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MySQL looks for an entry in the db table matching db.User='jpipes' AND db.Host='localhost' AND db.Database_name='ToyStore'. If a row exists in mysql.db for this combination, the db.Select_priv column is checked. If it found a 'Y' value for the db.Select_priv column, MySQL would accept the request. If a row did not exist in mysql.db matching db.User='jpipes' AND db.Host='localhost' AND db.Database_name='ToyStore' but a row that matched db.User='jpipes' AND db.Host='' AND db.Database_name='ToyStore' did exist, then the mysql.host grant table is queried. If no rows in mysql.host match host.Host='localhost' AND host.Db='ToyStore', MySQL denies the request. If a row in mysql.host does match host.Host='localhost' AND host.Db='ToyStore', then the Select_priv column in both rows in mysql.db and mysql.host are checked for a 'Y' value. If this is the case, MySQL accepts the request. (We ll discuss the relationship between the db and host grant tables in just a moment.) If not, MySQL continues to the tables_priv grant table. If MySQL has reached the tables_priv grant table, it determines if there is a row in the table that matches the condition WHERE User='jpipes' AND Host='localhost' AND Db='ToyStore' AND Table_name='Customer' AND FIND_IN_SET('SELECT', Table_priv)>0.2 If such a row exists, MySQL accepts the request. If not, it repeats a similar process in the columns_priv grant table. If MySQL does not find rows in the columns_priv table for the requested columns of the SELECT statement, MySQL denies the request.

Here s an example that starts an asynchronous task with a callback and sends an additional state parameter. In this example, the state object is simply the delegate that made the call: doSomething.BeginInvoke(originalValue, new AsyncCallback(this.MyCallback), doSomething); And here s how you can retrieve the result in the callback: private void MyCallback(IAsyncResult async) { // Retrieve the delegate. DoSomethingDelegate doSomething = (DoSomethingDelegate)async.AsyncState; // Use it to retrieve the result. int doubleValue = doSomething.EndInvoke(async); // (Do something with the retrieved information.) } It s important to realize that callbacks are actually executed on the same thread as the asynchronous delegate, not the main thread of your application. This fact can cause a host of problems if you don t take it into account. For example, if you try to update an existing object, you could run into synchronization problems (where two threads try to update the same data at once). Similarly, you can t modify the properties of an existing UI control from a separate thread, or you may introduce other obscure errors and trigger unexpected exceptions. The only solution to these problems is to marshal your call to the right user interface thread, or use some type of synchronization. You ll see examples of both these techniques in the following section, as you apply the delegate approach to a more realistic example.

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Total number of pooled active (open) connections Total number of non-pooled 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 awaiting release back into the connection pool

Note You might think that you could solve the thread communication problem by firing an event from your worker thread. Unfortunately, this has the exact same limitation as the callback the event handler will still execute on the same thread, which isn t the main thread of your application.

From a MySQL perspective, you re interested in determining how many threads are executing against the server, what these threads are doing, and how efficiently your server is processing these requests You should already be familiar with many of MySQL s status variables, which provide insight into the various caches and statistics that MySQL keeps available However, aside from this information, you also want to see the statements that threads are actually running against the server as they occur You want to see just how many resources are being consumed by the threads You want to see if one particular type of query is consistently producing a bottleneck for instance, locking tables for an extended period of time, which can create a domino effect of other threads waiting for a locked resource to be freed.

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