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In the existing query window, type, highlight, and execute the following code to disable the trigger and test that the drop of the table is successful:

2. You have designed a WCF service and now you wish to host it by using a Windows service. Besides creating the Windows service application, what must you do to load your new Windows service A. Add the application to the machine.config file for your server computer. B. Execute the installutil command-line utility to install the service. C. Add the application to the app.config file for your WCF service. D. Do nothing. All you need to do is create the Windows service application.

In this exercise, you create a logon trigger that can be used to lock out users from a SQL Server instance.

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To further practice and reinforce the skills you learned in this chapter, you can: Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involving the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.

Open a new query window, type, highlight, and execute the following code to create a logon trigger:

Summary

CREATE TRIGGER ddl_preventlogon ON ALL SERVER FOR LOGON AS IF IS_SRVROLEMEMBER('sysadmin',ORIGINAL_LOGIN()) = 0 BEGIN ROLLBACK END GO

Services can be hosted either on a Web server or in a managed application. Options for hosting on a Web server include hosting with IIS or WAS. When hosting with a managed application, you can use a Console application, a Windows Forms application, a Windows Presentation Foundation UI application, or a Windows service. To host simple WCF services, you can use the WCF-provided host. You can use this builtin service host with a command-line utility to host a service quickly, and it requires no extra code or supporting infrastructure.

In the existing query window, type, highlight, and execute the following code to create a login for testing:

WCF deposits logging information for internal events in a number of places. One of the locations is the Windows Event Log. However, you can configure a WCF application also to publish events into Windows Management Instrumentation (WMI). In WMI, the events can be detected and acted upon by the tools frequently used by the operations staff. This kind of monitoring fits best in companies that care deeply about monitoring their WCF services. Logging of events is enabled by default. WCF does not expose a mechanism for disabling logging, so your WCF applications can always create event log entries. For the most part, the events generated by WCF will appear in the Application Event Log. The types of events that appear include the following: Failures on message logging and tracing. Failure of the WCF TCP Port Sharing Service to start. Failure when the CardSpace service does not start. Critical events within WCF, including startup failure or unexpected service crashes.

SQL Server 2005 includes three main replication types: snapshot, transactional, and merge. SQL Server uses a magazine publishing metaphor to describe the elements of a replication topology, including articles, publications, Publishers, Distributors, and Subscribers. Replication involves one of two types of subscriptions: push subscriptions, which run at the Distributor and send the publication to the Subscribers; and pull subscriptions, which run at the Subscribers and retrieve the publication from the Distributor. Replication uses executables called agents to manage the replication process. The main replication agents are the Snapshot Agent, the Log Reader Agent, the Distribution Agent, the Merge Agent, and the Queue Reader Agent.

3. 4.

Attempt to log on using the account that you just created. Disable the trigger, and then attempt to log on again:

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