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The idea here is that you don t want to introduce coupling into parts that are inherently complex, unless you have no other choice. Together, you should consider these two axioms the guiding principles of system design. You should do a significant amount of work in the design phase to control where and how much coupling occurs between the various classes and components you create. Even more effort is needed during implementation and maintenance to ensure that the originally planned coupling doesn t grow unnecessarily.

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.

First, you need to make sure the user performing the Flashback Table operation has all privileges, which could be either FLASHBACK ANY TABLE or the more specific FLASHBACK object privilege on the table to be flashed back. The user must also have SELECT, INSERT, DELETE, and ALTER privileges on the table. The flashback operation doesn t preserve Oracle ROWIDs when it restores rows in the changed data blocks of the table, since it uses DML operations to perform its work. These DML operations change the ROWIDs of the affected rows, so you must ensure that you have enabled row movement in the tables you are using for the Flashback Table feature, as shown here: SQL> ALTER TABLE emp ENABLE ROW MOVEMENT; Table altered. SQL>

Once you enable row movement in the table, you are ready to flash back the table to any time or any SCN in the past, providing you have the necessary undo information in your undo tablespace. Before you use the Flashback Table feature, note its complete syntax: SQL> FLASHBACK TABLE [schema.]table [,[schema.]table] . . . TO {{SCN|TIMESTAMP} expr [{ENABLE|DISABLE}TRIGGERS ] |BEFORE DROP[RENAME TO table] }; In this chapter, you ll only see the FLASHBACK TABLE . . . TO SCN|TIMESTAMP part of the FLASHBACK TABLE statement. In the last line, BEFORE DROP refers to the FLASHBACK DROP feature, which is covered in 16 in the discussion of database recovery techniques. Here s an example that shows how to flash back a table to a past SCN: SQL> FLASHBACK TABLE emp TO SCN 5759290864; Flashback complete. SQL>

This chapter shows that there are ways to design components to minimize or even eliminate coupling to other components. If you systematically attack the coupling problem when designing each component in a system, you can usually find ways to shift coupling from complex components to simpler ones. But at some point, you reach a point at which no more simplifications are possible, leaving a residual amount of coupling in the system. In the ideal situation, the most complex components are

When a Flashback Table operation completes, all indexes that belong to the tables in the Flashback Table list will have their indexes reverted to the time to which the tables are flashed back. However, the optimizer statistics will still reflect the current data in the table.

You can also specify a time to flash back to, using a time stamp instead of an SCN, as shown here: SQL> FLASHBACK TABLE persons TO TIMESTAMP TO_TIMESTAMP ('2008-01-30 07:00:00', 'YYYY-MM-DD HH24:MI:SS'); The preceding FLASHBACK TABLE command restores the persons table to 10:00 AM on April 5, 2005. You can use the following statement to flash back a table by one day: SQL> FLASHBACK TABLE persons to TIMESTAMP (SYDATE -1); You can flash back more than one table at a time, as shown in the following example (but first make sure you enable row movement for both tables): SQL> FLASHBACK TABLE persons,person_orgs TO TIMESTAMP (SYSDATE -1) The Flashback Table operation is an in-place, online operation and thus doesn t involve taking datafiles or tablespaces offline, unlike traditional point-in-time recovery. Oracle disables all relevant triggers by default and reenables them upon completing the table recovery, though you can override this by appending the ENABLE TRIGGERS clause to your FLASHBACK TABLE statement, as shown here: SQL> FLASHBACK TABLE persons to TIMESTAMP TO_TIMESTAMP ('2009-04-05 10:00:00', 'YYYY-MM-DD HH24:MI:SS') ENABLE TRIGGERS; If you don t have sufficient undo data to flash back the table, you ll get the error shown in Listing 8-6, which means that part of the undo information was overwritten. Unfortunately, the Flashback Table feature can t help you here, as it relies entirely on the presence of adequate undo information. The only solution is to use a larger undo tablespace or enable the guaranteed undo retention feature as explained in the The UNDO_RETENTION Parameter section, earlier in this chapter.