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The DROP TABLE command has been mapped internally onto a RENAME command, which affects the table and all its associated indexes, triggers, and constraints, with the exception of foreign key constraints, which are dropped Foreign key constraints have to be physically dropped If they were maintained, even with a different name, then DML on the nondropped parent table would be constrained by the contents of a dropped table, which would be absurd Grants on tables do not have names, so they can t be renamed When you grant an object privilege, you specify the object by name and the underlying storage of the grant references the object by its object number As the object numbers don t get changed by a RENAME operation, the grants remain valid As far as normal SELECT and DML statements are concerned, a dropped table is definitely dropped There is no change to any other commands, and all your software will assume that a dropped table really is gone But now that DROP is in fact RENAME, it becomes possible to undrop by renaming the table back to its original name However, this is not guaranteed to succeed It may be that the space occupied by the dropped table has been reused There are also complications if in the interim period another table has been created, reusing the same name as the dropped table The dropped objects can be queried, by looking at the recycle bin to obtain their new names This is a listing of all objects that have been dropped, mapping the original table and index names onto the system-generated names of the dropped objects There is a recycle bin for each user, visible in the USER_RECYCLEBIN data dictionary view, or for a global picture you can query DBA_RECYCLEBIN The space occupied by the recycle bin objects will be reused automatically when a tablespace comes under space pressure (after which time the objects cannot be recovered), or you can manually force Oracle to really drop the objects with the PURGE command.

Not satisfied with the list of predefined patterns in the Pattern menu Click the triangle in the upper-right corner of that pop-up menu and choose New Pattern to design your own, or load additional sets of patterns from the list at the bottom of the menu (See the tip entitled Create Custom Patterns in 8 for details on how to create your own)

TIP There are no guarantees of success with Flashback Drop, but it may well work The sooner you execute it, the greater the likelihood of success

Consider the example in Figure 19-3 This is the most basic use of Flashback Drop The DROP command renames the table to a system-generated name, and Flashback Drop brings it back Variations in syntax are

SQL> drop table <table_name> purge; SQL> flashback table <table_name> to before drop rename to <new_name> ;

Figure 7-10

The first command really will drop the table The PURGE keyword instructs Oracle to revert to the original meaning of DROP: all references to the table are deleted, and it can never be brought back The second command will flash back the table but give it a new name This would be essential if, between the drop and the flashback, another table had been created with the same name as the dropped table Note that although

a table can be renamed during a flashback, it cannot change schemas: all flashback operations occur within the schema to which the object belongs The indexes, triggers, and constraints that are flashed back along with the table keep their recycle bin names If you want to return them to their original names, you must rename them manually after the flashback There are two points to emphasize here First, Flashback Drop can only recover from a DROP It cannot recover from a TRUNCATE Second, if you drop a user with, for example,

SQL> drop user scott cascade;

To easily fill the word crazy with a multicolored pattern, I used the Pattern Overlay layer style

you will not be able to recover any of SCOTT s tables with flashback The drop of the schema means that Oracle cannot maintain the objects at all, even in the recycle bin, because there is no user to whom to connect them Database Control also has an interface to Flashback Drop From the database home page, take the Availability tab and then Perform Recovery in the Manage section In the drop-down box for Recovery Scope, select TABLES, and then the radio button for Flashback Dropped Tables This will take you to the Perform Object Level Recovery: Dropped Objects Selection window (shown in Figure 19-4), where you can

Figure 19-4