Multiplexing redo log files means several copy of
the same log files are kept in different locations
which will be simultaneously updated at any point
of time. But archiving is something different ....
Archiving redo log files is u are keeping track of the permanent changes done in the database into some
files. The redo log files will be overwritten when
check point arrives. But archived files are not
overwritten and they can be used for database
recovery if the database crashes.
There are none so blind as those, who will not see