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#region Events public delegate void UniversalHandler(); public event UniversalHandler OnViewFolders; void FireViewFolders() { if (OnViewFolders != null) OnViewFolders(); } public event UniversalHandler OnViewSearch; void FireViewSearch() { if (OnViewSearch != null) OnViewSearch(); } public event UniversalHandler OnViewIcons; void FireViewIcons() { if (OnViewIcons != null) OnViewIcons(); } public event UniversalHandler OnViewDetails; void FireViewDetails() { if (OnViewDetails != null) OnViewDetails(); } public event UniversalHandler OnUpSelected; void FireUpSelected() { if (OnUpSelected != null) OnUpSelected(); } public delegate void AddressChangedHandler(string theNewAddress); public event AddressChangedHandler OnAddressChanged; void FireAddressChanged(string theNewAddress) { if (OnAddressChanged != null) OnAddressChanged(theNewAddress); } #endregion }

All you need to do in order to extract the correct SQL to undo this delete operation is to take the transaction ID (XID) from this Flashback Versions Query and search for it in the FLASHBACK_TRANSACTION_QUERY view Listing 8-5 shows the query you ll need to execute Listing 8-5 Selecting Undo SQL Based on a Transaction ID SQL> SELECT xid, start_scn START, commit_scn COMMIT, operation OPERATION, logon_user USER, undo_sql FROM flashback_transaction_query WHERE xid = HEXTORAW('0004002D0002B366'); XID --------00020030D START -----195243 COMMIT -----195244 OPERATION --------DELETE USER ---HR UNDO_SQL -----------------------------insert into "HR""EMP" ("EMPNO","EMPNAME","SALARY") END_SCN -------OPERATION ---------I D I EMPNAME --------Nick Sam Sam SALARY -------19000 20000 20000.

values ('222','Mike','20000'); 1 row selected. SQL> The query in Listing 8-5 gives you the exact undo SQL statement to undo the deletion operation performed by the transaction with XID 0020030002D. As you can see, the Flashback Versions Query and the Flashback Transaction Query provide complementary features. You can use the two together not only to undo logical data errors, but also to audit transactions in your database. By using the two features, you can tell exactly how a certain row came to have a certain set of values and then get the exact SQL statements you need to undo the changes if necessary.

A quick note here about the meaning of the word component. In this book, a component is a self-documenting binary entity containing classes and/or objects. If you re a .NET developer, a component is basically a .NET assembly. Axiom 1 might appear to be paradoxical, because the more complex a part is, the more coupled it tends to be with other parts. The point is that coupling introduces complexity, so if a part is complex to start with, due to its internal business logic, then you want to avoid increasing this complexity further with coupling. The following is an immediate consequence of the first axiom:

Oracle s Flashback Table feature lets you recover a table to a previous point in time. This feature relies on undo information in the database undo segments to perform the point-in-time recovery without restoring any datafiles or applying any archived redo log files, as needed to be done for traditional point-in-time recovery. You can use the Flashback Table feature to roll back changes to a previous point in time defined by either a time stamp or an SCN. Since you rely on undo data to flash back a table (rather than restoring your backup files), you don t have to take your database or tablespaces offline during a Flashback Table operation. Oracle acquires exclusive DML locks on the table or tables that it is recovering, but the tables continue to remain online.

Note There are two distinct table-related Flashback features in Oracle Database 11g. The first, Flashback Table,

lets you flash back a table to a past point in time. This feature depends entirely on the availability of the necessary undo data, and is discussed in this chapter. The second feature, Flashback Drop (FLASHBACK TABLE table_name TO BEFORE DROP), lets you retrieve a table that has been dropped altogether. This feature is helpful in performing a point-in-time recovery and relies on the Recycle Bin, not undo data. I ll discuss the Flashback Drop feature in 16, which deals with database recovery.