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I shifted the position of some of the operators and added arrows to denote the original ow. Also, I included the full object names where relevant. In the original plan, object names are truncated if they are long. A plan is a tree of operators. Data ows from a child operator to a parent operator. The tree order of graphical plans that you get in SSMS is expressed from right to left and from top to bottom. That s typically the order in which you should analyze a plan to gure out the ow of activity. In our case, the Clustered Index Seek operator is the rst operator that starts the ow, yielding its output to the next operator in the tree Table Spool (Eager Spool) and so on. Notice the cost percentage associated with each operator. This value is the percentage of the operator s cost out of the total cost of the query, as estimated by the optimizer. You want to keep an eye especially on operators that involve high-percentage values and focus your tuning efforts on those operators. When you place your mouse pointer over an operator, you will get a yellow information box. One of the measures you will nd there is called Estimated Subtree Cost. This value represents the cumulative estimated cost of the subtree, starting with the current operator (all operators in all branches leading to the current operator). The subtree cost associated with the root operator (topmost, leftmost) represents the estimated cost of the whole query, as shown in Figure 4-10.

Dynamic Code Execution 275 Bindings 276 Other Forms of eval 277 Creating Your Own Version of attr_accessor 279 Running Other Programs from Ruby 280 Getting Results from Other Programs 280 Transferring Execution to Another Program 281 Running Two Programs at the Same Time 281 Interacting with Another Program 282 Safely Handling Data and Dangerous Methods 283 Tainted Data and Objects 283 Safe Levels 286 Working with Microsoft Windows 286 Using the Windows API 287 Controlling Windows Programs 289 Threads 290 Basic Ruby Threads in Action 291 Advanced Thread Operations 292.

private void PrepareSortedDataView(int colPos) { // Set the column to sort by m_viewOfData.Sort = m_data.Columns[colPos].ColumnName; // Arrange the auto-reverse sorting if (m_columnSorted == colPos) { // If the same column is clicked twice, // invert the direction m_viewOfData.Sort += "DESC"; m_columnSorted = -1; } else // Store the index of the currently sorted column m_columnSorted = colPos; } Implementing row filtering is even easier. You simply expose a read/write property called, say, RowFilter and make it work as a wrapper around the DataView object's RowFilter property, as shown here: private string m_rowFilter = ""; public string RowFilter { get {return m_rowFilter;} set { // Store the filter string m_rowFilter = value; // Pass the information on to the DataView m_viewOfData.RowFilter = m_rowFilter; // Refresh the view FillTable(); } } What we have built so far is a ListView -based control that features data-binding functionalities along with advanced capabilities for sorting and filtering the data. This control can be initialized from an XML string that can be deserialized to a DataSet object. The DataListView control can be used with any Windows Forms application, but when embedded in an HTML or ASP.NET page, the programming interface lends itself very well to filling the control with the contents of an XML data island. 496

Correct Answers: C A. Incorrect: Both Active Directory integrated zones and standard primary DNS zones on Microsoft Windows Server 2003 computers can be configured to update their records dynamically. B. Incorrect: A DHCP server on an Active Directory domain must be authorized in Active Directory before it can issue leases. In this scenario, the DHCP server has issued leases and must therefore be authorized. C. Correct: By default, the computer that updates a DNS record owns that record, and no other computer can update it. Because the DHCP server has been updating host A resource records, it owns these records. This problem was not apparent when the DHCP server was updating both A and PTR resource records, but now it has been reconfigured to allow clients to update their own host resource records. The clients cannot perform this task because the DHCP server owns the records. The DNSUpdateProxy group was created to solve this problem. Members of this group can update resource records but do not own them. The DHCP server would have become a member of this group automatically when it was config ured to issue host resource records, but for some reason, it has been removed. You can reconfigure the DHCP server to update both host and PTR resource records, but a better solution is to add the server to the DNSUpdateProxy group,