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Archiver – ARCn...
Copies online redo log to archive log
- Archive logs used for media (disk) recovery
Optional process, but critical
Database will hang if ARCHIVELOG mode is set and ARCn is not started
Start with LOG_ARCHIVE_START=TRUE
Notes:
The archiver process (ARCn) copies an online redo log to one or more archive locations. This occurs when the online log is inactive - i.e. another online log is currently in use.
ARCn is an optional process; however, if the database is in ARCHIVELOG mode – it should be if you want to be able to recover – the database will hang if it is not started. This is because in this mode Oracle will not overwrite (destroy) a log if it has not been archived. Without ARCn running in the background, there is no process to do the archiving.
Start the archiver with the LOG_ARCHIVE_START=TRUE parameter in your database parameter file.