Introduction to Oracle archive log (ARCH/ARCn) Processes

Oracle archive log (ARCH/ARCn) process overview in Oracle optional background processes, the most important is the archiving log process.
If data files in the Oracle database are lost or damaged, full recovery should be performed in archive mode. In Oracle, redo log files are divided into multiple groups. When a set of redo log files are fully written, write a group, called Log switching.

Log switching is performed cyclically. When the last group is full, write the first group again. Www.2cto.com if Oracle runs in non-archive mode, the log file overwrites will occur. In archive mode, ARCn will copy the redo log file after switching to the archive log file. Oracle ensures that the redo log files of this group are not overwritten before the archiving of a group of redo logs is complete. Author LiJIaming