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The most serious recovery issues are those related to media problems. Damage to disks that prevent them from being read from or written to is the most serious scenario, and you ll have to depend on your backup copies of the database and log files to make the database current without any permanent
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CHAPTER 16 DATABASE RECOVERY
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loss of data. If your datafiles or control files are on the inaccessible media, you ll most likely end up doing a recovery. In some situations, you may perform a recovery even if there s no media damage for instance, when there s a serious case of user error. If you have to restore a backed-up datafile or you take a file offline using the OFFLINE IMMEDIATE option, you ll need to perform a media recovery. Two factors are critical when disasters occur: the amount of data that becomes unavailable and needs to be replaced from backups, and the amount of time it might take to replace the data.
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As I mentioned earlier, an instance failure doesn t require data recovery. Similarly, a network failure or an abnormal shutdown of an Oracle background process or a problem caused by an out-of-space condition may lead to temporary disruption of work in the database, but none of these situations call for a data recovery. You need to use data repair techniques only when an error is caused by a media failure or a user error. Let s take a closer look at these two types of critical failures: Media failures: Media failures occur when the database can t read from or write to a file. You could encounter such a media failure because a file was mistakenly deleted, corrupted, or overwritten. Mechanical problems such as head crashes can also cause a disk failure. What happens as a result of a media failure depends on whether you have a duplicate copy of an affected file. For example, if a redo log file is affected, the database will continue operating without a problem if you ve multiplexed the redo log file. If, on the other hand, a datafile error that belongs to the System tablespace encounters errors, the database will shut down immediately. User errors: User errors are errors in data entry or accidental deletion of data or dropping of a table. You can use multiple techniques to undo the effects of a user error. Oracle offers several methods to repair failures resulting from media failures and user errors. Of course, you are always going to keep the appropriate backups of the database, but restoring and recovering backups isn t the only solution available to you. Depending on the type of problem you are dealing with, you can use of one of the following methods to fix the failures: Data Recovery Advisor: The Data Recovery Advisor diagnoses failures, presents repair options, and can execute those options once you approve them. The advisor recommends both manual and automated repair options and can determine the best repair option for you. You can access the Data Recovery Advisor either through the RMAN command line or through the Enterprise Manager. The database automatically detects failures and records them in the Automatic Diagnostic Repository. You can also run a proactive data integrity check or check for block corruption by executing the VALIDATE command. No matter whether the failure you are dealing with was detected through a proactive or a reactive check, using the Data Recovery Advisor should be your first step to repairing persistent failures in your database. Flashback techniques: Oracle Flashback features include features that are useful in viewing past states of data as well as backup- and recovery-related features. Except for the Flashback Drop feature, all the Oracle Flashback features rely on undo data. The main Oracle Flashback features that help you with fixing failures relating to user errors or logical data corruption are as follows: Flashback Database Flashback Table Flashback Drop Flashback Transaction Backout
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