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The mouse and keyboard events have some subtleties, and it s always best to get a solid and intuitive understanding by watching the events in action. The online code for this chapter provides an ideal example that creates a list of common mouse and keyboard events as they take place. Each entry also includes some event information, giving you an accurate idea of the order in which these events occur and the information they provide. MouseMove events are not included in the list (because they would quickly swamp it with entries), but a separate label control reports on the current position of the mouse (see Figure 2-10).

So, what does all this stuff mean to you anyway How do you go about deciding whether transaction processing requirements should play an active part in your application design Indeed, even if you decide that you should employ some of the transaction processing benefits of MySQL and InnoDB, how do you decide which levels of transaction control, and specifically isolation, you should use Basically, you ll need to consider your comfort level and also user actions to determine your transaction needs A saying in the database administration world is Your paranoia is only as deep as your pockets The usual context of the phrase refers to how much money a business is willing to invest to ensure that it doesn t lose data due to a system failure.

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The Oracle database can publish a set of performance counters for the connection pool to the Windows Performance Monitoring (Perfmon) tool. ODP.NET allows you to enable or disable individual performance counters. Table 2-2 shows some of the various performance counters available. Table 2-2. Performance Counters in Oracle

Figure 2-10. An event tracker For example, here s the code that adds an entry in response to the pic.MouseLeave event: private void pic_MouseLeave(object sender, System.EventArgs e) { Log("Mouse Leave"); } The private Log() method adds the string of information, and scrolls the list control to the bottom to ensure that it is visible. private void Log(String data) { lstLog.Items.Add(data); int itemsPerPage = (int)(lstLog.Height / lstLog.ItemHeight); lstLog.TopIndex = lstLog.Items.Count - itemsPerPage; }

One other useful mouse-related property is Cursor. It sets the type of mouse cursor that is displayed when the mouse is moved over a control, and it applies to all child controls. If your application is about to perform a potentially time-consuming operation, you might want to set the Form.Cursor property to an hourglass. You can access standard system-defined cursors using the static properties of the Cursors class. myForm.Cursor = Cursors.WaitCursor; // (Perform long task.) myForm.Cursor = Cursors.Default;

It costs real money to deploy redundant backup systems to protect the data store, and so a company s level of risk is inversely proportional to the amount of money spent on RAID configurations, redundant power supplies, and so on In a sense, this is a good way to think about your need for transaction processing If you simply cannot tolerate, either personally or from a business perspective, the possibility of your data store becoming inconsistent, you should invest time, and thus money, in implementing transaction-safe capabilities in your application Of course, ensuring that every single execution of business transactions is secured via ACID-compliant, transaction-safe tables and processing takes a level of commitment from the development team Whatever comfort level you and your business users settle on should be the result of honest, thoughtful discourse between the development team and the stakeholders of the application (the actual business).

Total number of new database sessions established each second Total number of database sessions closed each second Total number of cached connections retrieved from the connection pool Total number of cached connections released into the connection pool Total number of active connection pools Total number of inactive connection pools Total number of connections in use Total number of connections available across all connection pools Total number of pooled active (open) connections Total number of nonpooled active (open) connections Total number of connections internally disposed of by the garbage collector Total number of connections that have been closed by the user but are in stasis (that is, awaiting release back into the connection pool)

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