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For example, if you configured a flash recovery area and turned on archiving for a database without setting an explicit archivelog location, and then issued the ARCHIVE LOG LIST command, you would see something like this: SQL> ARCHIVE LOG LIST Database log mode Automatic archival Archive destination Oldest online log sequence Next log sequence to archive Current log sequence SQL> Archive Mode Enabled USE_DB_RECOVERY_FILE_DEST 825 827 827
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The USE_DB_RECOVERY_FILE_DEST setting points to the flash recovery area for the database. This is because you configured a flash recovery area and didn t specify a LOG_ARCHIVE_DEST_n destination. Therefore, the LOG_ARCHIVE_DEST_10 destination is implicitly set to the flash recovery area. (You can override this behavior by explicitly setting LOG_ARCHIVE_DEST_10 to an empty string.)
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Setting the Size of the Flash Recovery Area
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Oracle recommends that your flash recovery area should be the same size as the sum of the size of the database, any incremental backups, and every archived redo log. Your flash recovery area must be large enough to accommodate the following: A copy of all datafiles Incremental backups Online redo logs Archived redo logs that haven t been backed up to tape Control files Control file auto-backups You should save both a multiplexed online redo log file and a current control file, in addition to all the other recovery-related files. Since Oracle recommends that you keep at least two copies of the online redo logs and the control file, you can use the flash recovery area to save a pair of redo log and control files. The size of your database is the main factor when setting the size of the flash recovery area. Other factors that affect the size of the flash recovery area are The RMAN backup retention policy The type of storage device for backups (tape and disk or a disk device alone) The number of data block changes in your database
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Ways to Create a Flash Recovery Area
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There are a number of ways you can create a flash recovery area: Configure the flash recovery area at database-creation time using the Database Configuration Assistant (DBCA). Configure two flash recovery area related dynamic initialization parameters. You can create a flash recovery area with these two parameters while the database is running. Use the OEM Database Control to configure a flash recovery area.
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Configuring a Flash Recovery Area
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You use two initialization parameters to configure a flash recovery area: DB_RECOVERY_FILE_DEST_SIZE: This parameter sets the maximum size of the flash recovery area. DB_RECOVERY_FILE_DEST: This parameter points to the location on disk of the flash recovery area. You must locate the flash recovery area on a disk separate from the database area, where you store the active database files such as datafiles, control files, and online redo logs. You have to specify DB_RECOVERY_FILE_DEST_SIZE before you can specify DB_RECOVERY_FILE_DEST. Here s how you would specify the two flash recovery area initialization parameters in your init.ora file: DB_RECOVERY_FILE_DEST_SIZE = 10G DB_RECOVERY_FILE_DEST = '/u01/oradata/rcv_area' Note that the database doesn t allocate the amount of disk space set in DB_RECOVERY_FILE_DEST_ SIZE to the flash recovery area immediately. Oracle will use this space only as the maximum limit on the flash recovery area size. Until new files necessitate the use of more space, the space is controlled by the operating system, although Oracle has assigned it to the flash recovery area.
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Dynamically Defining the Flash Recovery Area
Even if you don t specify a flash recovery area in the init.ora file or the SPFILE, you can use the ALTER SYSTEM statement to configure it while the instance is running. You can create and modify the flash recovery area dynamically using DB_RECOVERY_FILE_DEST and DB_RECOVERY_FILE_DEST_SIZE as follows: SQL> ALTER SYSTEM SET 2* DB_RECOVERY_FILE_DEST_SIZE = 2G; System altered. SQL> ALTER SYSTEM SET 2 DB_RECOVERY_FILE_DEST = '/u01/app/oracle/flashrec_area'; System altered. SQL> As noted earlier, you must set the DB_RECOVERY_FILE_DEST_SIZE parameter first, before you set DB_RECOVERY_FILE_DEST. Ensure that you have created the flash recovery area directory before you use DB_RECOVERY_FILE_DEST. The SCOPE=BOTH clause makes sure that the changes you made are written permanently to the SPFILE. Use the ALTER SYSTEM command to make any changes to the flash recovery area after you create it.
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