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In Listing 6-4, let s say we identified the second row, which indicates a delete operation (D) as the culprit. By mistake, one of our users incorrectly deleted the row. 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 6-5 shows the query you ll need to execute. Listing 6-5. 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 START COMMIT OPERATION USER UNDO_SQL --------------------------------------------------------------------------00020030002D 195243 195244 DELETE HR insert into "HR"."EMP" ("EMPNO","EMPNAME","SALARY") values ('222','Mike','20000'); 1 row selected. SQL> The query in Listing 6-5 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.

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Finally, this chapter discusses how managed classes can use fields of native types and how native types can have data members referring to managed objects..

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 data files 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 10g. 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.

The script then collects all notification output files and sorts them by the age of the passwords. Then all transient files are removed. The final report will list any warnings in order of importance; for example, users without a password will appear first.

Flashback Table uses undo information to restore data rows in changed blocks of tables with DML statements like INSERT, UPDATE, and DELETE. Let s review the steps in a Flashback Table operation.