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There are other flashback features, like Flashback Drop and Flashback Database, but they don t use undo data. I ll discuss these features in 16, which deals with database recovery.

If you want to make serious use of the new Flashback features, make sure that you provide sufficiently sized undo tablespaces. Preferably, you must use auto-extensible undo tablespaces, so that Oracle retains undo data longer than the longest query duration. In addition, you should specify RETENTION GUARANTEE for the undo data. Simply setting a large UNDO_RETENTION value doesn t guarantee that Oracle won t discard unexpired undo data (as was discussed previously).

public void Build() { // create the navigators for the left pane navigatorFolders = new NavigatorFolders(); navigatorSearch = new NavigatorSearch(); // create the content managers for the right pane contentFolders = new ContentFileList(); contentSearch = new ContentSearchResults(); // UI elements formMenuToolBar = new FormMenuToolBar(); statusBar = new StatusBar(); formMain = new FormMain(); // Coordinators cruise = new CoordinatorCruise(); shutdown = new CoordinatorShutdown(); coordinatorSearch = new CoordinatorSearch(formMain); // move the navigators and content viewers into FormMain formMain.NavigatorFolders = navigatorFolders; formMain.NavigatorSearch = navigatorSearch; formMain.ContentFolders = contentFolders; formMain.ContentSearch = contentSearch; // move the menu, toolbar and statusbar into FormMain formMain.Menu = formMenuToolBar.mainMenu; formMain.Toolbar = formMenuToolBar.panelToolBar; formMain.Statusbar = statusBar; } } Listing 11-4. The VB .NET Implementation of the Builder Public Class Builder ' there can only be one instance of the Builder Private Shared _singleton As Builder Public Shared ReadOnly Property Singleton() As Builder Get If _singleton Is Nothing Then _singleton = New Builder End If Return _singleton End Get End Property Public _binder As Binder Public _userSettings As UserSettings ' UI elements Public _formSplash As FormSplash Public _formMain As FormMain Public _formMenuToolBar As FormMenuToolBar

Using the Flashback Query feature simply involves using the SELECT statement with an AS OF clause. This type of query lets you retrieve committed data as it existed at some time in the past. You can select data from the past based on a time stamp or SCN. It is common for an application to need older data for analysis purposes. A company s sales force, for example, may need older sales data but may find that it has been modified already. Even more important, sometimes a user error or faulty application code may require the restoration of older data. Right now, the most common way to go back in time is for the DBA to perform a laborious and time-consuming point-in-time database recovery, which may involve some disruption in service and a loss of critical business data. The Flashback Query feature provides you an easy way to query data at a point in time.

Here s a simple example that shows how to use Flashback Query. Suppose you find that a user was accidentally deleted from your employees table around noon. The only thing you know for sure is that the employee was in the database at 8 AM. You can use a SELECT statement with the AS OF clause to find the lost data.

First, you must grant the necessary privileges. A user needs to have the privilege to issue a Flashback Query on the table if the user doesn t own the table. Note that you don t need this privilege to execute the DBMS_FLASHBACK package or any of its component procedures. Here s how the DBA can grant the object privileges to enable a user to issue a Flashback Query: SQL> GRANT FLASHBACK ON employees TO salapati Grant succeeded. SQL>