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startup cost (to build a hash table for one side of a join). Nested loops joins have no startup cost but a somewhat higher per-row cost. So, when a client wants only a few rows but does not specify a query that returns only a few rows, the latency of the rst row may be slower due to the startup costs for stop-and-go operators like hash joins, spools, and sorts. The FAST <number_rows> hint supplies the costing infrastructure with a hint from the user about how many rows the user will want to read from a query. Internally, this is called a row goal, and simply provides an input into the costing formulas to help specify what point on the costing function is appropriate for the user s query. The TOP() syntax in SQL Server introduces a row goal as well. Note that if you supply TOP(@param), then the Query Optimizer may not have a good value to sniff from the T-SQL context. In this scenario, you would want to use the OPTIMIZE FOR hint (described later in this section).

If the assembly doesn t contain the specified type, the GetType method returns Noth ing. You can have this method throw a TypeLoadException if the specified type isn t found by passing True as its second argument, and you can have the type name com pared in a case-insensitive way by passing True as a third argument:

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Limit the number of CAs enabled for key archival. Do not archive keys for users at many CAs in the CA hierarchy, as recovery operations become confusing. Enable the CA to audit the storage and retrieval of archived keys. This ensures that all retrieval of archived private keys is captured in the Windows Security Log. Never leave the Key Recovery Agent certificate and private key in a user s profile. Once you complete any key recovery operation, log off the network and delete the profile directory of the user account used to perform the key recovery operation. This prevents leaving additional copies of the Key Recovery Agent certificate and private key on the network. Protect the Key Recovery Agent certificate and private key by using a smart card or other two-factor device. A smart card protects the Key Recovery Agent certificate s private key with two-factor authentication. The key recovery agent must have access to the smart card and must know the PIN of the smart card. A smart card also prevents the Key Recovery Agent certificate s private key from ever being stored on the local file system of the computer.

8

Part III:

Creating the Deck Class The methods of the Deck class correspond closely to the real-world uses of a deck of cards: shuffle, deal, and draw. Create the class 1. On the Project menu, click Add Class. The Add New Item dialog box appears. 2. Name the file Deck.vb or Deck.cs, depending on the language you re using. Create the fields and properties 1. Add the following code for the Count property. The Count property returns the number of cards in the deck. The cards are stored in an instance of the ArrayList class. This class accepts objects of any type and allows access to members by an index value. New members can be added to the ArrayList class without your having to resize the list. The value of the Count property is determined by the number of cards in the deck. Therefore, Count is a read-only property. 2. Visual Basic 3. Private m_cards As New System.Collections.ArrayList() 4. Public ReadOnly Property Count() As Integer 5. Get 6. Return m_cards.Count 7. End Get 8. End Property 9. 10. // Visual C# 11. private System.Collections.ArrayList m_cards = 12. new System.Collections.ArrayList(); 13. public int Count { 14. get { return m_cards.Count; } 15. } 16. Add the following default property or indexer to return a specific card from the ArrayList, based on an index: 17. Visual Basic 18. Default Public ReadOnly Property Cards(ByVal indexer As Intege r) As Card 19. 20. 21. 22. 23. 24. 25. 27. 28. // Visual C# 29. public Card this[int indexer] { 30. 31. 32. get { if ((indexer >= 0) && (indexer < m_cards.Count)) { return((Card)m_cards[indexer]); Get If ((indexer >= 0) And (indexer < m_cards.Count)) Then Return CType(m_cards(indexer), Card) Else Throw New ArgumentOutOfRangeException("Index out of range.") End If End Get

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qu.Enqueue(30)

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