach the other end look here so see the state of the conversation which must be 'Conversing' for proper two way functioning.
This catalog view contains a row for each conversation group. You won't be using this one much since the same information is available in sys.
This catalog view contains a row for each remote service binding. Remote service bindings are used for implementing dialog security.
This means that you can view which service is bound to which user and which permissions. If you suspect problems with dialog security this is the 2nd place to look in after sys.
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