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Shared Sub Main() Dim _formMain As FormMain = Nothing Try _formMain = New FormMain Catch ex As Exception ' exceptions typically occur if the client can't connect to the server MessageBox.Show(ex.Message, "An exception occurred") Return End Try Application.Run(_formMain) End Sub End Class

You can run other important commands besides the status command after invoking the lsnrctl utility. For example, the services command will let you see what services the listener is monitoring for connection requests.

You can also check the status of the listener service from the Net Services Administration page in Oracle Enterprise Manager.

You can see the various lsnrctl commands available by using the help command in the lsnrctl interface, as shown in Listing 11-3.

Public Class WorkerOrderEntry Inherits System.Windows.Forms.UserControl Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() End Sub ' Private Sub ComboBoxModel_SelectedIndexChanged(_ ByVal sender As Object, e As System.EventArgs) Handles ComboBoxModel.SelectedIndexChanged ComboBoxStyle.Items.Clear() Dim model As String = ComboBoxModel.Text Dim styles As String() = FireGetStyles(model) If styles Is Nothing Then Return If styles.Length = 0 Then Return ComboBoxStyle.Items.AddRange(styles) ComboBoxStyle.SelectedIndex = 0 End Sub

Listing 11-3. Using lsnrctl Help to List the lsnrctl Commands $ lsnrctl help LSNRCTL for 32-bit Windows: Version 11.1.0.6.0 - Production on 20-MAR-2008 Copyright (c) 1991, 2007, Oracle. All rights reserved. The following operations are available An asterisk (*) denotes a modifier or extended command: start services save_config quit show*$ stop version trace exit status reload change_password set*

You can start the listener by using the start command, and you can stop the listener by using the stop command after invoking the lsnrctl utility. If you want to issue these commands from the operating system command line, you can use the commands lsnrctl start and lsnrctl stop to perform the two tasks. If you make changes to the listener.ora file, one way to put the changes into effect is to restart your listener. The other and safer method is to merely reload the listener information, which includes the newly made changes to the listener configuration file. The lsnrctl reload command lets you reload the listener on the fly, without your having to bounce it. Currently connected clients will continue to be connected while the listener is being reloaded (or even bounced) because the listener has already handed off the connections to the database and isn t involved between the client and the database service.

Caution I advise not modifying the listener.ora file unless you absolutely have to, and with dynamic automatic service registration, there is less need for you to modify the file. Nevertheless, there may be times when you have to change some part of the listener file, which consists of network configuration information for all the services the listener is monitoring for connection requests.

Private Sub ComboBoxStyle_SelectedIndexChanged( _ ByVal sender As Object, ByVal e As System.EventArgs) _ Handles ComboBoxStyle.SelectedIndexChanged TreeViewOptions.Nodes.Clear() Dim model As String = ComboBoxModel.Text Dim style As String = ComboBoxStyle.Text Dim options As ArrayList = FireGetOptions(model, style) If Not options Is Nothing Then PopulateOptions(options) End If

Although it s quite easy to set up the listener service, you can do several things afterward to tune up your connection process and to make the listener service secure. I ll cover some of these options in the following sections.

You can have more than one listener service running on the same server, but you ll usually do this when you re using Oracle Real Application Clusters (RAC). If you do use multiple listener services, you can configure the CONNECT_TIME_FAILOVER parameter, which determines how long a client connection waits for a connection through one listener before attempting a connection through another.