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completely decoupled. Only the simplest components are coupled to other components. No amount of refactoring can ever eliminate all the intercomponent coupling, unless you put the entire system into a single component, which takes you back to a stovepipe system. The following theorem describes the inevitability of intercomponent coupling in a multicomponent system:

Listing 8-6. Failure of a Flashback Table Operation SQL> FLASHBACK TABLE emp,dept to TIMESTAMP (SYSDATE -1); flashback table emp, dept to TIMESTAMP (SYSDATE -1) * ERROR at line 1: ORA-00604: error occurred at recursive SQL level 1 ORA-12801: error signaled in parallel query server P005 ORA-01555: snapshot too old: rollback segment number 108 with name "_SYSSMU108$" too small 01555, 00000, "snapshot too old: rollback segment number %s with name \"%s\" too small" // *Cause: rollback records needed by a reader for consistent read are // overwritten by other writers // *Action: If in Automatic Undo Management mode, increase undo_retention // setting.

If it turns out that your Flashback Table results aren t to your liking, you can use the FLASHBACK TABLE statement again to go back to just before you first issued the FLASHBACK TABLE statement. It s important to always note your current SCN before running a Flashback Table operation so that you can undo it with the FLASHBACK TABLE . . . TO SCN statement if necessary. You can find out the current SCN in your database by using the following query: SQL> SELECT current_scn from V$DATABASE; CURRENT_SCN --------------------5581746576 SQL>

Several restrictions apply to the Flashback Table feature. Here are the important ones: You can t flash back a table owned by SYS, recovered objects, or a remote table. You can t flash back a table to a time preceding any DDL operation involving a change in table structure, such as modifying or dropping a column, truncating a table, adding a constraint, or performing any partition-related operations, such as adding or dropping a partition. The FLASHBACK statement involves a single transaction, and the Flashback operation succeeds entirely or it fails. If the flashback operation involves multiple tables, all of the tables must be flashed back or none. If Oracle discovers any constraint violations during the Flashback operation, it abandons the operation, leaving the tables in their original state. If you shrink a table or change any nonstorage attributes of a table (other than attributes such as PCTFREE, INITTRANS, and MAXTRANS), you won t be able to flash back to a time before these changes were made.

Informal proof: To function, you must instantiate the classes in each component somehow. In most object-oriented (OO) languages, instantiation entails invoking a class constructor. For example, in languages like C#, Java, and C++, you must use the new operator like this: T2 t2 = new T2(); The class in which this instantiation code is located incurs coupling to the class being instantiated. If component C1 contains class T1, which has code to instantiate T2 contained in component C2, then C1 will be coupled to C2, as shown in Figure 1-1.

You can use the Flashback Transaction feature to back out an unwanted transaction. You can back out not only the unwanted transaction, but also its dependent transactions as well, with a single click. So, if you re using the Database Control to do this instead of a PL/SQL procedure, the Flashback Transaction feature offers a far superior alternative to restoring backups to undo transactions, since the database remains online to users while you re backing out the unwanted transactions. Undo data is the key to the Flashback Transaction feature. The database uses the undo data to create and execute the necessary compensation transactions that ll undo the unwanted transaction. The TRANSACTION_BACKOUT procedure analyzes all transactional dependencies and performs the necessary DML operations to undo the changes made in a transaction. Execution of the procedure also generates reports of the changes it made. However, the critical thing to know is that the procedure doesn t automatically commit the DML operations that it performs, but waits for you to explicitly commit the transaction and make the backout operation permanent.