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EXCEPTION WHEN OTHERS THEN ROLLBACK; END; SQL> Autonomous transactions can serve other purposes in the Oracle database. For example, they can enable the handling of nonstandard PL/SQL coding issues, such as using DDL statements in triggers. Autonomous transactions also are useful in performing an audit of database queries and failed (unauthorized) database activity. Listing 8-9 shows an example in which the autonomous transaction feature is used to audit (presumably) unauthorized update activity. Even when a user is unsuccessful in the update attempt, the user s name can be successfully logged into an audit table if you code a simple pair of triggers that use the autonomous transaction feature. Listing 8-9. Using an Autonomous Transaction to Audit Database Activity SQL> CREATE OR REPLACE TRIGGER aud_bef_trig BEFORE INSERT ON emp FOR EACH ROW DECLARE PRAGMA AUTONOMOUS_TRANSACTION BEGIN INSERT INTO audit_employee VALUES ( :new.username, 'before insert', sysdate); COMMIT; END; SQL> CREATE OR REPLACE TRIGGER aud_aft_trig AFTER INSERT ON emp FOR EACH ROW DECLARE PRAGMA AUTONOMOUS TRANSACTION BEGIN INSERT INTO audit_emp VALUES ( :new.username, 'after insert', sysdate); COMMIT; END; SQL> Note that you can t always just use a pair of normal triggers to audit database activity because auditing data provided by the triggers won t be recorded if the triggering statement is rolled back.

Listing 11-8. The VB .NET Implementation of FormMenuToolBar Public Class FormMenuToolBar Inherits System.Windows.Forms.Form Public Sub SelectFolders() toolBarButtonFolders.Pushed = True toolBarButtonSearch.Pushed = False menuItemViewFolders.Checked = True menuItemViewSearch.Checked = False FireViewFolders() End Sub Public Sub SelectSearch() toolBarButtonFolders.Pushed = False toolBarButtonSearch.Pushed = True menuItemViewFolders.Checked = False menuItemViewSearch.Checked = True FireViewSearch() End Sub Public Sub ShowAddress(ByVal theAddress As String) If theAddress Is Nothing Then theAddress = String.Empty textBoxAddress.Text = theAddress textBoxAddress.SelectionStart = textBoxAddress.Text.Length End Sub #Region " Windows Form Designer generated code " Public Sub New() MyBase.New() 'This call is required by the Windows Form Designer. InitializeComponent() 'Add any initialization after the InitializeComponent() call End Sub 'other initialization #End Region #Region "Event Handlers" Private Sub menuItemFileExit_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles menuItemFileExit.Click Application.Exit() End Sub

Imagine you re running a very long batch job and it runs out of space for some reason, whether because of an unexpected amount of data or because of a failure to notice that the space was running out for the objects involved in the DML transactions. Or perhaps there was a maximum number of extents reached error. What are your options when this sort of thing happens (as it inevitably will) Most of the time, you must correct the space problem or other condition that caused the error in the first place, and then restart your transactions. More often than not, you will roll back the whole operation, which will take quite a bit of time. Sometimes you have to restart at the very beginning of the program, which is a waste of time. In any case, your actions as a DBA are limited to playing catchup after the fact to rectify the error and redo the operation. Oracle s Resumable Space Allocation feature will suspend database operations that run into problems due to lack of space, and it restarts those operations automatically when the space problems are fixed. The Resumable Space Allocation

feature comes in handy when you re trying to ensure that key batch jobs or data loads run within the window of operation they are allotted when they encounter space-related issues.

To take full advantage of the Resumable Space Allocation feature, you should use locally managed tablespaces coupled with Automatic Undo Management.

Private Sub menuItemViewFolders_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles menuItemViewFolders.Click SelectFolders() End Sub Private Sub menuItemViewSearch_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles menuItemViewSearch.Click SelectSearch() End Sub Private Sub menuItemViewIcons_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles menuItemViewIcons.Click menuItemViewIcons.Checked = True menuItemViewDetails.Checked = False FireViewIcons() End Sub Private Sub menuItemViewDetails_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles menuItemViewDetails.Click menuItemViewIcons.Checked = False menuItemViewDetails.Checked = True FireViewDetails() End Sub Private Sub menuItemHelpAbout_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles menuItemHelpAbout.Click Dim formAbout As New FormAbout formAbout.ShowDialog() End Sub Private Sub toolBar_ButtonClick(ByVal sender As Object, _ ByVal e As System.Windows.Forms.ToolBarButtonClickEventArgs) _ Handles toolBar.ButtonClick If e.Button Is toolBarButtonUp Then SelectFolders() FireUpSelected() ElseIf e.Button Is toolBarButtonFolders Then SelectFolders() ElseIf e.Button Is toolBarButtonSearch Then SelectSearch() End If End Sub Private Sub buttonGo_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles buttonGo.Click FireAddressChanged(textBoxAddress.Text) End Sub Private Sub textBoxAddress_KeyPress(ByVal sender As Object, _ ByVal e As System.Windows.Forms.KeyPressEventArgs) _ Handles textBoxAddress.KeyPress