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Figure 12-1. ODP.NET performance counters in the Reliability and Performance Monitor tool Click the OK button to confirm. You will see the ODP.NET counters show up in the time graph area. Table 12-1 shows the list of performance counters available in Oracle and what each counter represents. Table 12-1. List of Performance Counters in Oracle

Row exists in host table for: host.Db='ToyStore' AND host.Host='localhost'

When you call EndInvoke(), the call becomes synchronous That means that if the underlying method hasn t returned by the time you call EndInvoke(), your code simply waits for it to finish, as it would if you called Invoke() If you want to check whether the method is actually complete before you call EndInvoke(), you can check the IsCompleted property of the IAsyncResult object that s returned from the BeginInvoke() method You can check this information repeatedly (for example, in a loop while you do some other work in bite-sized pieces) This approach is known as polling, and it s usually not terribly efficient Here s an example that uses it: IAsyncResult async = doSomethingBeginInvoke(12, null, null); // Loop until the method is complete while (!asyncIsCompleted) { // Do a small piece of work here } int doubleValue = doSomething.

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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

Yes Row exists in tables_priv table for: tables_priv.User='jpipes' AND tables_priv.Host='localhost' AND tables_priv.Db='ToyStore' AND FIND_IN_SET('SELECT', tables_priv.table_priv)>0 db.Select_priv = 'Y' AND host.Select_priv = 'Y'

EndInvoke(async); A better approach is to use a callback to react immediately when an asynchronous task is complete Callbacks allow you to separate the code for different tasks, and they can simplify your application significantly To use a callback, you must first create a method that accepts a single parameter of type IAsyncResult, as shown here: private void MyCallback(IAsyncResult async) { .. } The IAsyncResult object is the same object you receive when you call BeginInvoke() It s provided to your callback so that you can easily complete the call just call EndInvoke() and submit the IAsyncResult object To use a callback, you need to pass a delegate that points to your callback method as the second-to-last parameter when you call BeginInvoke(): doSomethingBeginInvoke(12, new AsyncCallback(this.

MyCallback), null); In this case, the BeginInvoke() will still return the same IAsyncResult object, but the code doesn t need to use it to monitor progress because the CLR will automatically call the callback method as soon as the asynchronous operation is complete Callbacks don t provide any information about why they were triggered They don t even provide the delegate object that you used to start the asynchronous processing That means that if you re handling several asynchronous tasks with the same callback, you can t easily tell which operation has completed when the callback fires To get around this limitation, you can send an additional object using the last parameter of the BeginInvoke() method This object is then provided through the IAsyncResultAsyncState parameter in the callback method You can use any object, including an instance of a custom class that records the details of the original operation.

Two rows exists in columns_priv table for: columns_priv.User='jpipes' AND columns_priv.Host='localhost' AND columns_priv.Db='ToyStore' AND columns_priv.Table_name='Customer' AND columns_priv.Column_name IN ('login','password') AND FIND_IN_SET('SELECT', columns_priv.column_priv)>0 Yes MySQL accepts request No MySQL denies request

NumberOfActiveConnectionPools NumberOfInactiveConnectionPools NumberOfActiveConnections NumberOfFreeConnections

One useful trick is to provide the original delegate object (in this case, the doSomething delegate) as part of that custom class This way, you can easily complete the call in the callback by calling EndInvoke() on the provided delegate Otherwise, it s up to you to keep the delegate reference around for later..

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