any, will be reported in your alert.log file and in an ARCH
trace file.
Explanation:
============
A stale redo log file is one that Oracle believes might be incomplete for some
background process from writing to a redo log group member. If Oracle cannot
write to a redo log file at any one time, that log file can no longer be
trusted, and Oracle marks it as "STALE". This indicates that the log file
cannot be relied upon to provide all the data written to the log.