The flash recovery area acts as disk cache for tape backups.ġ0.1.1 Using Disk as Cache for Tape Backup If the flash recovery area is configured, Oracle software deletes the files from the flash recovery area on an on-demand basis. For example, if the first log sent from the primary database to the standby is log sequence 100 thread 1, then the backup of archived redo log files whose log sequence is less than 100 must be done on the primary database. If there were any archived redo log files generated before the standby database was started, they must be backed up on the primary database. Only those archived redo log files that were created by the standby instance can be backed up at the standby site. Although some files such as the control file and SPFILE must be backed up on the primary database, the process of backing up datafiles and archived redo log files can be off-loaded to the standby system, to minimize the effect of backups on the production system. In a standby environment, backing up datafiles and archived redo log files taken on the primary or standby system are usable on either system for recovery.
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