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CHAPTER 16 DATABASE RECOVERY
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If you think you didn t go far back enough the first time when you flashed back your database, you can run the FLASHBACK DATABASE command once again, to take the database further back in time. If you have flashed back farther than necessary, you can use the RECOVER DATABASE UNTIL command to take the database forward in time.
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Flashback Database Considerations
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I ll end this section with a few limitations that you must bear in mind when using the Flashback Database feature: You must be running the database in the archivelog mode. If you ve lost a data file, or you can t use a particular data file for whatever reason, then you can t use Flashback Database for recovery. If a control file has been restored or re-created during the time span you want to flash back over, then you can t use the Flashback Database feature. You can t flash back a database to before a RESETLOGS operation. You can t flash back a data file that was shrunk or dropped during the time span covered by the Flashback Table operation.
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In Oracle Database 10g Release 2, you can use Flashback Database to go back past an OPEN RESETLOGS operation. You can thus return the current database to an ancestor or sibling incarnation.
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Using Restore Points
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Oracle Database 10.2 provides a new enhancement to recovery techniques by allowing you to create restore points. A restore point is an alias for an SCN, which eliminates the need to research and record SCNs or timestamps, which you need to use for Flashback Database and Flashback Table operations. Suppose you re executing a new package or procedure that will modify a large amount of data. You can create a restore point beforehand, just in case you have to reverse the effects of this operation. If you need to ever revert back to the original data, all you need to do is refer to the restore point in a Flashback Database or Flashback Table operation. You can also use restore points in a point-in-time recovery operation. You can use a restore point when performing the following types of operations: Flashback Table Flashback Database Database recovery operations
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In order to use restore points, you must be using Oracle Database 10g Release 2, the database should be running in the archivelog mode, and you must use a flash recovery area.
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Here s how you create a restore point: SQL> CREATE RESTORE POINT test; Restore point created. SQL>
CHAPTER 16 DATABASE RECOVERY
You can drop a restore point by using this command: SQL> DROP RESTORE POINT test; Restore point dropped. SQL>
Guaranteed Restore Points
The restore point I created in the previous example is known as an ordinary restore point. An ordinary restore point merely provides you a convenient way of specifying a prior SCN or a point in time during a Flashback or recovery operation. However, an ordinary restore point doesn t guarantee that the database will retain the Flashback Database logs necessary for a Flashback Database operation to succeed under all circumstances. However, you can also create a guaranteed restore point, which guarantees that you can revert your database to the SCN or time specified by the restore point. All you need is enough room in the flash recovery area to store the logs necessary to enforce the guaranteed restore point. Ordinarily, before undertaking a major operation in the database, you might ensure that you have a backup, just in case you have to revert to the original version of the database if something goes wrong. A guaranteed restore point makes performing a backup unnecessary. With a guaranteed restore point, you are always guaranteed that you can flash back your database to that prior time. Guaranteed restore points don t depend on the Flashback logs. Thus, you can create a guaranteed restore point even if Flashback logging is turned off. Guaranteed restore points use a logging mechanism that s somewhat similar to the Flashback logs, but it s separate from them. If you use a guaranteed restore point, Oracle won t delete any Flashback logs that are created after you create the guaranteed restore point. Therefore, you can end up filling up your flash recovery area and causing the database to stop its operations if Flashback logging is enabled when you re using guaranteed restore points. You re better off turning off Flashback logging if you re using guaranteed restore points.
Guaranteed restore points use a separate logging mechanism from the Flashback logging used for a FlashTip back Database operation. You can use guaranteed restore points with or without Flashback logging enabled you must, however, configure a flash recovery area.
You create a guaranteed restore point the same way as an ordinary restore point, just adding the GUARANTEE FLASHBACK CLAUSE to it, as shown here: SQL> CREATE RESTORE POINT test_guarantee GUARANTEE FLASHBACK DATABASE; Restore point created. SQL> You drop a guaranteed restore point in the same way as an ordinary restore point. Once you create a guaranteed restore point, you can use it to recover your database through a Flashback Database operation in the following manner: RMAN> FLASHBACK DATABASE TO RESTORE POINT test_guarantee;
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