c# ean 13 reader

c# ean 13 reader

c# ean 13 reader

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If you deploy this Service Broker scenario in your production system, all your clients will need to know is the address of the Service Broker forwarding service, forwarder.csharp.at. If you change something in your internal network topology, you just have to change the sys.routes catalog view from the forwarding services. None of your clients will have to do anything, because they re just sending messages to the forwarding service, and they have no information about where the real Service Broker services are deployed. As you can see, message forwarding can help you to decouple your clients from your internal network topology and configuration.

Note In 13, I discussed the maximum number of concurrent merge processes. A value of 0 means that an infinite number of merge processes can run at any given time. You can set the number of concurrent merge processes by using the @max_concurrent_merge parameter when calling sp_ addmergepublication (see Listing 13-8 in 13).

To view the list of owners for the agent, click the ellipsis button beside the Owner field. Click Close to return to the Job Properties window (shown earlier in Figure 14-1). Now select the Steps page as shown in Figure 14-3 to view the steps taken by the Merge Agent. The three steps that the Merge Agent executes are like those of the other agents, but the inner workings are different for each of them.

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You can also use this scenario to implement a centralized routing instance. When you implement a centralized routing instance, all clients are sending messages to one Service Broker forwarding service. This forwarding service has all available routes to the different deployed target services. This centralized routing service can also implement things such as load balancing. It would be completely transparent to your clients whether or not one target service is load-balanced. The clients just know the address of the forwarding service, nothing more. It s completely up to the administrator how the target services are deployed in the internal network.

The steps for the Merge Agent, as listed in Figure 14-3, are as follows: Merge Agent startup message Run agent Detect nonlogged agent shutdown Select step 1, as shown in Figure 14-3, and then click the Edit button. This will display the Job Step Properties window shown in Figure 14-4.

Figure 14-4. Viewing the general settings for the Merge Agent s first job step Merge Agent startup message As you can see in the figure, when the Merge Agent is executed, the first step calls a stored procedure, as follows: sp_MSadd_merge_history @perfmon_increment = 0, @agent_id = 5, @runstatus = 1, @comments = 'Starting agent.'

Another scenario where a Service Broker forwarding service provides a huge benefit is when you want to distribute the workload among several Service Broker instances. Think of a scenario where you have a hundred thousand concurrent users. (I know that this is a very rare scenario, but I want to show you that Service Broker also supports these scenarios.) If a hundred thousand concurrent users are trying to access a single target service, then the SQL Server instance hosting the target service can t possibly accept all client connections because of the maximum available TCP socket connections. The underlying operating system can t handle that number of users. However, you can spread out all the client connections to several forwarding services and have each forwarding service forward requests to a dedicated deployed target service. Which target service the incoming request is forwarded to is configured through the sys.routes catalog view. Figure 11-9 illustrates this.

Figure 9-14. An embedded analytics example For those of you utilizing Dynamics CRM, Example 9-2 shows how to take a report or dashboard similar to the one in Figure 9-14 and embed the analytics within a CRM entity, making it available on a specific record when that record is opened. The concept presented in this exercise, displaying information within a line of business application, is important to consider regardless of the business application you use.

This stored procedure is executed on the distribution database. It first accesses the MSmerge_ sessions table, which records all the historical data of the previous sessions of the Merge Agent whenever you start the Merge Agent, a new row is added to the table. By using this table, the

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