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Unlike traditional recovery techniques, the primary use of Flashback techniques isn t to recover from a media loss, but to recover from human errors. For example, you may accidentally change the wrong set of data or drop a table. Or you may just want to query historical data and perform change analysis. In some extreme cases, you may want to revert the entire database to a previous point in time.

Payload: (objB)

Note If you have a damaged disk drive, or if there is physical corruption (not logical corruption due to application or user errors) in your database, you must still use the traditional methods of restoring backups and using archived redo logs to perform the recovery.

Traditionally, the only way to recover from human error was to employ traditional backup and restore techniques. The process of restoring the database files and then rolling forward through all the redo logs could often involve significant downtime, however, and Flashback technology offers you a much more efficient and much faster way to recover from logical errors, in most cases while the database is still online and available to users. Furthermore, Flashback techniques allow you to selectively restore certain objects. With traditional techniques, you have no choice but to recover the entire database.

The Flashback Drop feature provides a means to recover an accidentally dropped table (and its indexes) without the loss of any recent transactions. Most experienced DBAs will have experienced situations where a production table has been accidentally dropped. It takes seconds to issue a DROP TABLE statement; the SQL prompt comes back very quickly but its consequences can be dire. Unfortunately, you aren t required to confirm your choice to drop a table before the table is gone! Starting with Oracle Database 10g, when you drop a table, Oracle doesn t get rid of it immediately. It lists the table, and any dependent objects, in the Recycle Bin (more on this shortly) and retains it for as long as possible. If you quickly realize a mistake has been made, you can use the following simple command to immediately restore your lost table: SQL> FLASHBACK TABLE table_name TO BEFORE DROP;

Figure 4-9. Using the payload to affect delivery daisy-chaining Notification forwarding achieves the effect of a multicast, as described in 3. The idea is for the sender to delegate to receivers the task of forwarding the notification to other receivers. The payload contains the list of intended recipients of the notification, in addition to regular arguments. To support notification forwarding, the Sender object must know which destinations the Receiver object is able to forward notifications to. In Figure 4-9, Sender sends a notification with a payload referencing two objects, objA and objB. When Receiver gets the notification, it discovers that the notification should be forwarded to objA. Receiver then removes objA from the payload and forwards the notification to objA, which repeats the process and forwards the notification to objB. Obviously, you can use this technique for any number of forwardees. Intermediate forwarding recipients can choose to handle the notification before or after forwarding it, resulting in the two timing diagrams shown in Figure 4-10. In Figure 4-10, the assumption is that all notifications are delivered with blocking procedure calls. The dotted lines represent return of execution control from the callees. Each forwarding recipient has control over what other objects a notification is sent to. An intermediate recipient might add additional forwardees to the payload or remove some already present. Care must be taken to prevent infinite loops in the delivery path. In the previous example, such a case would occur if objB added itself to the forwarding list.

One of the best ways to avoid accidentally dropping a table is to use the new prompt variables in SQL*Plus, so your database name and username appear as part of the prompt. I explain this in 4.