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The Security tab is available only when the DNS server is also a domain controller. This tab allows you to control which users are granted permissions to view, configure, and modify the DNS server and its zones. By clicking the Advanced button, you can further refine settings related to DNS server permissions. Figure 5-11 shows the Security tab.

Automatic Memory Management (Garbage Collection)

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The same as calling GC.Collect with no flag . Today, this is the same as passing Forced, but this may change in a future version of the CLR . Forces a collection to occur immediately for all generations up to and including the specified generation . The garbage collector will only perform a collection if the collection would be productive either by freeing a lot of memory or by reducing fragmentation . If the garbage collection would not be productive, then the call has no effect .

Here's an example:

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Under most circumstances, you should avoid calling any of the Collect methods; it s best just to let the garbage collector run on its own accord and fine-tune its generation budgets based on actual application behavior However, if you re writing a console user interface (CUI) or graphical user interface (GUI) application, your application code owns the process and the CLR in that process For these application types, you might want to suggest a garbage collection to occur at certain times using a GCCollectionMode of Optimized Normally, modes of Default and Forced are used for debugging and testing For example, you might consider calling the Collect method if some non-recurring event has just occurred that has likely caused a lot of old objects to die .

Figure 5-11

In this practice, you perform a capture of name resolution traffic and compare the result to a similar capture that was performed in Lesson 1 of 4, Configuring DNS Servers and Clients.

The reason that calling Collect in such a circumstance may not be so bad is that the garbage collector s predictions of the future based on the past are not likely to be accurate for non-recurring events For example, it might make sense for your application to force a full garbage collection of all generations after your application initializes or after the user saves a data file When a Windows Form control is hosted on a Web page, a full collection is performed each time a page is unloaded Don t explicitly call Collect to try to improve your application s response time; call it to reduce your process s working set The GC type also offers a WaitForPendingFinalizers method This method simply suspends the calling thread until the thread processing the freachable queue has emptied the queue, calling each object s Finalize method .

Hashtable x_unsafe = new Hashtable(); Console.WriteLine("Sync state: " + x_unsafe.IsSynchronized); Hashtable x_safe = Hashtable.Synchronized(x_unsafe); Console.WriteLine("Sync state: " + x_safe.IsSynchronized);

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In most applications, it s unlikely that you ll ever have to call this method Occasionally, though, I ve seen code like this:.

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The result of these statements is shown below:

GC.Collect(); GC.WaitForPendingFinalizers(); GC.Collect();

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This code forces a garbage collection . When the collection is complete, the memory for objects that don t require finalization is reclaimed . But the objects that do require finalization can t have their memory reclaimed yet . After the first call to Collect returns, the special, dedicated finalization thread is calling Finalize methods asynchronously . The call to WaitForPendingFinalizers puts the application s thread to sleep until all Finalize methods are called . When WaitForPendingFinalizers returns, all of the finalized objects are now

Even though it's possible to generate a thread-safe collection, enumerators are still troublesome. .NET enumerators are backed by the underlying collection, and any changes to the elements can cause problems. .NET takes the approach in common with Java of throwing an exception if the elements are changed during the life of an enumerator.

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