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2.Automatically shut down all webservers in North American offices 3.Send an SMS (Short Messaging Service) message to the database administrator 4.Automatically log the event with the organization s internal IT Audit software 5.Attempt an automatic restart of the database service for a maximum of three tries. Through ODP.NET s HA event notifications, you can write code to make your applications more responsive to database-related disasters.

Listing 6-19 shows the output of mysqldumpslow on the machine we tested our ApacheBench scripts against Listing 6-19 Output from mysqldumpslow #> mysqldumpslow Reading mysql slow query log from /var/log/mysql/slow-querieslog Count: 1148 Time=574s (6585s) \ Lock=000s (1s) Rows=1460 (167608), [test]@localhost SELECT * FROM http_auth WHERE username REGEXP 'S' Count: 1 Time=300s (3s) \ Lock=000s (0s) Rows=900000 (90000), root[root]@localhost select * from http_auth As you can see, mysqldumpslow groups the slow queries into buckets, along with some statistics on each, including an average time to execute, the amount of time the query was waiting for another query to release a lock, and the number of rows found by the query We also did a SELECT * FROM http_auth, which returned 90,000 rows and took three seconds, subsequently getting logged to the slow query log.

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Dealing with mouse clicks is an intricate issue. To determine what should happen, the application needs to determine which shape was clicked. The best approach is to follow these steps: 1. Check if there is a currently selected shape. If there is, test for a hit on the focus square. This has highest precedence. 2. If there s no hit on the focus square, loop through all the shapes and perform a hit test on each one (checking both the surface and the border). This technique is easy thanks to the ShapeCollection.HitTest() method, which respects the proper z-order. 3. If there s no hit on any shape, clear the last selected shape and (depending on the mouse button that was clicked) show a menu. To make this series of steps run smoothly, you need two new details. First of all, you need a form-level variable to track the currently selected shape: private Shape currentShape;

In ODP.NET 11g, you can start up or shut down a database instance using the OracleDatabase class (assuming you have database administrator privileges). For instance, an organization with highly sensitive information might, for security reasons, write an application to automatically shut down a database instance entirely upon detecting suspicious user activity or intrusion attempts.

You also need a helper method to remove the currently selected shape, making sure the Selected property is set to false so the focus square will disappear: private void ClearSelectedShape() { if (currentShape != null) { currentShape.Selected = false; } currentShape = null; } Now you can put together the event handler for the MouseDown event. The first step is to check for a click on a focus square. If that s what happened, turn on resize mode (as in the control-based example). private void Form_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { // Check for a hit on a focus square. Shape.HitSpot hitSpot; if ((currentShape != null) && (currentShape.Selected) && (currentShape.HitTestFocusBorder(new Point(e.X, e.Y), out hitSpot))) { // The border was clicked. Turn on resize mode. clickOffsetX = e.X - currentShape.Location.X; clickOffsetY = e.Y - currentShape.Location.Y; isResizing = true; } ... Otherwise, remove the current selection and perform a new hit test to see what shape (if any) was clicked. ... else { // Remove the last selected shape. ClearSelectedShape(); // Retrieve a reference to the selected shape // using hit testing. currentShape = shapes.HitTest(new Point(e.X, e.Y)); ... If you don t find a shape, and the right mouse button was clicked, show the general form context menu. This allows the user to insert a new shape.

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