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Make sure the load tests use test cases that simulate user load. This requires special attention when working with unit tests. You do not want to just load-test your unit tests. Rather, you want to create special-case unit tests that simulate a business transaction. This business transaction should have a similar representation from the user interface. The standard load test should be set to approximate the required number of concurrent users. It should not step up the user load. A stepped load adds more and more users to the application over time. This is great for stress testing. However, the standard load test should verify that the application works with the required user load. Ensure that the test cases are distributed to various sections of the application based on real user behavior. For example, if your users log 20 calls to get a single order, you should define a unit test for logging a call and another for taking an order. You should then set the test distribution ratio of the log call test to 95 percent and set the take order distribution to 5 percent. Verify that the load tests assume a standard set of think times. Think time represents the time a user spends thinking between requests. You can use recorded think times or a standard set. However, you do not want to turn off think times because this does not approximate real user load.

The static methods shown in Table 14-1 all return instances of a particular Assembly. Using GetAssembly or any of the Load methods allows you to load an Assembly that is not currently loaded. More interesting are the GetCallingAssembly, GetEntryAssembly, and GetExecutingAssembly calls. These methods allow you to retrieve an instance of the Assembly class for assemblies that are part of the current call stack. GetEntryAssembly returns an instance of the assembly that contains the start-up method (usually the executable assembly for a desktop application), as shown in the following example:

Figure 11-21

Figure 5-6

SELECT connect_time, connection_id, session_id, client_net_address, auth_scheme FROM sys.dm_exec_connections order by connect_time desc

return oldStream;

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The following code shows how the managed TaskbarManager.Instance.ThumbnailToolbars property can be used to achieve the same effect as the native equivalent shown earlier:

Lesson 1: Overview of Database Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315 Lesson 2: Initializing Database Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328 Lesson 3: Designing Failover and Failback Strategies . . . . . . . . . . . . . . . . . . . 335

You must stop the DNS Server service and open the WINDOWS\System32\Dns\Dns.log file in an RTF editor such as WordPad.

Ian McLean Cynics on the Internet (and they abound) list procedures that artificially raise the value of the buffer cache hit ratio and use this information to discredit the use of the counter as a diagnostic tool. Here is one such procedure:

You can add Showplan event classes to a trace definition so that Profiler gathers and displays query plan information in the trace. You can use Transact-SQL stored procedures from within your own applications to create traces manually on an instance of the SQL Server database engine.

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To create a custom MMC, open an empty MMC by clicking the Start button. Then, in the Start Search box, type mmc.exe and press Enter. The Add/Remove Snap-in command in the File menu enables you to add, remove, reorder, and manage the console s snap-ins. Practice It

To keep security needs manageable, simplify your list of stated business security requirements. Too many stated business needs require a longer list of exceptions to those requirements and make your policy difficult to manage.

Logical Location Sensor (Triangulation)

9. 10. 11. 12. 13. 14. 15.

1. You are designing a DNS infrastructure and need to decide where DNS servers should be located. You have already created diagrams, maps, and documentation of the network topology and infrastructure. Why are these elements critical in your decision-making process regarding server placement

Dim userToken As New UsernameToken(parentAssertion.UserName, _

' VB Public Overrides Sub Install(ByVal stateSaver As System.Collections.IDictionary) MyBase.Install(stateSaver) MsgBox("Install custom action executed") End Sub // C#

root scope The TransactionScope object asso-

Although defining the property is much like defining a method, the PropertyAttribute enumeration does not allow defining as many aspects of the properties as you might expect. For example, you do not specify the visibility of the property in the PropertyBuilder. Instead, you need to also define methods that perform the get or set operations on a property. The following code provides an example: