You configured the Flash Recovery Area for your database. The database instance has been started
in ARCHIVELOG mode and the LOG_ARCHIVE_DEST_1 parameter is not set.
What will be the implications on the archiving and the location of archive redo log files?
A.Archiving will be disabled because the destination for the redo log files is missing.
B.The database instance will shut down and the error details will be logged in the alert log file.
C.Archiving will be enabled and the destination for the archived redo log file will be set to the Flash Recovery Area implicitly.
D.Archiving will be enabled and the location for the archive redo log file will be created in the default location $ORACLE_HOME/log.
如果打开归档，并且没有指定归档路径的话，那么默认就是在闪回恢复区
原文：http://www.cnblogs.com/Babylon/p/8004646.html