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WITH StartingPoints AS ( SELECT seqval, ROW_NUMBER() OVER(ORDER BY seqval) AS rownum FROM dbo.TempSeq AS A WHERE NOT EXISTS (SELECT * FROM dbo.TempSeq AS B WHERE B.seqval = DATEADD(hour, -4, A.seqval)) ), EndingPoints AS ( SELECT seqval, ROW_NUMBER() OVER(ORDER BY seqval) AS rownum FROM dbo.TempSeq AS A WHERE NOT EXISTS (SELECT * FROM dbo.TempSeq AS B WHERE B.seqval = DATEADD(hour, 4, A.seqval)) ) SELECT S.seqval AS start_range, E.seqval AS end_range FROM StartingPoints AS S JOIN EndingPoints AS E ON E.rownum = S.rownum;

All these collection classes are non-blocking That is, if a thread tries to extract an element when no such element exists, the thread returns immediately; the thread does not block waiting for an element to appear This is why methods like TryDequeue, TryPop, TryTake, and TryGetValue all return true if an item was obtained and false if not These non-blocking collections are not necessarily lock-free The ConcurrentDictionary class uses Monitor internally, but the lock is held for a very short time while manipulating the item in the collection ConcurrentQueue and ConcurrentStack are lock-free; these both internally use Interlocked methods to manipulate the collection A single ConcurrentBag object internally consists of a mini-collection object per thread When a thread adds an item to the bag, Interlocked methods are used to add the item to the calling thread s minicollection .

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As previously described, you can configure a Windows Server 2003 DHCP server so that it dynamically registers both A and PTR resource records on behalf of DHCP cli ents In this configuration, the use of secure dynamic updates with Windows Server 2003 DNS servers can occasionally lead to stale resource records Because secure dynamic updates require that the owner of a resource record update that record, resource records are not updated if your configuration ever changes For example, suppose the following sequence of events occurs: 1 A Windows Server 2003 DHCP server (DHCP1) performs a secure dynamic update on behalf of one of its clients for a specific DNS domain name 2 Because DHCP1 successfully created the name, DHCP1 becomes the owner of the name 3 Once DHCP1 becomes the owner of the client name and associated resource records, only DHCP1 can update the name or its IP address.

Just as a control s appearance is defined by a control template, you can create a data template to define the appearance of a particular data type. Look at the user interface in Figure 20-16 it shows a pair of listboxes, in a typical master/details scenario. The ListBox on the left looks fairly ordinary it lists product categories, showing each one as simple text. You might think this works by fetching the list of categories and then iterating over them with a loop that creates a ListBoxItem for each one. In fact, it s much simpler than that. Example 20-28 shows the Xaml for the ListBox on the left.

In some circumstances, this situation might cause problems For instance, suppose DHCP1 later fails If a second backup DHCP server (DHCP2) comes online, DHCP2 is unable to update the client s resource record because DHCP2 is not the owner of the record In a similar example, suppose DHCP1 has registered the name hostexam plemicrosoftcom on behalf of a client running a version of Windows earlier than Win dows 2000 Then the administrator upgrades that client computer to Windows XP Professional Because the DHCP server (DHCP1) is the owner of this name, the client cannot update its DNS records once the computer is upgraded To solve these kinds of problems, Windows Server 2003 Active Directory provides a built-in security group called DnsUpdateProxy Any object created by the members of this group has no security settings.

As a result, initially, the object has no owner, and it can therefore be updated by a DHCP server or client that did not create it, even in zones requiring secure updates However, as soon as the first DHCP server or client that is not a member of the DnsUpdateProxy group modifies such a record, that server or client then becomes its owner After that point, only the owner can update the record in zones requiring secure updates Thus, if every DHCP server registering resource records for older clients is a member of this group, and the clients themselves are not members of the group, the problems discussed earlier are eliminated..

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