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or contacts if a network outage or a major service outage occurs This means a contact could be flooded with emails, pages, or SMS This can reduce the value of notifications To deal with this potential problem, you can choose from a number of possible solutions, including aggregating notifications, throttling the volume of notifications sent, or suppressing notifications You can do this by developing your own scripts and tools or by using an already developed tool for the purpose I ve included a Perl script, called throttling_notificationspl, with the electronic resource for this book that will perform throttling of email notifications8 The throttling_notificationspl script acts as a layer between your notification command and the notification mechanism in this case, any mechanism that takes an email address as its input.

If you want to create views as aliases for security or abstraction, consider creating a separate dataTip base where your views are defined. Doing this means that the client uses a completely different database to view data, and you can use the same names as your tables for your views, because they aren t in the same namespace as the database where your tables are stored.

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Dim aRE As AutoResetEvent aRE = New AutoResetEvent(True) Console.WriteLine("Before first WaitOne ") Dim state As Boolean = aRE.WaitOne(1000, True) Console.WriteLine( _ "After first WaitOne {0} , state) state = aRE.WaitOne(1000, True) Console.WriteLine( _ "After second WaitOne {0} , state) End Sub End Class End Namespace The output from AutoReset is the same as that from the ManualReset example shown earlier: Before first WaitOne After first WaitOne True After second WaitOne False In AutoReset, the differences between the AutoResetEvent and ManualResetEvent are clear. The state of the event object changes from the signaled to nonsignaled at the first WaitOne() and then it again changes state from nonsignaled to signaled at the second WaitOne() method. As a result, the thread does not wait at the first WaitOne() method and has to wait at the second WaitOne() method until the time expires.

With regard to already developed tools, at the time of this writing only two tools are currently maintained and compatible with Nagios 20 for managing notifications like this The first is called NAN, or the Nagios Notification Daemon, and it is available from http://oscyberheatinccom/ nanphp The NAN daemon works by acting as a filtering layer between Nagios and the notification mechanisms It controls two functions: when to send notifications and how often NAN can limit the number of notifications sent, concatenate a series of notifications together, and control how often notifications are sent NAN does this by inserting itself between Nagios and the notification mechanism Instead of the notification command calling the notification mechanisms, Nagios calls the NAN daemon and passes the notification to the daemon The NAN daemon processes the notification according to predefined rules, and performs the notification by calling the required notification mechanism.

Setting optional column names in a view allows you to change how the results are labeled when returned to the client. The number of columns specified in the column list must match the number of columns returned from the SELECT statement that defines the view. Listing 12-4 demonstrates creating the customer_region1 view, using the optional column names to specify the column labels returned with the query results. Listing 12-4. Creating a View with Specified Column Names mysql> CREATE VIEW customer_region1 (id, firstname) AS SELECT customer_id, name FROM customer WHERE region = 1; The results returned from the customer_region1 view will now label the columns as specified in the CREATE statement, as demonstrated in Listing 12-5. Listing 12-5. Selecting from the View with Specified Column Names mysql> SELECT * FROM customer_region1; +----+-----------+ | id | firstname | +----+-----------+ | 1 | Mike | | 2 | Jay | +----+-----------+

Like the ManualResetEvent and the AutoResetEvent classes, the Mutex class is also derived from the WaitHandle class. It is very similar to the Monitor class with the exception that it can be used for interprocess synchronization. Consider an example, NetMutex.vb: Imports System Imports System.Threading Namespace NetThreading Class NetMutex Private Shared resourceMutex As Mutex <STAThread()> Public Shared Sub Main() resourceMutex = New Mutex(True, "NetThread") Dim nm As New NetMutex For i As Integer = 1 To 5 Dim t As New Thread( _ New ThreadStart(AddressOf nm.Run)) t.Name = String.Format("Thread_{0}", i) t.Start() Next resourceMutex.ReleaseMutex() Console.ReadLine() End Sub

The NAN daemon consists of two components: the server and a client application The client application receives the notifications, and the server processes them and sends them on using the notification mechanisms..

AS keyword for renaming columns with the SQL statement that defines the view. While this works, we recommend avoiding it and using the method demonstrated in Listing 12-4. Using AS in your defining SELECT statement complicates combining SQL statements when using the MERGE algorithm. In addition, the SQL:2003 standard specifies using the column list when changing the names of your columns.

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